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Journal articles on the topic 'Moments de flexion des vagues'

Author: Grafiati

Published: 3 November 2023

Last updated: 31 July 2025

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1

Pollard, Jonisha P., William L. Porter, and Mark S. Redfern. "Forces and Moments on the Knee During Kneeling and Squatting." Journal of Applied Biomechanics 27, no. 3 (2011): 233–41. http://dx.doi.org/10.1123/jab.27.3.233.

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Euler angle decomposition and inverse dynamics were used to determine the knee angles and net forces and moments applied to the tibia during kneeling and squatting with and without kneepads for 10 subjects in four postures: squatting (Squat), kneeling on the right knee (One Knee), bilateral kneeling near full flexion (Near Full) and bilateral kneeling near 90° flexion (Near 90). Kneepads affected the knee flexion (p= .002), medial forces (p= .035), and internal rotation moments (p= .006). Squat created loading conditions that had higher varus (p< .001) and resultant moments (p= .027) than k

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Gál, J. M. "Mammalian spinal biomechanics. I. Static and dynamic mechanical properties of intact intervertebral joints." Journal of Experimental Biology 174, no. 1 (1993): 247–80. http://dx.doi.org/10.1242/jeb.174.1.247.

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Four-point bending was used to apply pure extension and flexion moments to the ligamentous lumbosacral spine and pelvic girdle of monkey (Macaca fascicularis), rabbit (domestic and wild, Oryctolagus cuniculus), badger (Meles meles), wallaby (Wallabia rufogrisea frutica), sheep (Ovis aries), seal (Phoca vitulina) and tiger (Panthera tigris). The absolute ranges of angular change in lumbar-lumbar joints (from X-radiographs) were considerable and similar in monkey and wallaby (greater in flexion) and in rabbit and badger (symmetrical in extension and flexion). Mass-specific bending comparisons sh

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Dall, P. M., B. Müller, I. Stallard, J. Edwards, and M. H. Granat. "The functional use of the reciprocal hip mechanism during gait for paraplegic patients walking in the Louisiana State University reciprocating gait orthosis." Prosthetics and Orthotics International 23, no. 2 (1999): 152–62. http://dx.doi.org/10.3109/03093649909071627.

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Reciprocally linked orthoses used for paraplegic walking have some form of linkage between the two hip joints. It has been assumed that flexion of the swinging leg is driven by extension of the stance leg. The aims of this study were to investigate the moments generated around the hip joint by the two cables in a Louisiana State University Reciprocating Gait Orthosis (LSU-RGO). Six (6) subjects were recruited from the Regional Spinal Injuries Centre at Southport, who were experienced RGO users. The cables were fitted with strain gauged transducers to measure cable tension. Foot switches were u

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Gillette, Jason C., Catherine A. Stevermer, Stacey A. Meardon, Timothy R. Derrick, and Charles V. Schwab. "Upper Extremity and Lower Back Moments during Carrying Tasks in Farm Children." Journal of Applied Biomechanics 25, no. 2 (2009): 149–55. http://dx.doi.org/10.1123/jab.25.2.149.

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Farm youth commonly perform animal care tasks such as feeding and watering. The purpose of this study was to determine the effects of age, bucket size, loading symmetry, and amount of load on upper body moments during carrying tasks. Fifty-four male and female participants in four age groups (8–10 years, 12–14 years, 15–17 years, and adults, 20–26 years) participated in the study. Conditions included combinations of large or small bucket sizes, unilateral or bilateral loading, and load levels of 10% or 20% of body weight (BW). During bucket carrying, elbow flexion, shoulder flexion, shoulder a

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Kaur, Mandeep, Daniel Cury Ribeiro, Kate E. Webster, and Gisela Sole. "Association Between Knee Moments During Stair Navigation and Participant-Related Factors in Individuals With Anterior Cruciate Ligament Reconstruction: A Cross-Sectional Study." Journal of Sport Rehabilitation 31, no. 2 (2022): 174–80. http://dx.doi.org/10.1123/jsr.2021-0104.

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Context: Altered knee joint mechanics may be related to quadriceps muscle strength, time since surgery, and sex following anterior cruciate ligament reconstruction (ACLR). The aim of this study was to investigate the association between knee moments, with participant-related factors during stair navigation post-ACLR. Design: Cross-sectional study. Methods: A total of 30 participants (14 women) with ACLR, on average 7.0 (SD 4.4) years postsurgery were tested during stair ascent and descent in a gait laboratory. Motion capture was conducted using a floor-embedded force plate and 11 infrared came

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Andrysek, Jan, Susan Klejman, and John Kooy. "Examination of Knee Joint Moments on the Function of Knee-Ankle-Foot Orthoses During Walking." Journal of Applied Biomechanics 29, no. 4 (2013): 474–80. http://dx.doi.org/10.1123/jab.29.4.474.

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The goal of this study was to investigate clinically relevant biomechanical conditions relating to the setup and alignment of knee-ankle-foot orthoses and the influence of these conditions on knee extension moments and orthotic stance control during gait. Knee moments were collected using an instrumented gait laboratory and concurrently a load transducer embedded at the knee-ankle-foot orthosis knee joint of four individuals with poliomyelitis. We found that knee extension moments were not typically produced in late stance-phase of gait. Adding a dorsiflexion stop at the orthotic ankle signifi

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Weir, Gillian, Jacqueline Alderson, Natalie Smailes, Bruce Elliott, and Cyril Donnelly. "A Reliable Video-based ACL Injury Screening Tool for Female Team Sport Athletes." International Journal of Sports Medicine 40, no. 03 (2019): 191–99. http://dx.doi.org/10.1055/a-0756-9659.

