Relevant bibliographies by topics / Lumbar lordosis

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Academic literature on the topic 'Lumbar lordosis'

Author: Grafiati
Published: 4 June 2021
Last updated: 28 January 2023

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Journal articles on the topic "Lumbar lordosis"

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Uribe, Juan S., Donald A. Smith, Elias Dakwar, Ali A. Baaj, Gregory M. Mundis, Alexander W. L. Turner, G. Bryan Cornwall, and Behrooz A. Akbarnia. "Lordosis restoration after anterior longitudinal ligament release and placement of lateral hyperlordotic interbody cages during the minimally invasive lateral transpsoas approach: a radiographic study in cadavers." Journal of Neurosurgery: Spine 17, no. 5 (November 2012): 476–85. http://dx.doi.org/10.3171/2012.8.spine111121.

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Object In the surgical treatment of spinal deformities, the importance of restoring lumbar lordosis is well recognized. Smith-Petersen osteotomies (SPOs) yield approximately 10° of lordosis per level, whereas pedicle subtraction osteotomies result in as much as 30° increased lumbar lordosis. Recently, selective release of the anterior longitudinal ligament (ALL) and placement of lordotic interbody grafts using the minimally invasive lateral retroperitoneal transpsoas approach (XLIF) has been performed as an attempt to increase lumbar lordosis while avoiding the morbidity of osteotomy. The objective of the present study was to measure the effect of the selective release of the ALL and varying degrees of lordotic implants placed using the XLIF approach on segmental lumbar lordosis in cadaveric specimens between L-1 and L-5. Methods Nine adult fresh-frozen cadaveric specimens were placed in the lateral decubitus position. Lateral radiographs were obtained at baseline and after 4 interventions at each level as follows: 1) placement of a standard 10° lordotic cage, 2) ALL release and placement of a 10° lordotic cage, 3) ALL release and placement of a 20° lordotic cage, and 4) ALL release and placement of a 30° lordotic cage. All four cages were implanted sequentially at each interbody level between L-1 and L-5. Before and after each intervention, segmental lumbar lordosis was measured in all specimens at each interbody level between L-1 and L-5 using the Cobb method on lateral radiography. Results The mean baseline segmental lordotic angles at L1–2, L2–3, L3–4, and L4–5 were –3.8°, 3.8°, 7.8°, and 22.6°, respectively. The mean lumbar lordosis was 29.4°. Compared with baseline, the mean postimplantation increase in segmental lordosis in all levels combined was 0.9° in Intervention 1 (10° cage without ALL release); 4.1° in Intervention 2 (ALL release with 10° cage); 9.5° in Intervention 3 (ALL release with 20° cage); and 11.6° in Intervention 4 (ALL release with 30° cage). Foraminal height in the same sequence of conditions increased by 6.3%, 4.6%, 8.8% and 10.4%, respectively, while central disc height increased by 16.1%, 22.3%, 52.0% and 66.7%, respectively. Following ALL release and placement of lordotic cages at all 4 lumbar levels, the average global lumbar lordosis increase from preoperative lordosis was 3.2° using 10° cages, 12.0° using 20° cages, and 20.3° using 30° cages. Global lumbar lordosis with the cages at 4 levels exhibited a negative correlation with preoperative global lordosis (10°, R = −0.756; 20°, −0.730; and 30°, R = −0.437). Conclusions Combined ALL release and placement of increasingly lordotic lateral interbody cages leads to progressive gains in segmental lordosis in the lumbar spine. Mean global lumbar lordosis similarly increased with increasingly lordotic cages, although the effect with a single cage could not be evaluated. Greater global lordosis was achieved with smaller preoperative lordosis. The mean maximum increase in segmental lordosis of 11.6° followed ALL release and placement of the 30° cage.
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Lee, Ji-Ho, Dong-Oh Lee, Jae Hyup Lee, and Hee Jong Shim. "Effects of Lordotic Angle of a Cage on Sagittal Alignment and Clinical Outcome in One Level Posterior Lumbar Interbody Fusion with Pedicle Screw Fixation." BioMed Research International 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/523728.

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This study aims to assess the differences in the radiological and clinical results depending on the lordotic angles of the cage in posterior lumbar interbody fusion (PLIF). We reviewed 185 segments which underwent PLIF using two different lordotic angles of 4° and 8° of a polyetheretherketone (PEEK) cage. The segmental lordosis and total lumbar lordosis of the 4° and 8° cage groups were compared preoperatively, as well as on the first postoperative day, 6th and 12th months postoperatively. Clinical assessment was performed using the ODI and the VAS of low back pain. The pre- and immediate postoperative segmental lordosis angles were 12.9° and 12.6° in the 4° group and 12° and 12.0° in the 8° group. Both groups exhibited no significant different segmental lordosis angle and total lumbar lordosis over period and time. However, the total lumbar lordosis significantly increased from six months postoperatively compared with the immediate postoperative day in the 8° group. The ODI and the VAS in both groups had no differences. Cages with different lordotic angles of 4° and 8° showed insignificant results clinically and radiologically in short-level PLIF surgery. Clinical improvements and sagittal alignment recovery were significantly observed in both groups.
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Been, Ella, and Leonid Kalichman. "Lumbar lordosis." Spine Journal 14, no. 1 (January 2014): 87–97. http://dx.doi.org/10.1016/j.spinee.2013.07.464.

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Lord, Michael J., John M. Small, Jocylane M. Dinsay, and Robert G. Watkins. "Lumbar Lordosis." Spine 22, no. 21 (November 1997): 2571–74. http://dx.doi.org/10.1097/00007632-199711010-00020.

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Dimitrijević, Vanja, Tijana Šćepanović, Vukadin Milankov, Miroslav Milankov, and Patrik Drid. "Effects of Corrective Exercises on Lumbar Lordotic Angle Correction: A Systematic Review and Meta-Analysis." International Journal of Environmental Research and Public Health 19, no. 8 (April 18, 2022): 4906. http://dx.doi.org/10.3390/ijerph19084906.