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AbstractThis study aimed to develop a 2-dimensional (2D) video screening tool capable of predicting an athlete’s peak 3-dimensional (3D) knee moments during unplanned sidestepping. 2D video-based kinematic measures were simultaneously captured with 3D peak knee moments for 30 female field hockey players (15 junior, 15 senior). Intra- and intertester repeatability of 2D kinematic measures was performed. Then, linear regression models were used to model 3D knee moments from 2D kinematic variables utilizing 80% of the sample (n=24). Regression equations were then validated on the remaining 20% of

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8

Hoy, M. G., R. F. Zernicke, and J. L. Smith. "Contrasting roles of inertial and muscle moments at knee and ankle during paw-shake response." Journal of Neurophysiology 54, no. 5 (1985): 1282–94. http://dx.doi.org/10.1152/jn.1985.54.5.1282.

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Intralimb kinetics of the paw-shake response (PSR) were studied in four spinal, adult cats. Using rigid body equations of motion to determine the dynamic interactions between limb segments, knee and ankle joint kinetics were calculated for the steady-state cycles as defined in the preceding paper. Hindlimb motion was filmed (200 frames/s) to obtain knee and ankle kinematics. Responses of flexors and extensors at both joints were recorded synchronously with cinefilm. Ankle and knee joint kinematics were determined from 51 steady-state cycles of 16 PSRs. Average maximum displacements, velocities

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Sørensen, Henrik, Dennis B. Nielsen, Julie S. Jacobsen, Kjeld Søballe, and Inger Mechlenburg. "Isokinetic dynamometry and gait analysis reveal different hip joint status in patients with hip dysplasia." HIP International 29, no. 2 (2018): 215–21. http://dx.doi.org/10.1177/1120700018773401.

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Background: Objective assessment of hip dysplasia patients’ functional hip joint status routinely involves gait analysis or isokinetic dynamometry. However, these methods have shown equivocal results and have not been employed in the same groups of patients and controls. Purpose: To assess hip flexor and abductor moments by isokinetic dynamometry in the dysplasia patient and controls, for which we previously reported smaller flexor and slightly larger abductor moments during gait in patients compared to controls. Methods: The study was designed as a prospective cohort study (Level of Evidence

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Lyle, Mark A., Jake C. Jensen, Jennifer L. Hunnicutt, et al. "Identification of strength and spatiotemporal gait parameters associated with knee loading during gait in persons after anterior cruciate ligament reconstruction." Journal of Athletic Training 2021, preprint (2021): 0000. http://dx.doi.org/10.4085/1062-6050-0186.21.

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ABSTRACT Context: Altered knee moments are common during gait in patients following anterior cruciate ligament reconstruction (ACLR). Modifiable factors that influence knee moments and are feasible to record in clinical settings such as strength and spatiotemporal parameters (e.g. step length, step width) have not been identified in persons after ACLR. Objective: The objective was to identify strength and spatiotemporal gait parameters that can predict knee moments in persons after ACLR. Design: Cross-Sectional Study Setting: Laboratory Patients: Twenty-three participants with ACLR (14.4 ± 17.

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Lambach, Rebecca L., Jay W. Young, David C. Flanigan, Robert A. Siston, and Ajit M. W. Chaudhari. "Knee Joint Loading During Lineman-Specific Movements in American Football Players." Journal of Applied Biomechanics 31, no. 3 (2015): 142–48. http://dx.doi.org/10.1123/jab.2014-0123.

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Linemen are at high risk for knee cartilage injuries and osteoarthritis. High-intensity movements from squatting positions (eg, 3-point stance) may produce high joint loads, increasing the risk for cartilage damage. We hypothesized that knee moments and joint reaction forces during lineman-specific activities would be greater than during walking or jogging. Data were collected using standard motion analysis techniques. Fifteen NCAA linemen (mean ± SD: height = 1.86 ± 0.07 m, mass = 121.45 ± 12.78 kg) walked, jogged, and performed 3 unloaded lineman-specific blocking movements from a 3-point st

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Qiu, Tian-Xia, Ee-Chon Teo, and Qing-Hang Zhang. "VALIDATION OF FINITE ELEMENT MODELS OF THORACOLUMBAR T11-T12 AND T12-L1 AND COMPARISON OF THEIR BIOMECHANICAL RESPONSES." Journal of Musculoskeletal Research 09, no. 03 (2005): 133–43. http://dx.doi.org/10.1142/s0218957705001576.

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The objective of this study was to build and validate the FE models of thoracolumbar junctional T11-T12 and T12-L1 functional spinal units (FSUs) and compare the biomechanical responses of the two FSUs under physiological loading modes: flexion, extension, lateral bending and axial rotation. Anatomically accurate FE models of thoracolumbar T11-T12 and T12-L1 FSUs were developed and validated against published experimental results in terms of load displacement responses and range of motion (ROM) under flexion and extension pure moments of 7.5 Nm, left and right lateral bending pure moments of 7

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Herbort, Mirco, Philipp Michel, Michael J. Raschke, et al. "Should the Ipsilateral Hamstrings Be Used for Anterior Cruciate Ligament Reconstruction in the Case of Medial Collateral Ligament Insufficiency? Biomechanical Investigation Regarding Dynamic Stabilization of the Medial Compartment by the Hamstring Muscles." American Journal of Sports Medicine 45, no. 4 (2016): 819–25. http://dx.doi.org/10.1177/0363546516677728.