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Lumbar lordosis is one of the most important parts of the spine, which is of special importance due to its unique position and direct contact with the pelvis. The aim of this study was to combine the results of several studies and to evaluate the magnitude of the effect of different Lumbar lordotic angle correction programs through meta-analysis. This study has been developed in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) Statement. Four databases were searched for articles collection: PubMed, Cochrane Library, Web of Science, and Google Scholar. The key search terms were: “Lumbar Lordotic angle”, “Lordosis”, “Hyperlordosis”, “Corrective exercise”, and “Low back pain. “The articles included in our study were limited to original articles written only in English that met the following inclusion criteria: (1) participants with lumbar lordosis or hyperlordosis or low back pain; (2) different programs of corrective exercises were applied; (3) Lumbar lordotic angle used as outcome measures. Ten studies are included in our systematic review and meta-analysis. The effect size for the Lumbar lordotic angle outcome was (SMD = 0.550, p ˂ 0.001, moderate effect size). Subgroup analysis for Lumbar lordotic angle: Subgroup Younger group (SMD = 0.640, p ˂ 0.001), Subgroup Older group, (SMD = 0.520, p ˂ 0.001). Subgroup Treatment (SMD = 0.527, p ˂ 0.001), Subgroup No treatment (SMD = 0.577, p = 0.002). This was the only outcome assessed in our analysis. The current meta-analysis indicates that different correction methods have a positive effect on subjects with lumbar lordosis or hyperlordosis. In the following research, we should try to determine which corrective methods have the best effects.
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Sparrey, Carolyn J., Jeannie F. Bailey, Michael Safaee, Aaron J. Clark, Virginie Lafage, Frank Schwab, Justin S. Smith, and Christopher P. Ames. "Etiology of lumbar lordosis and its pathophysiology: a review of the evolution of lumbar lordosis, and the mechanics and biology of lumbar degeneration." Neurosurgical Focus 36, no. 5 (May 2014): E1. http://dx.doi.org/10.3171/2014.1.focus13551.

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The goal of this review is to discuss the mechanisms of postural degeneration, particularly the loss of lumbar lordosis commonly observed in the elderly in the context of evolution, mechanical, and biological studies of the human spine and to synthesize recent research findings to clinical management of postural malalignment. Lumbar lordosis is unique to the human spine and is necessary to facilitate our upright posture. However, decreased lumbar lordosis and increased thoracic kyphosis are hallmarks of an aging human spinal column. The unique upright posture and lordotic lumbar curvature of the human spine suggest that an understanding of the evolution of the human spinal column, and the unique anatomical features that support lumbar lordosis may provide insight into spine health and degeneration. Considering evolution of the skeleton in isolation from other scientific studies provides a limited picture for clinicians. The evolution and development of human lumbar lordosis highlight the interdependence of pelvic structure and lumbar lordosis. Studies of fossils of human lineage demonstrate a convergence on the degree of lumbar lordosis and the number of lumbar vertebrae in modern Homo sapiens. Evolution and spine mechanics research show that lumbar lordosis is dictated by pelvic incidence, spinal musculature, vertebral wedging, and disc health. The evolution, mechanics, and biology research all point to the importance of spinal posture and flexibility in supporting optimal health. However, surgical management of postural deformity has focused on restoring posture at the expense of flexibility. It is possible that the need for complex and costly spinal fixation can be eliminated by developing tools for early identification of patients at risk for postural deformities through patient history (genetics, mechanics, and environmental exposure) and tracking postural changes over time.
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Oikonomidis, Stavros, Vincent Heck, Sonja Bantle, Max Joseph Scheyerer, Christoph Hofstetter, Stefan Budde, Peer Eysel, and Jan Bredow. "Impact of lordotic cages in the restoration of spinopelvic parameters after dorsal lumbar interbody fusion: a retrospective case control study." International Orthopaedics 44, no. 12 (July 13, 2020): 2665–72. http://dx.doi.org/10.1007/s00264-020-04719-2.

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Abstract Purpose Aim of this study was to compare the reconstruction of radiological sagittal spinopelvic parameters between lordotic (10°) and normal cages (0°) after dorsal lumbar spondylodesis. Methods This retrospective monocentric study included patients who received dorsal lumbar spondylodesis between January 2014 and December 2018. Inclusion criteria were degenerative lumbar diseases and mono- or bi-segmental fusions in the middle and lower lumbar region. Exclusion criteria were long-distance fusions (3 segments and more) and infectious and tumour-related diseases. The sagittal spinopelvine parameters (lumbar lordosis, segmental lordosis, sacral slope, pelvic incidence, and pelvic tilt) were measured pre- and post-operatively by two examiners at two different times. The patients were divided into 2 groups (group 1: lordotic cage, group 2: normal cage). Results One hundred thirty-eight patients (77 female, 61 male) with an average age of 66.6 ± 11.2 years (min.: 26, max.: 90) were included in the study based on the inclusion criteria. Ninety-two patients (66.7%) received 0° cages and 46 (33.3%) lordotic cages (10°). Segmental lordosis was increased by 4.2° on average in group 1 and by 6.5° in group 2 (p = 0.074). Average lumbar lordosis was increased by 2.1° in group 1 and by 0.6° in group 2 (p = 0.378). There was no significant difference in the correction of sagittal spinopelvic parameters. Inter- and inter-class reliability was between 0.887 and 0.956. Conclusion According to the results of our study, no advantages regarding sagittal radiological parameters for the implantation of a lordotic cage could be demonstrated.
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Issa, Tariq Ziad, Yunsoo Lee, Mark J. Lambrechts, Khoa S. Tran, Delano Trenchfield, Sydney Baker, Sebastian Fras, et al. "The impact of cage positioning on lumbar lordosis and disc space restoration following minimally invasive lateral lumbar interbody fusion." Neurosurgical Focus 54, no. 1 (January 2023): E7. http://dx.doi.org/10.3171/2022.10.focus22607.