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Background: Semitendinosus and gracilis muscles are frequently harvested for autologous tendon grafts for cruciate ligament reconstruction. This study investigated the joint-stabilizing effects of these hamstring muscles in cases of insufficiency of the medial collateral ligament (MCL). Hypotheses: First, both the semitendinosus and gracilis muscles can actively stabilize the joint against valgus moments in the MCL-deficient knee. Second, the stabilizing influence of these muscles decreases with an increasing knee flexion angle. Study Design: Controlled laboratory study. Methods: The kinematic

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Andrysek, Jan, Susan Klejman, and John Kooy. "Forces and moments in knee–ankle–foot orthoses while walking on irregular surfaces: A case series study." Prosthetics and Orthotics International 38, no. 2 (2013): 104–13. http://dx.doi.org/10.1177/0309364613489145.

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Background: Kinetic data provide important information about the mobility performance of individuals with lower limb impairments and their assistive devices; however, there is limited understanding of this in real-life environments. Objective: To evaluate the effect of real-life irregular surfaces on forces and moments in knee–ankle–foot orthoses. Methods: In this case series study, a load cell was used to measure the forces and moments at the knee joint of knee–ankle–foot orthoses of individuals with unilateral muscle weakness as a result of poliomyelitis while walking on different ground sur

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Mueske, Nicole, Daniel T. Feifer, Curtis VandenBerg, et al. "EFFECT OF STATIC ANATOMIC ALIGNMENT ON DYNAMIC LIMB VALGUS DURING SIDE-STEP CUTTING IN UNINJURED ADOLESCENT ATHLETES." Orthopaedic Journal of Sports Medicine 7, no. 3_suppl (2019): 2325967119S0002. http://dx.doi.org/10.1177/2325967119s00028.

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BACKGROUND Dynamic limb valgus, combining hip adduction and internal rotation with knee abduction posture and moments, has been implicated in ACL injury. However, the contribution of static lower extremity alignment to dynamic limb valgus is unknown. This study assessed the relationships among lower extremity static alignment and dynamic kinematics and kinetics during side-step cutting in uninjured adolescent athletes. METHODS This prospective study included 88 limbs from 44 uninjured athletes aged 8-15 years (mean 12.3, SD 2.3; 19 (44%) female) who were evaluated during an anticipated 45° sid

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Zhang, L., J. Butler, T. Nishida, G. Nuber, H. Huang, and W. Z. Rymer. "In Vivo Determination of the Direction of Rotation and Moment-Angle Relationship of Individual Elbow Muscles." Journal of Biomechanical Engineering 120, no. 5 (1998): 625–33. http://dx.doi.org/10.1115/1.2834754.

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The direction of rotation (DOR) of individual elbow muscles, defined as the direction in which a muscle rotates the forearm relative to the upper arm in three-dimensional space, was studied in vivo as a function of elbow flexion and forearm rotation. Electrical stimulation was used to activate an individual muscle selectively, and the resultant flexion-extension, supination-pronation, and varus-valgus moments were used to determine the DOR. Furthermore, multi-axis moment-angle relationships of individual muscles were determined by stimulating the muscle at a constant submaximal level across di

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Buchanan, T. S., S. L. Delp, and J. A. Solbeck. "Muscular Resistance to Varus and Valgus Loads at the Elbow." Journal of Biomechanical Engineering 120, no. 5 (1998): 634–39. http://dx.doi.org/10.1115/1.2834755.

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Although the contributions of passive structures to stability of the elbow have been well documented, the role of active muscular resistance of varus and valgus loads at the elbow remains unclear. We hypothesized that muscles: (1) can produce substantial varus and valgus moments about the elbow, and (2) are activated in response to sustained varus and valgus loading of the elbow. To test the first hypothesis, we developed a detailed musculoskeletal model to estimate the varus and valgus moment-generating capacity of the muscles about the elbow. To test the second hypothesis, we measured EMGs f

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Hsieh, Y. F., and L. F. Draganich. "Increasing Quadriceps Loads Affect the Lengths of the Ligaments and the Kinematics of the Knee." Journal of Biomechanical Engineering 120, no. 6 (1998): 750–56. http://dx.doi.org/10.1115/1.2834889.

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The relationships between the lengths of the ligaments and kinematics of the knee and quadriceps load, for low to physiologic levels of quadriceps loads, have not previously been studied. We investigated the effects of increasing levels of quadriceps force, necessary to balance increasing levels of externally applied flexion moments, on the kinematics of the tibiofemoral joint and on the separation distances between insertions of selected fibers of the major ligaments of the knee in twelve cadavera. Static measurements were made using a six-degree-of-freedom digitizer for flexion angles rangin

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Tang, Hui, Jiahao Pan, Barry Munkasy, Kim Duffy, and Li Li. "Comparison of Lower Extremity Joint Moment and Power Estimated by Markerless and Marker-Based Systems during Treadmill Running." Bioengineering 9, no. 10 (2022): 574. http://dx.doi.org/10.3390/bioengineering9100574.