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OBJECTIVE The objective of this study was to evaluate patient and surgical factors that predict increased overall lumbar lordosis (LL) and segmental lordosis correction following a minimally invasive lateral lumbar interbody fusion (LLIF) procedure. METHODS A retrospective review was conducted of all patients who underwent one- or two-level LLIF. Preoperative, initial postoperative, and 6-month postoperative measurements of LL, segmental lordosis, anterior disc height, and posterior disc height were collected from standing lateral radiographs for each patient. Cage placement was measured utilizing the center point ratio (CPR) on immediate postoperative radiographs. Spearman correlations were used to assess associations between cage lordosis and radiographic parameters. Multivariate linear regression was performed to assess independent predictors of outcomes. RESULTS A total of 106 levels in 78 unique patients were included. Most procedures involved fusion of one level (n = 50, 64.1%), most commonly L3–4 (46.2%). Despite no differences in baseline segmental lordosis, patients with anteriorly or centrally placed cages experienced the greatest segmental lordosis correction immediately (mean anterior 4.81° and central 4.46° vs posterior 2.47°, p = 0.0315) and at 6 months postoperatively, and patients with anteriorly placed cages had greater overall lordosis correction postoperatively (mean 6.30°, p = 0.0338). At the 6-month follow-up, patients with anteriorly placed cages experienced the greatest increase in anterior disc height (mean anterior 6.24 mm vs posterior 3.69 mm, p = 0.0122). Cages placed more posteriorly increased the change in posterior disc height postoperatively (mean posterior 4.91 mm vs anterior 1.80 mm, p = 0.0001) and at 6 months (mean posterior 4.18 mm vs anterior 2.06 mm, p = 0.0255). There were no correlations between cage lordotic angle and outcomes. On multivariate regression, anterior cage placement predicted greater 6-month improvement in segmental lordosis, while posterior placement predicted greater 6-month improvement in posterior disc height. Percutaneous screw placement, cage lordotic angle, and cage height did not independently predict any radiographic outcomes. CONCLUSIONS LLIF procedures reliably improve LL and increase intervertebral disc space. Anterior cage placement improves the lordosis angle greater than posterior placement, which better corrects sagittal alignment, but there is still a significant improvement in lordosis even with a posteriorly placed cage. Posterior cage placement provides greater restoration in posterior disc space height, maximizing indirect decompression, but even the anteriorly placed cages provided indirect decompression. Cage parameters including cage height, lordosis angle, and material do not impact radiographic improvement.
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Ambegaonkar, Jatin P., Amanda M. Caswell, Kristen L. Kenworthy, Nelson Cortes, and Shane V. Caswell. "Lumbar Lordosis in Female Collegiate Dancers and Gymnasts." Medical Problems of Performing Artists 29, no. 4 (December 1, 2014): 189–92. http://dx.doi.org/10.21091/mppa.2014.4039.

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OBJECTIVE: Postural deviations can predispose an individual to increased injury risk. Specifically, lumbar deviations are related to increased low back pain and injury. Dancers and gymnasts are anecdotally suggested to have exaggerated lumbar lordosis and subsequently may be at increased risk of lumbar pathologies. Our objective was to examine lumbar lordosis levels in dancers and gymnasts. METHODS: We examined lumbar lordosis in 47 healthy collegiate females (17 dancers, 29 gymnasts; mean age 20.2 ± 1.6 yrs) using 2-dimensional sagittal plane photographs and the Watson MacDonncha Posture Analysis instrument. Participants’ lordosis levels were cross-tabulated and a Mann-Whitney U-test compared lumbar lordosis between groups (p<0.05). RESULTS: Most participants (89.4%, n=42) exhibited either marked (dancers 50%, n=9; gymnasts 62.1%, n=18; combined 57.4%, n=27) or moderate (dancers 27.8%, n=5; gymnasts 34.5%, n=10; combined 31.9%, n=15) lumbar lordosis deviations. The distribution of lordosis was similar across groups (p=0.22). CONCLUSIONS: Most dancers and gymnasts had moderate or marked lumbar lordosis. The extreme ranges of motion required during dancing and gymnastics may contribute to the participants’ high lumbar lordosis. Instructors should be aware that there may be links between repetitive hyperextension activities and lumbar lordosis levels in dancers and gymnasts. Thus, they should proactively examine lumbar lordosis in their dancers and gymnasts. How much age of training onset, regimens, survivor bias, or other factors influence lumbar lordosis requires study. Longitudinal studies are also needed to determine if lumbar lordosis levels influence lumbar injury incidence in dancers and gymnasts.
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Chernukha, Konstantin V., Richard H. Daffner, and Donald H. Reigel. "Lumbar Lordosis Measurement." Spine 23, no. 1 (January 1998): 74–79. http://dx.doi.org/10.1097/00007632-199801010-00016.

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Dissertations / Theses on the topic "Lumbar lordosis"

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Fox, Maria. "Neandertal Lumbopelvic Anatomy and the Biomechanical Effects of a Reduced Lumbar Lordosis." University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1378109007.

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Damasceno, Luiz Henrique Fonseca. "Avaliação da participação dos corpos vertebrais e discos intervertebrais na composição da lordose lombar." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/17/17142/tde-16032007-190229/.

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Foi avaliada a participação dos corpos vertebrais e discos intervertebrais na lordose lombar e, a contribuição destes nas curvaturas lombares de diferentes magnitudes. Foram avaliadas as radiografias lombares em perfil de 350 adultos assintomáticos (143 homens e 207 mulheres, idade média 29 anos). Foram mensuradas a curvatura lombossacra (L1S1), a curvatura lombolombar (L1L5), a angulação de cada corpo vertebral e cada disco intervertebral por meio de uma variação do método de Cobb. A participação percentual dos corpos vertebrais e dos discos intervertebrais na curvatura lombossacra também foi determinada. Comparações entre os sexos e as faixas etárias foram realizadas. Os indivíduos foram divididos em três subgrupos populacionais, de acordo com a magnitude da lordose lombossacra, de modo a separar os indivíduos pertencentes aos extremos da curva de distribuição. Os componentes da curvatura lombar (corpos vertebrais e discos intervertebrais) foram comparados nestes três subgrupos. A medida da curvatura lombossacra no grupo inicial foi -60,9o (-33o a -89o). Os corpos vertebrais eram cifóticos em L1 (2,15o), tendiam ao neutro em L2 (-0,36o) e eram progressivamente lordóticos de L3 (-1,56o) a L5 (-9,23o). Os discos intervertebrais eram progressivamente lordóticos (variando de -4,99o em L1-L2 a -15,58o em L5-S1). Os corpos vertebrais e discos intervertebrais apresentaram participação progressivamente maior na curvatura lombossacra no sentido crânio-caudal. Os discos intervertebrais participaram com cerca de 80% da curvatura lombossacra, sendo que os elementos mais caudais (corpos vertebrais L4 e L5 e discos intervertebrais L4-L5 e L5-S1) corresponderam a mais de 65% da curvatura lombossacra. Os indivíduos mais velhos apresentaram medidas das curvaturas lombares maiores cerca de 4º em comparação aos indivíduos mais jovens, havendo diferença significante para as medidas dos corpos vertebrais L2 e L5 e o disco intervertebral L3-L4, sendo maiores as medidas nos indivíduos mais velhos. As medidas das curvaturas lombares e dos corpos vertebrais L2 e L4 apresentaram diferença estatisticamente significante entre os sexos, sendo as medidas maiores nos indivíduos do sexo feminino. A curvatura lombossacra apresentou média de -46,9° no subgrupo lordose menor; -61,59° no subgrupo lordose intermediária e; -74,13° no subgrupo lordose maior. A curvatura lombolombar apresentou média de -33,28° no subgrupo lordose menor; -45,34° no subgrupo lordose intermediária e; -56,96° no subgrupo lordose maior. Os corpos vertebrais e os discos intervertebrais apresentaram medidas absolutas menores no subgrupo lordose menor do que as dos subgrupos lordose intermediária e lordose maior, mas a participação dos discos intervertebrais na curvatura lombossacra no subgrupo lordose menor (88%) foi maior que nos subgrupos lordose intermediária (81%) e no subgrupo lordose maior (75%). Complementarmente, os corpos intervertebrais apresentaram maior participação nos subgrupos lordose maior e lordose intermediária. Individualmente, os corpos vertebrais apresentaram maior participação no subgrupo lordose maior, exceto pelo corpo vertebral L5 que apresentou maior participação no subgrupo lordose menor. A maior participação percentual dos discos intervertebrais no subgrupo lordose menor era devida à inclinação cifótica dos corpos vertebrais mais cefálicos (especialmente L1 e L2) no subgrupo lordose menor do que nos demais subgrupos, que, por um efeito compensatório, causava uma maior participação discal nas curvaturas menores. Os demais subgrupos apresentavam os corpos vertebrais cefálicos com inclinação muito mais lordótica do que o observado no subgrupo lordose menor. Concluímos que os discos intervertebrais são os principais responsáveis pela curvatura lombar e que a contribuição dos corpos vertebrais e discos intervertebrais na lordose lombar difere entre indivíduos com curvaturas de diferentes magnitudes. Apesar de ocorrer um aumento gradual do acunhamento lordótico do corpo e disco a cada nível vertebral conforme aumenta a medida da lordose, as vértebras mais cefálicas provocam uma diferença na contribuição percentual entre discos intervertebrais e corpos vertebrais nas curvaturas de tamanhos diferentes.
The vertebral bodies and intervertebral discs participation in lumbar lordosis and their contribution between lumbar curves of different size were studied. 350 lumbar spine radiographs of asymptomatic adults (143 men and 207 women, average age 29 years) were evaluated. Lumbosacral (L1S1) and lumbolumbar (L1L5) curves and the angular inclination of each vertebral boby and intervertebral disc were measured using a Cobb method variant. The percentile participation of each vertebral body and intervertebral disc in the lumbossacal curve was calculated. Sex and age were compared. The subjects were separated in tree subgroups, in acording to lumbosacral curve size. The compounds of lumbar curve (discs and vertebrae) were compared in these tree subgroups. The mean lumbosacral curve was ?60,9º (-33º to ?89º). L1 vertebral body was kyphotic (2,15º), L2 was neutral (-0,36º), and the other ones were progressively lordotic from L3 (-1,56º) to L5 (-9,23º). The intervertebral discs were progressively lordotic from L1-L2 (?4,99º) to L5-S1 (?15,58º). Both vertebrae and discs showed a progressive participation in cephalic-caudal direction. The participation of discs was about 80% of lumbosacral curve, and the caudal elements (L4, L5 vertebrae and L4-L5, L5-S1 discs) contributed far 65% of the curve. The older subjects presented lumbar curves larger than younger 4º average, with significant statistical difference to L2, L5 and L3-L4 measures, with older subjects presenting bigger angular values. There were statistical differences of lumbar curves, L2 and L4 measures between sexes, with females presenting bigger values. The lumbosacral curve presented average -46,9º in minor lordosis subgroup, -64,59º in intermediate lordosis sugbroup, and ?74,13º in major lordosis subgroup. The lumbolumbar curve presented average ?33,28º in minor lordosis subgroup, -45,34º in intermediate lordosis subgroup, and ?56,96º in major lordosis subgroup. The absolut values of vertebrae and discs angles were smaller in minor lordosis subgroup than in major lordosis subgroup, but the intervertebral discs participation of was bigger in minor lordosis subgroup (88%) than intermediate lordosis (81%) and major lordosis (75%) subgroups. Complementarely, the vertebrae had a bigger participation in intermediate and major lordosis subgroups. Individually, the vertebrae presented a larger participation in major lordosis subgroup, excepting L5 that presented bigger participation in minor lordosis subgroup. The discs presented larger participation in minor lordosis subgroup. That is consequence of a more kyphotic inclination of the cephalic vertebrae in minor lordosis subgroup than the other ones, causing a compensating effect, with a larger disc participation in the small curves. The intermediate and major lordosis subgroups had the cephalic vertebrae more lordotic than that of the minor lordosis subgroup. We concluded that the intervertebral discs are the main responsible for the lumbar curve angulation and that the contribution of vertebrae and discs in lumbar curves of different sizes is not equal. In spite of a gradual increase of lordotic wedging while lumbar curve increase, the cephalic vertebrae make the disc and vertebrae participation different between different magnitude lumbar curves.
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Smith, April K. "Aging of the Lumbar Vertebrae Using Known Age and Sex Samples." Digital Archive @ GSU, 2010. http://digitalarchive.gsu.edu/anthro_theses/45.

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The dimensions of the lumbar vertebrae are examined in order to determine if these measurements can be used to predict the age of an individual, and if the lumbar vertebrae exhibit sexual dimorphism. Various statistical techniques were utilized to analyze several dimensions of the lumbar vertebrae. Aging patterns in the lumbar elements are distinct between males and females, and females exhibit compression of the L3 element, which may be related to vertebral wedging. Some dimensions of the lumbar vertebrae are sexually dimorphic.
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Silva, Fabiana Cristina da. "Avaliação de um programa computacional para a medida da lordose lombar." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2005. http://hdl.handle.net/10183/5494.