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Background: Markerless (ML) motion capture systems have recently become available for biomechanics applications. Evidence has indicated the potential feasibility of using an ML system to analyze lower extremity kinematics. However, no research has examined ML systems’ estimation of the lower extremity joint moments and powers. This study aimed to compare lower extremity joint moments and powers estimated by marker-based (MB) and ML motion capture systems. Methods: Sixteen volunteers ran on a treadmill for 120 s at 3.58 m/s. The kinematic data were simultaneously recorded by 8 infrared cameras

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Aagaard, Per, Erik B. Simonsen, S. Peter Magnusson, Benny Larsson, and Poul Dyhre-Poulsen. "A New Concept For Isokinetic Hamstring: Quadriceps Muscle Strength Ratio." American Journal of Sports Medicine 26, no. 2 (1998): 231–37. http://dx.doi.org/10.1177/03635465980260021201.

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Conventionally, the hamstring:quadriceps strength ratio is calculated by dividing the maximal knee flexor (hamstring) moment by the maximal knee extensor (quadriceps) moment measured at identical angular velocity and contraction mode. The agonist-antagonist strength relationship for knee extension and flexion may, however, be better described by the more functional ratios of eccentric hamstring to concentric quadriceps moments (extension), and concentric hamstring to eccentric quadriceps moments (flexion). We compared functional and conventional isokinetic hamstring: quadriceps strength ratios

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Jabeen, Saher, Patricia M. Baines, Jaap Harlaar, Heike Vallery, and Andrew Berry. "Reaction moments matter when designing lower-extremity robots for tripping recovery." PLOS ONE 18, no. 2 (2023): e0280158. http://dx.doi.org/10.1371/journal.pone.0280158.

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Balance recovery after tripping often requires an active adaptation of foot placement. Thus far, few attempts have been made to actively assist forward foot placement for balance recovery employing wearable devices. This study aims to explore the possibilities of active forward foot placement through two paradigms of actuation: assistive moments exerted with the reaction moments either internal or external to the human body, namely ‘joint’ moments and ‘free’ moments, respectively. Both paradigms can be applied to manipulate the motion of segments of the body (e.g., the shank or thigh), but joi

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Maas, Huub, and Peter A. Huijing. "Mechanical effect of rat flexor carpi ulnaris muscle after tendon transfer: does it generate a wrist extension moment?" Journal of Applied Physiology 112, no. 4 (2012): 607–14. http://dx.doi.org/10.1152/japplphysiol.01275.2011.

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The mechanical effect of a muscle following agonist-to-antagonist tendon transfers does not always meet the surgeon's expectations. We tested the hypothesis that after flexor carpi ulnaris (FCU) to extensor carpi radialis (ECR) tendon transfer in the rat, the direction (flexion or extension) of the muscle's joint moment is dependent on joint angle. Five weeks after recovery from surgery (tendon transfer group) and in a control group, wrist angle-moment characteristics of selectively activated FCU muscle were assessed for progressive stages of dissection: 1) with minimally disrupted connective

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Dempsey, Alasdair R., Bruce C. Elliott, Bridget J. Munro, Julie R. Steele, and David G. Lloyd. "Can Technique Modification Training Reduce Knee Moments in a Landing Task?" Journal of Applied Biomechanics 30, no. 2 (2014): 231–36. http://dx.doi.org/10.1123/jab.2013-0021.

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Anterior cruciate ligament (ACL) injuries are costly. Sidestep technique training reduces knee moments that load the ACL. This study examined whether landing technique training alters knee moments. Nineteen team sport athletes completed the study. Motion analysis and ground reaction forces were recorded before and after 6 weeks of technique modification. An inverse dynamic model was used to calculate three-dimensional knee loading. Pre- and postintervention scores were compared using pairedttests. Maximal knee flexion angle during landing was increased following training. There was no change i

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KWON, YURI, JAE-HOON HEO, HYEONG-MIN JEON, et al. "AGE–GENDER DIFFERENCE IN THE BIOMECHANICAL FEATURES OF SIT-TO-STAND MOVEMENT." Journal of Mechanics in Medicine and Biology 16, no. 08 (2016): 1640027. http://dx.doi.org/10.1142/s0219519416400273.

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The purpose of this study was to investigate the effects of age and gender on the biomechanical features of sit-to-stand (STS) movement. Twenty young subjects and 20 elderly subjects participated in this study. Nine events during STS movement were defined where joint angles and joint moments were extracted for further analyses. Two-way repeated measures ANOVA was performed for joint angles and joint moments with age and gender as independent factors. Major gender differences were shown in joint angles. Women used a sliding forward strategy more than men (more flexion of ankle and knee joint) d

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Gagnon, Dany, Annie-Claude Babineau, Audrey Champagne, Guillaume Desroches, and Rachid Aissaoui. "Trunk and Shoulder Kinematic and Kinetic and Electromyographic Adaptations to Slope Increase during Motorized Treadmill Propulsion among Manual Wheelchair Users with a Spinal Cord Injury." BioMed Research International 2015 (2015): 1–15. http://dx.doi.org/10.1155/2015/636319.