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Objetivo: métodos antropométricos que quantifiquem as curvas da coluna vertebral e a avaliação postural a fim de realizar investigações epidemiológicas sobre o papel da postura na ocorrência das dores lombares. O propósito do estudo foi avaliar acurácia e reprodutibilidade do Sistema de Avaliação Postural Digitalizado (SAPD) para medir lordose lombar comparando com raio-x. Delineamento: transversal, com amostra consecutiva. Participantes: para medida da acurácia no grupo 1 ( T12,L3,L5) n = 16 e grupo 2 (L1,L3,L5) n= 17. Na reprodutibilidade intra e inter-avaliador n= 80. Principais Medidas: marcadores externos nos processos espinhosos das vértebras T12, L1, L3 e L5. Raio-x de perfil da coluna lombar e foto digital em perfil direito. Medida da lordose lombar no raio-x com métodos de Cobb,Centróide (CLL) e Processos Espinhosos (PE) e com o SAPD. Resultados: grupo 1, correlação entre SAPD e Cobb foi 0,803 (p<0,001), entre SAPD e CLL foi 0,642 (p=0,024), entre SAPD e a medida dos PE a correlação foi 0,917, com R2 = 0,842. No grupo 2, correlação entre SAPD e Cobb foi 0,559 (p=0,020), entre SAPD e CLL de 0,325 (p=0,302), com correlação significativa somente entre SAPD e Cobb. Entre SAPD e PE a correlação foi 0,763, com R2 = 0,583. Para reprodutibilidade interavaliador a correlação foi 0,981 (p < 0,001) e para reprodutibilidade intra-avaliador de 0.978 (p < 0,001) referente às mesmas fotografias. Reprodutibilidade intraavaliador de 0.872 (p < 0.001) e 0.956 (p<0,001) para inter-avaliador referente à fotos diferentes de um mesmo indivíduo com recolocação dos marcadores sobre a pele . Considerações Finais: O SAPD mostrou-se acurado e reprodutível para a medida da lordose lombar.
Aim: Antropometric approaches to estimate postural alignment are important to permit epidemiologic investigations of the role of posture in the development of lumbar back pain.The aim of this study was evaluate the accuracy and reliability of the Digitalizing Posture Evaluation System (DPES) in the measurement of lumbar lordosis compared with radiographic measurement (gold standard). Design: cross-sectional study. Participants: Accuracy study Groups markers of (T12,L3,L5) and markers of (L1,L3,L5) were composed of 16 and 17 patients repectively. The intra and interobserver reliability group was composed of 80 patients. Principal measures: Skin markers were placed on spinous processes of T12 or L1,L3 and L5. Lateral radiographs and photographs were taken in the upright position. Radiographic measurement using Cobb, Centroid (CLL) and Spinous Process methods was compared with DPES. Results: Group 1: Correlation coefficient between DPES and Cobb was 0,803 (p<0,001); between DPES and CLL 0,642 (p<0,001); between DPES and SP 0,917 (p < 0,001) with r² = 0,842. Group 2: correlation coefficient was 0,559 (p=0,020) between SP and Cobb; 0,325 (p=0,302) between SP and CLL; and 0,763 between SP and DPES.The reliability coefficients were 0,981 (p<0,001) for interobserver and 0,978 (p<0,001) for intraobserver measurement of the same photographs. Comparing diferent photographs, the reliability was 0,956 (p<0,001) for interobserver and 0,872 (p< 0,001) for intraobserver evaluations. Conclusion: The DPES method correlated well with radiographic measurement of lumbar lordosis.
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Nallar, Marín Lucía Nicole. "Aporte del Método Pilates suelo clásico en la estabilización del centro del cuerpo en estudiantes con hiperlordosis lumbar de la carrera de danza de la Universidad de Chile." Tesis, Universidad de Chile, 2013. http://repositorio.uchile.cl/handle/2250/136754.

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Profesor especializado en danza
La formulación de este trabajo está orientada hacia los estudiantes de la Etapa Básica y el Primer año Superior de la carrera de Licenciatura en Artes con mención en Danza de la Facultad de Artes de la Universidad de Chile y se contextualiza primeramente en una breve descripción de los aspectos necesarios para entender el tema en cuestión, referente a la anatomía de la postura humana y sus desequilibrios. Éstos se fundamentan en los estudios de anatomía y fisiología del cuerpo humano y enfatizan en las estructuras óseas y musculares en donde se localiza el problema postural de la hiperlordosis lumbar, como son la columna vertebral y la pelvis. De igual manera, define los componentes del centro de energía y la forma de trabajarlo en Pilates, paralelo a un enfoque específico de la danza Contemporánea referente al sistema de trabajo Laban-Bartenieff, el cual no es aplicado directamente en todas las asignaturas de la Licenciatura, sin embargo muchas utilizan conceptos y conexiones aplicadas a la postura y el movimiento. En conjunto con las entrevistas y observaciones y de acuerdo a las competencias requeridas en los primeros años de estudio de la carrera de Danza versus las condiciones y habilidades de cada estudiante con respecto a su condición de hiperlordosis lumbar, se realizó una propuesta de ejercicios a modo de programa. Éste se origina en la aplicación del trabajo de Suelo del Método Pilates Clásico o Auténtico, el cual incluye rutinas específicas que les permitirán a los estudiantes localizar el centro de energía para entregar soporte desde él a todo el resto del cuerpo, mejorando su conciencia corporal y optimizando su alineación postural, por tanto, la eficiencia energética y la mecánica corporal.
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Munoz, Fabien. "Evaluation biomécanique des orthèses lombaires : application à l'orthèse Lordactiv®." Phd thesis, Université Jean Monnet - Saint-Etienne, 2013. http://tel.archives-ouvertes.fr/tel-00994583.

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Bien que les orthèses lombaires (OL) soient couramment employées depuis de nombreuses années dans le traitement conservateur des lombalgies, leurs effets mécaniques et posturaux restent, à notre connaissance, partiellement inexplorés. Des obstacles d'ordre méthodologique en sont la principale cause avec en premier lieu la difficulté d'évaluer les effets des OL à l'intérieur du tronc sans être invasif et sans nécessiter un équipement coûteux difficilement utilisable lors de la pratique médicale courante. La levée de ces verrous scientifiques a guidé l'ensemble de ce travail doctoral à travers le développement d'une méthodologie spécifique. L'effet mécanique a été étudié à partir d'une nouvelle méthode non-invasive de mesure de la pression intradiscale réalisée à partir d'une modélisation par éléments finis contrôlée par radiographie. Les premiers résultats ont démontré la possibilité de diminuer de 15 à 22% en moyenne la pression intradiscale lors du port d'une OL modifiant la statique rachidienne. Les différents travaux sur l'équilibre postural ont permis de définir une méthodologie d'analyse de la posture en station debout puis assise adaptée à l'évaluation des OL. Les premiers résultats chez des patients lombalgiques subaiguës ont mis en évidence un contrôle postural plus efficient (réduction de la raideur active du tronc) lors du port de l'OL la plus rigide. A terme, cette méthodologie facile à mettre en œuvre permettra d'adapter les caractéristiques du produit (raideur passive / forme) aux caractéristiques des patients (raideur active / courbure lombaire) dans le but d'optimiser l'efficacité clinique
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Chávez, Téllez Girón Guadalupe Patricia, and Ayala Adriana Plata. "Factores relacionados con la frecuencia de hiper-cifosis dorsal e hiper-lordosis lumbar en el personal de oficina de la empresa RH Maq SA de CV 2013." Tesis de Licenciatura, Medicina-Quimica, 2014. http://ri.uaemex.mx/handle/123456789/14833.

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CHEN, CHI-HSIEN, and 陳祺賢. "Measurement of lumbar spinal motion, lumber lordosis and surface contour of back with photometric stereo method." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/26308043272102226660.

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Chun, Chen Chung, and 陳仲鈞. "Influence of Pilot's Lumbar Lordosis on the Sustainability for Ejection Impact." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/89782799832134683071.

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碩士
義守大學
工業管理學系
90
In order to understand the influences of pilot’s lumbar lordosis on the sustainability for ejection impact, this study measured the characteristic angles of lumbar lordosis from 112(?) helicopter crews of the ROC Army. Two lumbar lordotic angles were measured: the first measure was between L1 and L5 (LLAΙ); the second one was between L2 and L5 (LLAⅡ). The mean values of LLAΙand LLAⅡ were 31.42 ± 10.11 o and 34.16 ± 9.39 o , respectively. Besides, the lumbosacral angle and sacral inclination angle were 14.05 ± 5.84 o and 42.58 ± 9.15 o, respectively. No significant difference was noted in lumbar lordotic angle (LLAΙ) between helicopter crews and normal adults, but there was a statistically significant difference between helicopter crews and western normal males (LLAⅡ). This study also designed a lumbar model with variable lordosis for a 50 %ile dummy, and used it to be the subject in ejection experiments. The results of the ejection experiment showed that the acceleration for the lumbar with normal lordosis was smaller than the more lordotic or straight lumbar. The results also revealed that increasing of the abdominal pressure had a potential to decrease the loads on the lumbar spine. In addition to ejection experiments, this study also established a finite element spine model to simulate a thoraco-lumbar spine under ejection impacts. The results of FE simulation showed that both of a larger lorditic angle and a higher ejecting onset rate increased the stress distributed on lumbar spine. To summarize the results of experiments and simulation may conclude that the lumbar lordosis will moderately vary the lumbar loading during sustaining ejection impact, and further studies are needed to benefit the pilot’s safety.
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Dallas, Lauren Kyle. "The importance of correcting the lumbar lordosis in the treatment of cervicogenic headaches resulting from anterior head carriage." Thesis, 2009. http://hdl.handle.net/10210/2659.

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Books on the topic "Lumbar lordosis"

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Harrison, Deed E. CBP structural rehabilitation of the lumbar spine. [Evanston, Wyo.]: Harrison CBP Seminars, 2008.

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Berven, Sigurd H., and Praveen V. Mummaneni. Degenerative Spinal Deformity: Creating Lordosis in the Lumbar Spine, an Issue of Neurosurgery Clinics of North America. Elsevier - Health Sciences Division, 2018.

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Newsome, Scott D. Other Proven and Putative Autoimmune Disorders of the CNS. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780199937837.003.0092.

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Antiglutamic acid decarboxylase (GAD)-associated disorders are a group of rare neuroimmunological disorders that encompass an expanding spectrum of neurological syndromes. The pathophysiology of these disorders is not well understood, although the presence of very high levels of antibodies to GAD is indicative of immunological dysfunction. The most well-known disease within this class of disorders is stiff-person syndrome (SPS), which often manifests as painful spasms, stiffness/rigidity in axial and limb musculature, and increased lumbar lordosis. Other anti-GAD-associated disorders include isolated cerebellar ataxia, progressive encephalopathy with rigidity and myoclonus (PERM), and encephalitis. Treatment depends on the severity of disease, ranging from symptomatic to immunomodulating/immunosuppressant therapies.
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Book chapters on the topic "Lumbar lordosis"

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Steib, Jean-Paul, and Yann Philippe Charles. "How to Obtain the Best Lumbar Lordosis." In Advanced Concepts in Lumbar Degenerative Disk Disease, 321–29. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-47756-4_24.

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Hwang, S. H., S. W. Park, and Y. H. Kim. "Measurement Comparison about Lumbar Lordosis : Radiography and 3D Motion Capture." In IFMBE Proceedings, 1669–71. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03882-2_442.

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van Empelen, R. "Een driejarig meisje met een versterkte lumbale lordose." In Fysiotherapeutische casuïstiek, 663–65. Houten: Bohn Stafleu van Loghum, 2006. http://dx.doi.org/10.1007/978-90-313-8645-1_110.

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"Lumbar Lordosis." In Encyclopedia of Pain, 1751. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-28753-4_201196.

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Mosley, Yusef I., and James S. Harrop. "Flat Back Deformity." In Spinal Neurosurgery, 215–24. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780190887773.003.0023.

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Flat back syndrome is a phenomenon that occurs when the patient has loss of lumbar lordosis, which can lead to pelvic incidence (PI) and lumbar lordosis (LL) mismatch. Patients can develop this syndrome after a prior lumbar fusion or develop loss of LL secondary to degenerative changes in the spine. This chapter discusses a case presentation of a patient who has developed flat back syndrome after undergoing a prior lumbar fusion. At the end of the presentation, the reader should be able to identify physical exam findings, order the appropriate imaging to evaluate the spinal malalignment, discuss the goals of surgery, and anticipate management complications associated with the surgery.
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"6 Spinal Curves Segmentation and Lumbar Lordosis Classification." In Sagittal Balance of the Spine, edited by Pierre Roussouly, João Luiz Pinheiro-Franco, Hubert Labelle, and Martin Gehrchen. Stuttgart: Georg Thieme Verlag, 2019. http://dx.doi.org/10.1055/b-0039-171402.

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"41 Hook Patterns for the Preservation of Lumbar Lordosis." In Surgical Techniques for the Spine, edited by Thomas R. Haher and Andrew A. Merola. Stuttgart: Georg Thieme Verlag, 2003. http://dx.doi.org/10.1055/b-0034-48861.

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A. Oakley, Paul, Ibrahim M. Moustafa, and Deed E. Harrison. "Restoration of Cervical and Lumbar Lordosis: CBP® Methods Overview." In Spinal Deformities in Adolescents, Adults and Older Adults [Working Title]. IntechOpen, 2019. http://dx.doi.org/10.5772/intechopen.90713.

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Guy, A., H. Labelle, S. Barchi, and CÉ Aubin. "The impact of immediate in-brace 3D corrections on curve evolution after two years of treatment: preliminary results." In Studies in Health Technology and Informatics. IOS Press, 2021. http://dx.doi.org/10.3233/shti210459.