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The main objective was to quantify the effects of five different slopes on trunk and shoulder kinematics as well as shoulder kinetic and muscular demands during manual wheelchair (MWC) propulsion on a motorized treadmill. Eighteen participants with spinal cord injury propelled their MWC at a self-selected constant speed on a motorized treadmill set at different slopes (0°, 2.7°, 3.6°, 4.8°, and 7.1°). Trunk and upper limb movements were recorded with a motion analysis system. Net shoulder joint moments were computed with the forces applied to the handrims measured with an instrumented wheel. T

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Bumbard, Katy Baker, Harold Herrington, Chung-Hyun Goh, and Alwathiqbellah Ibrahim. "Incorporation of Torsion Springs in a Knee Exoskeleton for Stance Phase Correction of Crouch Gait." Applied Sciences 12, no. 14 (2022): 7034. http://dx.doi.org/10.3390/app12147034.

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Crouch gait is a motor complication that is commonly associated with cerebral palsy, spastic diplegia, stroke, and motor-neurological pathologies, broadly defined as knee flexion in excess of 20° in the gait cycle. Uncorrected crouch gait results in fatigue, joint degradation, and loss of ambulation. Torsion springs have been used in cycling to store energy in the knee flexion to reduce fatigue in the quadriceps during knee extension. SolidWorks was used to design a passive exoskeleton for the knee, incorporating torsion springs of stiffnesses 20,000 N/mm and 30,000 N/mm at the knee joint, to

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Yu, Yuanyuan, Hongshi Huang, Shuang Ren, et al. "Lower Limb Biomechanics During Level Walking After an Isolated Posterior Cruciate Ligament Rupture." Orthopaedic Journal of Sports Medicine 7, no. 12 (2019): 232596711989116. http://dx.doi.org/10.1177/2325967119891164.

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Background: The posterior cruciate ligament (PCL) is an important structure in knee stabilization. Knee cartilage degeneration after a PCL injury has been reported in several studies. Understanding the changes in movement patterns of patients with PCL ruptures could help clinicians make specific treatment protocols to restore patients’ sporting ability and prevent joint degeneration. However, the kinematics and kinetics of the lower limb in patients with PCL injuries are still not clear. Purpose: To investigate the biomechanical characteristics during level walking in patients with isolated PC

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Crewe, Helen, Amity Campbell, Bruce Elliott, and Jacqueline Alderson. "Kinetic Sensitivity of a New Lumbo-Pelvic Model to Variation in Segment Parameter Input." Journal of Applied Biomechanics 29, no. 3 (2013): 354–59. http://dx.doi.org/10.1123/jab.29.3.354.

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This study aimed to assess variability in lumbo-pelvic forces and moments during a dynamic high-impact activity (cricket fast bowling) when calculated using different body segment parameters (BSPs). The first three BSPs were estimated using methods where the trunk was divided into segments according to nonspinal anatomical landmarks. The final approach defined segment boundaries according to vertebral level. Three-dimensional motion analysis data from nine male cricketers’ bowling trials were processed using the four BSPs. A repeated-measures analysis of variance revealed no significant effect

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Mizutori, Hisashi, Yu Kashiwagi, Noriko Hakamada, Yasunori Tachibana, and Kazuo Funato. "Kinematics and joints moments profile during straight arm press to handstand in male gymnasts." PLOS ONE 16, no. 7 (2021): e0253951. http://dx.doi.org/10.1371/journal.pone.0253951.

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Biomechanical features of the handstand, one of the most fundamental skills required for artistic gymnastics events, have not been well documented. The purpose of this study was to clarify the kinematics and joint moment profiles during straight arm press to handstand in different highly skilled male gymnasts. Fifty-nine male gymnasts performed a straight arm press to handstand on a force platform and were judged on their performance by experienced certified judges. Subjects were divided into two groups (highly-skilled and less-skilled). Kinematic data were obtained using a video camera synchr

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Yee, Albert G., and C. Daniel Mote. "Forces and Moments at the Knee and Boot Top: Models for an Alpine Skiing Population." Journal of Applied Biomechanics 13, no. 3 (1997): 373–84. http://dx.doi.org/10.1123/jab.13.3.373.

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The purpose of this study was to identify regression models to predict moments at the boot top and knee from the force components at the bindings for a sample of skiers. Six subjects skied a slalom course, first with their boots set to the least stiff setting and then with their boots set to the most stiff setting. Six load component dynamometers measured force and moment components at the toe and heel bindings. An electrogoniometer measured ankle flexion. Regression models were developed for the subject sample that predicted quasi-static moment components at the boot top and knee from measure

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Sauer, Adrian, Allan Maas, Svenja Ottawa, Alexander Giurea, and Thomas M. Grupp. "Towards a New, Pre-Clinical, Subject-Independent Test Model for Kinematic Analysis after Total Knee Arthroplasty—Influence of the Proximo-Distal Patella Position and Patellar Tendon Stiffness." Applied Sciences 11, no. 21 (2021): 10322. http://dx.doi.org/10.3390/app112110322.

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Although simulation models are heavily used in biomechanical research and testing of TKA implants, pre-clinical tools for a holistic estimation of implant performance under dynamic loading conditions are rare. The objective of this study was the development of an efficient pre-clinical test method for analyzing knee contact mechanics and kinematics based on a dynamic FE model and to evaluate the effects of the proximo-distal patella position and the patellar tendon stiffness on the patellar kinematics. A finite element-based workflow for knee prostheses designs was developed based on standardi

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Willwacher, Steffen, Wolfgang Potthast, Markus Konrad, and Gert-Peter Brüggemann. "Effect of Heel Construction on Muscular Control Potential of the Ankle Joint in Running." Journal of Applied Biomechanics 29, no. 6 (2013): 740–48. http://dx.doi.org/10.1123/jab.29.6.740.

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The purpose of this study was to investigate the effect of heel construction on ankle joint mechanics during the early stance phase of running. Kinematic and kinetic parameters (ankle joint angles, angular velocities and joint moments, lever arms of ground reaction force, triceps surae muscle tendon unit lengths, and rates of muscle tendon unit length change) were calculated from 19 male subjects running at 3.3 m/s in shoes with different heel constructions. Increasing heel height and posterior wedging amplified initial plantar flexion velocity and range. The potential for a muscle to control

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BISI, MARIA CRISTINA, RITA STAGNI, GIANNI GNUDI, and ANGELO CAPPELLO. "NON-CIRCULAR CHAIN RING ALLOWS A REDUCTION OF JOINT LOADING IN CYCLING." Journal of Mechanics in Medicine and Biology 10, no. 01 (2010): 113–22. http://dx.doi.org/10.1142/s0219519410003228.

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Non-circular (NC) chain rings were primarily designed to improve the mechanical effectiveness of cycling. Their use can be investigated for application in rehabilitation: they could provide a solution to design an effective exercise reducing joint loading. The aim of this study was to analyze the differences in kinematics, energy consumption, and joint moments between circular and NC chain rings, then to identify a profile that can reduce joint loads, maintaining equal mechanical and metabolic works. Five young participants performed two tests on a cycloergometer; one with a circular chain rin

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Tsitlakidis, Stefanos, Nicholas A. Beckmann, Sebastian I. Wolf, Sébastien Hagmann, Tobias Renkawitz, and Marco Götze. "GMFCS Level-Specific Differences in Kinematics and Joint Moments of the Involved Side in Unilateral Cerebral Palsy." Journal of Clinical Medicine 11, no. 9 (2022): 2556. http://dx.doi.org/10.3390/jcm11092556.

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A variety of gait pathologies is seen in cerebral palsy. Movement patterns between different levels of functional impairment may differ. The objective of this work was the evaluation of Gross Motor Function Classification System (GMFCS) level-specific movement disorders. A total of 89 individuals with unilateral cerebral palsy and no history of prior treatment were included and classified according to their functional impairment. GMFCS level-specific differences, kinematics and joint moments, exclusively of the involved side, were analyzed for all planes for all lower limb joints, including pe

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Fiedler, Goeran, Brooke Slavens, Roger O. Smith, Douglas Briggs, and Brian J. Hafner. "Criterion and Construct Validity of Prosthesis-Integrated Measurement of Joint Moment Data in Persons With Transtibial Amputation." Journal of Applied Biomechanics 30, no. 3 (2014): 431–38. http://dx.doi.org/10.1123/jab.2013-0309.

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Prosthesis-integrated sensors are appealing for use in clinical settings where gait analysis equipment is unavailable, but accurate knowledge of patients’ performance is desired. Data obtained from load cells (inferring joint moments) may aid clinicians in the prescription, alignment, and gait rehabilitation of persons with limb loss. The purpose of this study was to assess the accuracy of prosthesis-integrated load cells for routine use in clinical practice. Level ground walking of persons with transtibial amputation was concurrently measured with a commercially available prosthesis-integrate

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Cadène, Nicole. "Pas de statue pour Hubertine : quand notre mémoire d’une pionnière du suffragisme fait des vagues." Histoire sociale / Social History 56, no. 116 (2023): 323–40. http://dx.doi.org/10.1353/his.2023.a914566.

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Abstract: En 1914, la disparition d’Hubertine Auclert, qui avait voué sa vie au combat féministe, provoque une grande émotion. On envisage de lui ériger une statue, mais ce projet ne se concrétisera pas. C’est autour de lieux de mémoire plus confidentiels que son souvenir est préservé. Nous avons identifié trois moments, chacun associé à des lieux différents. Jusqu’en 1930, la tombe de la suffragiste s’impose comme un lieu de pèlerinage féministe. Les années suivantes offrent l’apparence d’un creux de la vague mémoriel, mais c’est alors que la militante Marie-Louise Bouglé recueille dans sa bi

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Richards, Jim, Dominic Thewlis, James Selfe, Andrew Cunningham, and Colin Hayes. "A Biomechanical Investigation of A Single-Limb Squat: Implications for Lower Extremity Rehabilitation Exercise." Journal of Athletic Training 43, no. 5 (2008): 477–82. http://dx.doi.org/10.4085/1062-6050-43.5.477.

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Abstract Context: Single-limb squats on a decline angle have been suggested as a rehabilitative intervention to target the knee extensors. Investigators, however, have presented very little empirical research in which they have documented the biomechanics of these exercises or have determined the optimum angle of decline used. Objective: To determine the involvement of the gastrocnemius and rectus femoris muscles and the external ankle and knee joint moments at 60° of knee flexion while performing a single-limb squat at different decline angles. Design: Participants acted as their own controls

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Chalmers, Brian P., Shady S. Elmasry, Cynthia A. Kahlenberg, et al. "Additional distal femoral resection increases mid-flexion coronal laxity in posterior-stabilized total knee arthroplasty with flexion contracture." Bone & Joint Journal 103-B, no. 6 Supple A (2021): 87–93. http://dx.doi.org/10.1302/0301-620x.103b6.bjj-2020-2444.r1.