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For the brace treatment of adolescent idiopathic scoliosis (AIS), in-brace correction and brace-wear compliance are well-documented parameters associated with a greater chance of treatment success. However, the number of studies on the impact of sagittal and transverse correction on curve evolution in the context of bracing is limited. The objective of this work was to evaluate how immediate inbrace correction in the three anatomical planes is related to long-term curve evolution after two years of bracing. We performed a retrospective analysis on 94 AIS patients followed for a minimum of two years. We analyzed correlations between in-brace correction and two-year out-of-brace evolution for Cobb and apical axial rotations (ARs) in the medial thoracic and thoraco-lumbar/lumbar regions (MT & TL/L). We also studied the association between the braces’ kyphosing and lordosing effect and the evolution of thoracic kyphosis (TK) and lumbar lordosis (LL) after two years. Finally, we separated the patients into three groups based on their curve progression results after two years (corrected, stable and progressed) and compared the 3D in-brace corrections and compliance for each group. Coefficients were statistically significant for all correlations. They were weak for Cobb angles (MT: -0.242; TL/L: -0.275), low for ARs (MT: -0.423; TL/L: -0.417) and moderate for sagittal curves (TK: 0.549; LL: 0.482). In-brace coronal correction was significantly higher in corrected vs stable patients (p=0.004) while compliance was significantly higher in stable vs progressed patients (p=0.026). This study highlights the importance of initial in-brace correction in all three planes for successful treatment outcomes.
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Sweeney, Kieron, Catherine Moran, and Ciaran Bolger. "Thoracic spinal disease." In Oxford Textbook of Neurological Surgery, edited by Ramez W. Kirollos, Adel Helmy, Simon Thomson, and Peter J. A. Hutchinson, 711–18. Oxford University Press, 2019. http://dx.doi.org/10.1093/med/9780198746706.003.0061.

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The thoracic spine occupies a unique position with respect to anatomical, biomechanical, pathological, and surgical considerations. The kyphosis of the thoracic spine is offset by the lordosis in the mobile cervical spine and the principal load bearing lumbar spine maintaining a sagittal balanced posture. Due to the biomechanical properties of the thoracic spine, the incidence of thoracic disc prolapse is low. However, the anatomical features of the thoracic spine make appropriate surgical planning imperative. This chapter will cover the management and operative approaches to thoracic disc disease, including open and minimally invasive techniques. Operative approaches can be broadly divided into two groups, anterior and posterior-lateral. Each approach is discussed with respect to technique, anatomy, closure, and common complications. It will also discuss pathogenesis, diagnosis, and management of osteoporotic fractures.
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Conference papers on the topic "Lumbar lordosis"

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Martin, Audrey, Connor Telles, Jeremi Leasure, Jessica Tang, Christopher Ames, and Dimitriy Kondrashov. "Demands on Posterior Fusion Hardware During Lordosis Restoration Procedures." In ASME 2013 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/sbc2013-14195.

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Lower lumbar lordosis plays a critical role in sagittal alignment. It has been shown that restoration of lumbar lordosis in patients with preoperative sagittal imbalance is necessary to prevent postoperative sagittal decompensation [1]. Further, restoration of lower lumbar lordosis in patients with degenerative flatback syndrome has been shown clinically to result in additional correction of the thoracic curve and sacral slope [2]. Currently, there are three commonly used intraoperative techniques to restore lumbar lordosis: (1) cantilever bending, (2) in situ bending, and (3) compression and/or distraction of screws along posterior fusion rods. Although powerful, all three techniques require the surgeon to impart large forces to the accompanying posterior fusion hardware, often causing failure of hardware and inconsistency to achieve pre-operatively planned lordosis. To date, there has been no clinical or biomechanical study to address the comparative performance of these three techniques. In efforts to determine a standard of care for sagittal alignment via lumbar lordosis restoration, the goal of this study is to establish a relation between the three techniques, and the resulting demands on posterior fusion hardware. It is hypothesized that greater loads will be observed in the hardware during in situ bending, increasing the risk of pedicle screw pullout.
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Alland, J. A., A. A. Espinoza Orías, H. S. An, G. B. J. Andersson, and N. Inoue. "Three-Dimensional Characterization of Lumbar Lordosis in Torsion." In ASME 2011 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2011. http://dx.doi.org/10.1115/sbc2011-53742.

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The curvature of the lumbar spine has been extensively studied, mostly in relation to scoliosis.1 Previous three-dimensional models of scoliosis allowed for the characterization of specific abnormalities in the sagittal, coronal and axial planes. Recent research has shown that these same spinal structure abnormalities (including facet joint orientation) may also be associated with spondylolisthesis,2 aging, and the onset of lower back pain, among other potential etiologies.3 Newer imaging technologies allow for more precise determination of the spinal curvature4 with all of these studies typically carried out in the neutral position (standing or supine). To the best of the author’s knowledge, there is no study of the behavior of the spinal curvature with axial torsion in vivo. We hypothesized that the spinal curvature when experiencing torsion will deviate significantly from the neutral position due to the complex coupled motions in the spine. The objective of this study is to characterize in vivo the change in lumbar segmental lordosis of the asymptomatic spine during torsion.
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Shirazi-Adl, A., and M. Parnianpour. "Analysis of the Lumbar Spine in Heavy Liftings: Slight Flattening in Lordosis Decreases Risk of Tissue Injury." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0090.

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Abstract During various recreational/occupational daily activities, the sagittal curvature of the human lumbar spine (ie, lordosis) changes, influencing mechanics of the entire human spine. It affects the distribution of gravity/external loads among passive and active systems thus altering the load transmission in the structure. Due to the well-recognised role of lifting in industrial low-back injuries, the lumbar posture has attracted attention in a search for the safest lifting methods. Attempts to recommend optimal lifting techniques have not yielded satisfactory results due to many controversies surrounding the issue and lack of reliable models/measurements. Although the squat lift (whenever possible) is generally considered as a safer lift than the stoop lift in bringing the load closer to the body, the advantages in maintaining lordosis during lifting tasks, in general, is less understood. Such changes impose different external loads and internal strains/stresses in the lumbar spine tissues and as such influence the risk of injury and low-back pain. In a recent study, Cholewicki and McGill [1] observed that the experienced power lifters performed their lifts with relatively small lumbar flexion angles, much smaller than their respective maximum values during voluntary forward bending. The current study aims to investigate the detailed response of the entire lumbar spine (eg, tissue stresses) under large compression loads while the posture is altered, ie, the initial lordosis of ∼46° flattens by up to 38° (ie, flexion) or increases by up to 15° (ie, extension).
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Shirazi-Adl, A., and M. Parnianpour. "How Is the Lumbar Spine Stabilized in Compression? Model Studies on Effect of Various Loading Configurations." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0089.