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Aims Surgeons commonly resect additional distal femur during primary total knee arthroplasty (TKA) to correct a flexion contracture, which leads to femoral joint line elevation. There is a paucity of data describing the effect of joint line elevation on mid-flexion stability and knee kinematics. Thus, the goal of this study was to quantify the effect of joint line elevation on mid-flexion laxity. Methods Six computational knee models with cadaver-specific capsular and collateral ligament properties were implanted with a posterior-stabilized (PS) TKA. A 10° flexion contracture was created in ea

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Gholami, Milad, Alireza Choobineh, Mohammad Abdoli-Eramaki, Azizallah Dehghan, and Mohammad Taghi Karimi. "Investigating the Effect of Keyboard Distance on the Posture and 3D Moments of Wrist and Elbow Joints among Males Using OpenSim." Applied Bionics and Biomechanics 2022 (May 5, 2022): 1–10. http://dx.doi.org/10.1155/2022/5751488.

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Musculoskeletal disorders (MSDs) of the upper extremities and computer use are common in modern societies, and both show a growing trend. This study was conducted to determine the posture and 3D moments of wrist and elbow joints at different keyboard distances on a desk. Twelve healthy right-handed male volunteers attended the motion analysis laboratory. A keyboard was placed at three different distances from the participants’ bodies while performing a standard computer task. The workstation was adjusted according to ANSI/HFES-100-2007 standard for each participant to maintain a comfortable er

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Muller, Antoine, Hakim Mecheri, Philippe Corbeil, André Plamondon, and Xavier Robert-Lachaine. "Inertial Motion Capture-Based Estimation of L5/S1 Moments during Manual Materials Handling." Sensors 22, no. 17 (2022): 6454. http://dx.doi.org/10.3390/s22176454.

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Inertial motion capture (IMC) has gained popularity in conducting ergonomic studies in the workplace. Because of the need to measure contact forces, most of these in situ studies are limited to a kinematic analysis, such as posture or working technique analysis. This paper aims to develop and evaluate an IMC-based approach to estimate back loading during manual material handling (MMH) tasks. During various representative workplace MMH tasks performed by nine participants, this approach was evaluated by comparing the results with the ones computed from optical motion capture and a large force p

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Xu, Dali, John W. Chow, and Y. Tai Wang. "Effects of Turn Angle and Pivot Foot on Lower Extremity Kinetics during Walk and Turn Actions." Journal of Applied Biomechanics 22, no. 1 (2006): 74–79. http://dx.doi.org/10.1123/jab.22.1.74.

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This study examined lower extremity joint moments during walk and turn with different turn angles and pivot feet. Seven young adults (age 21 ± 1.3 yrs) were asked to walk at a self-selected speed (1.35 ± 0.15 m/s) and to turn to the right using right (spin turn) and left (step turn) pivot feet at turn angles of 0° (walking straight), 45°, and 90°. Video and forceplate systems were employed for kinematic and kinetic data collection. Inverse dynamics approach was used to compute joint moments using segmental kinematics, ground reaction forces, and moments. The participants decreased their forwar

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Al-Eisawi, Khaled W., Carter J. Kerk, and Jerome J. Congleton. "Limitations of Wrist Strength to Manual Exertion Capability in 2D Biomechanical Modeling." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 38, no. 10 (1994): 559–63. http://dx.doi.org/10.1177/154193129403801004.

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The objective of this study is to evaluate the assumption in biomechanical models that wrist strength does not limit manual exertion capability. An experiment was designed and run on right-handed males to test isometric elbow flexion strength at two included elbow angles: 90° and 135° and in two forearm positions: supinated and mid between supination and pronation. Isometric wrist flexion strength was also measured at the same elbow angles and at two wrist positions in the flexion/extension plane: neutral and 45° extended. Isometric wrist radial deviation strength was measured at the same two

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Wyszomierski, Sarah A., April J. Chambers, and Rakié Cham. "Knee Strength Capabilities and Slip Severity." Journal of Applied Biomechanics 25, no. 2 (2009): 140–48. http://dx.doi.org/10.1123/jab.25.2.140.

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Slips and falls are a serious public health concern in older populations. Reduced muscle strength is associated with increased age and fall incidence. Understanding the relationships between specific joint muscle strength characteristics and propensity to slip is important to identify biomechanical factors responsible for slip-initiated falls and to improve slip/fall prevention programs. Knee corrective moments generated during slipping assist in balance recovery. Therefore, the study goal was to investigate the relationship between knee flexion/extension strength and slip severity. Isometric

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Chen, Diwei, Dong Sun, Fengping Li, et al. "Identifying the Primary Kinetic Factors Influencing the Anterior–Posterior Center of Mass Displacement in Barbell Squats: A Factor Regression Analysis." Sensors 25, no. 2 (2025): 572. https://doi.org/10.3390/s25020572.

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Background: Barbell squats are commonly used in strength training, but the anterior–posterior displacement of the Center of Mass (COM) may impair joint stability and increase injury risk. This study investigates the key factors influencing COM displacement during different squat modes.; Methods: This study recruited 15 male strength training enthusiasts, who performed 60% of their one-repetition maximum (1RM) in the Front Barbell Squat (FBS), High Bar Back Squat (HBBS), and Low Bar Back Squat (LBBS). Joint moments at both the hip, knee, and ankle were collected using a motion capture system an

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Golden, Grace M., Michael J. Pavol, and Mark A. Hoffman. "Knee Joint Kinematics and Kinetics During a Lateral False-Step Maneuver." Journal of Athletic Training 44, no. 5 (2009): 503–10. http://dx.doi.org/10.4085/1062-6050-44.5.503.

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Abstract Context: Cutting maneuvers have been implicated as a mechanism of noncontact anterior cruciate ligament (ACL) injuries in collegiate female basketball players. Objective: To investigate knee kinematics and kinetics during running when the width of a single step, relative to the path of travel, was manipulated, a lateral false-step maneuver. Design: Crossover design. Setting: University biomechanics laboratory. Patients or Other Participants: Thirteen female collegiate basketball athletes (age = 19.7 ± 1.1 years, height = 172.3 ± 8.3 cm, mass = 71.8 ± 8.7 kg). Intervention(s): Three co

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Liu, Zhiyong, Chen Yang, Jiabin Yu, et al. "The Effect of Muscles Fatigue on the Knee’s Kinetics and Kinematics Characteristics." Sustainability 15, no. 4 (2023): 3029. http://dx.doi.org/10.3390/su15043029.

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Badminton is very popular on college campuses. In badminton, the anterior cruciate ligament of the players has a higher risk of injury. There are many studies investigating the impact of fatigue on the injury of professional athletes, but few studies focused on college students. We hypothesized that the knee joint would experience greater ground reaction forces, valgus moments, and flexion moments of lunge contact in amateur after fatigue than those indicators before fatigue. Ten male badminton amateurs were enrolled in this study. They performed a lunge to hit the shuttlecock at the designate

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Miller, S., A. Agarwal, WB Haddon, et al. "Comparison of gait kinetics in total and unicondylar knee replacement surgery." Annals of The Royal College of Surgeons of England 100, no. 4 (2018): 267–74. http://dx.doi.org/10.1308/rcsann.2017.0226.

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Introduction The aim of this study was to compare kinetical data from gait analysis of patients who have undergone total and uni-condylar knee replacement. Materials and methods Thirteen patients with unilateral total knee arthroplasty (TKA) and 13 unicondylar knee arthroplasty (UKA), were included, all performed by the same surgeon more than one year prior. The Vicon gait analysis system was used. Statistical power was calculated using SPSS. Results No significant difference was found in the spatiotemporal parameters of gait and survival years of the knee prosthesis between the two groups. Th

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Mohammadi, Vahid, Amir Letafatkar, and Amir Ali Jafarnezhadgero. "Effects of Core Stability Training on Kinematic and Kinetic Variables in Patients With Chronic Low Back Pain." Physical Treatments - Specific Physical Therapy Journal 13, no. 1 (2023): 55–66. http://dx.doi.org/10.32598/ptj.13.1.551.1.

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Purpose: This study aims to assess the effects of an 8-week core stability training on the kinematics and kinetics of trunk flexion and extension motions in patients with chronic non-specific low back pain (CNSLBP). Methods: A total of 30 CNSLBP patients with the age range of 25 to 45 years were randomly divided into 2 equally sized groups. The subjects were identified through clinical examination. Before and after the training, tests were applied to assess peak 3-dimensional hip joint moments, peak negative and positive hip joint powers, and lumbopelvic coupling angles during trunk flexion an

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Tsitlakidis, Stefanos, Sarah Campos, Paul Mick, et al. "Gait Deviations of the Uninvolved Limb and Their Significance in Unilateral Cerebral Palsy." Symmetry 15, no. 10 (2023): 1922. http://dx.doi.org/10.3390/sym15101922.

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Little is known about the impact of the impaired limb on the uninvolved side, which might influence the overall functional outcome in individuals with unilateral cerebral palsy (CP). The objective of this work was to perform an assessment considering the kinematics/joint moments and ground reaction forces (GRFs). Eighty-nine individuals with unilateral CP were included and classified according to their functional impairment. Level-specific differences according to the Gross Motor Function Classification System (GMFCS), including pelvic and trunk movements, were analyzed using instrumented 3D g

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Luis, Israel, Maarten Afschrift, and Elena M. Gutierrez-Farewik. "Springs vs. motors: Ideal assistance in the lower limbs during walking at different speeds." PLOS Computational Biology 20, no. 9 (2024): e1011837. http://dx.doi.org/10.1371/journal.pcbi.1011837.

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Recent years have witnessed breakthroughs in assistive exoskeletons; both passive and active devices have reduced metabolic costs near preferred walking speed by assisting muscle actions. Metabolic reductions at multiple speeds should thus also be attainable. Musculoskeletal simulation can potentially predict the interaction between assistive moments, muscle-tendon mechanics, and walking energetics. In this study, we simulated devices’ optimal assistive moments based on minimal muscle activations during walking with prescribed kinematics and dynamics. We used a generic musculoskeletal model wi

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