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Abstract The passive human lumbar spine exhibits instability (ie, hypermobility) under compression loads of less than 100N [1,2] which is only a small fraction of loads experienced during various recreational/occupational daily activities. The issue of the spinal stability under compression loads has been the focus of a number of studies [3–7]. The observation of changes in the posture (ie, pelvic tilt, lordosis) during loading/micro-gravity and in low-back population along with that of negligible muscle activities in erect postures with/without loads in hands suggest that the spinal posture is so adjusted as to stabilise the passive system with minimal muscle activation. In search of such plausible mechanisms, this work investigates the effect of alterations in load configurations and lumbar lordosis on the equilibrium/stability of the lumbar spine in moderate/large axial loads. Using a detailed nonlinear finite element model of the lumbar spine, the influence of sagittal/lateral moments on the equilibrium response in axial compression up to 2800N applied at the @L1 alone or distributed among lumbar vertebrae is studied for different lumbar curvatures. The effects of the application of the compression as a follower load on the L1 alone or L1-L5 vertebrae and a novel wrapping compression load that passes through the vertebral centres on the equilibrium/stability response is subsequently investigated using a simplified nonlinear beam model of the lumbar spine.
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Divya K., Veena, Devanshu Mukherjee, Vidhya Shree, Somali Roy, Venkat Raghavan, P. M. Rajasree, Deepashree Devaraj, C. H. Renumadhavi, Vasanth Raj. Lakshman, and K. N. Subramanya. "A Novel Approach towards Early Detection of Obliteration in Lumbar Lordosis." In 2020 42nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) in conjunction with the 43rd Annual Conference of the Canadian Medical and Biological Engineering Society. IEEE, 2020. http://dx.doi.org/10.1109/embc44109.2020.9176048.

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Evcik, D., and A. Yücel. "FRI0241 Lumbar lordosis in acute and chronic low back pain patients." In Annual European Congress of Rheumatology, Annals of the rheumatic diseases ARD July 2001. BMJ Publishing Group Ltd and European League Against Rheumatism, 2001. http://dx.doi.org/10.1136/annrheumdis-2001.545.

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Naserkhaki, Sadegh, Jacob L. Jaremko, Greg Kawchuk, Samer Adeeb, and Marwan El-Rich. "Investigation of Lumbosacral Spine Anatomical Variation Effect on Load-Partitioning Under Follower Load Using Geometrically Personalized Finite Element Model." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-40231.

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The spinal load sharing and mechanical stresses developed in the spine segments due to mechanical loads are dependent on the unique spinal anatomy (geometry and posture). Variation in spinal curvature alters the load sharing of the lumbar spine as well as the stiffness and stability of the passive tissues. In this paper, effects of lumbar spine curvature variation on spinal load sharing under compressive Follower Load (FL) are investigated numerically. 3D nonlinear Finite Element (FE) models of three ligamentous lumbosacral spines are developed based on personalized geometries; hypo-lordotic (Hypo-L), normal (Normal-L) and hyper-lordotic (Hyper-L) cases. Analysis of each model is performed under Follower Load and developed stress in the discs and forces in the collagen fibers are investigated. Stresses on the discs vary in magnitude and distribution depending on the degree of lordosis. A straight hypo-lordotic spine shows stresses more equally distributed among discs while a highly curved hyper-lordotic spine has stresses concentrated at lower discs. Stresses are uniformly distributed in each disc for Hypo-L case while they are concentrated posteriorly for Hyper-L case. Also, the maximum force in collagen fibers is developed in the Hyper-L case. These differences might be clinically significant related to back pain.
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Shirazi-Adl, A., S. Sadouk, and M. Parnianpour. "Effect of Pelvic Tilt and Lordosis on Passive-Active Synergy in Lumbar Spine Under Axial Compression." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0477.

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Abstract The coupled load sharing-posture response of the human lumbar spine under relatively large compression loads with and without sagittal rotations remains yet to be adequately understood. Such investigations should account for the observed changes in the pelvic tilt and lumbar lordosis and influences thereof on the passive-active equilibrium and stability of the human spine. In pursuit of these goals, the objectives of the current work, using a nonlinear finite element model of the lumbosacral spine, are set as follows: - Study of the synergy of the active-passive lumbar spine under an axial compression load of 2800 N in quasi-neutral position; - Development of an optimal posture accounting for the postural adaptation of the spine in order to withstand the applied 2800 N load in quasi-neutral posture; and - Evaluation of local lumbar muscle forces in order to maintain the equilibrium of the system in such optimal posture.
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Rundell, S. A., J. Isaza, J. S. Day, S. Guillory, W. N. Newberry, and S. M. Kurtz. "The Importance of Posterior Muscle Strength and Facet Contact in Preventing Lumbar Disc Herniation During Forward Bending." In ASME 2010 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2010. http://dx.doi.org/10.1115/sbc2010-19468.

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During forward bending, a combination of compression, anterior shear, and flexion moment is applied to the lumbar spine due to upper body weight. A combination of posterior muscle and ligament forces must be generated in order to prevent excessive motion and restore upright posture. It is generally believed that forward bending to 90 degrees while maintaining a straight or extended lumbar spine is biomechanically favorable compared to lifting with a rounded back [1]. A simple biomechanical model of the lumbar spine during bending in which the vertical force from upper body weight is balanced with posterior muscle and ligament tension would result in similar levels of compression of the disc regardless of the bending modality. However, this model does not take into consideration the facets. A study involving professional class weightlifters showed that subjects would increase the lordosis in their lumbar spines prior to executing a deadlift maneuver [2]. The authors suggest several possible advantages for why the lifters increased the lordosis including muscle control and geometric advantages, but do not indicate the potential for increased facet engagement. During forward bending the lumbar spine will be exposed to anterior shear forces, which will cause the facets to engage [3]. Posterior muscle activation occurring during facet engagement may generate a fulcrum, which has the potential to reduce the compression experienced by the disc. Therefore, the objective of the current study was to simulate forward bending with a previously validated finite element model of L4-L5 and determine if increasing posterior muscle force results in a reduction in disc pressure. We hypothesized that posterior muscle activation during forward bending would increase facet contact and reduce intradiscal pressure and nucleus extrusion forces thereby minimizing the contribution to progressive disc herniation.
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Shirazi-Adl, A., M. El-Rich, D. Pop, and M. Parnianpour. "Evaluation of Muscle Forces in a Synergistic Lumbar Spine Using Kinematics-Based Approach and Optimization." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/bed-23034.

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Abstract Alternative methods have been proposed to solve the redundant problem of spinal active-passive load distribution. Due to the shortcomings in existing reduction, optimisation and EMG-driven models, and combination thereof, a novel kinematics-based approach is introduced that utilises the spinal passive-active synergy. Our recent studies demonstrate that, for a given task, the posture may be so adjusted as to yield an optimal load configuration requiring minimum muscle exertion [1]. In the current study, a solution technique for the redundant spinal system is described and applied to the analysis of a lumbar spine in an optimal posture obtained by varying the lordosis and pelvic tilt under a total of 2800N compression. The forces in lumbar muscles are subsequently computed for this optimal posture.
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