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Relevant bibliographies by topics / Polycentric knee

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Academic literature on the topic 'Polycentric knee'

Author: Grafiati

Published: 3 June 2025

Last updated: 6 July 2025

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Journal articles on the topic "Polycentric knee"

1

GUNSTON, FRANK H., and RICHARD S. BRYAN. "Polycentric Knee Arthroplasty." Clinical Orthopaedics and Related Research &NA;, no. 205 (1986): 4. http://dx.doi.org/10.1097/00003086-198604000-00002.

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Lee, Wen-Tzong, Kevin Russell, and Raj S. Sodhi. "On Transfemoral Prosthetic Knee Design for Natural Human Knee Motion." Recent Patents on Mechanical Engineering 13, no. 1 (2020): 49–59. http://dx.doi.org/10.2174/2212797613666191219154947.

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Background: A transfemoral prosthetic knee is an artificial knee used by above-the-knee amputees. There are two major categories of transfemoral prosthetic knee designs: pin joint-based and polycentric designs. While pin joint-based knee designs only allow pure rotation of the knee, polycentric knee designs allow a combination of rotational and translational knee motion which is exhibited in natural knee motion. Objective: This work presents both the recently-patented design process and the resulting design of a polycentric transfemoral prosthetic knee that approximates natural spatial human knee motion during flexion and extension. Methods: The design process includes tibial motion acquisition, Revolute-Revolute-Spherical-Spherical linkage (or RRSS) motion generation, RRSS linkage axode generation and circle fitting. The polycentric transfemoral prosthetic knee design produced from this process includes a gear joint with a specific spatial orientation to approximate natural spatial human knee motion. Results: Using the design process, a polycentric transfemoral prosthetic knee was designed to replicate a group of five tibial positions over 37.5° of knee flexion (the amount of knee flexion in a standard human gait cycle) with a minimal structural error. Conclusion: The circular gear-based knee design accurately replicated natural spatial knee motion over the tibial position data given for a standard human gait cycle. The knee design method must be implemented over a broader sampling of tibial position data to determine if a circular gear-based knee design is consistently accurate.

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Kadhim, Fahad Mohanad, Jumaa Salman Chiad, and Maryam Abdul Salam Enad. "Evaluation and Analysis of Different Types of Prosthetic Knee Joint Used by above Knee Amputee." Defect and Diffusion Forum 398 (January 2020): 34–40. http://dx.doi.org/10.4028/www.scientific.net/ddf.398.34.

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Four prosthetic knee joints (polycentric knee weight activating-4bar and friction, extension assist controlled),(single axis knee weight activating and friction, internal extension assist controlled), (single axis knee weight activating-4bar and hydraulically, controlled) and (polycentric knee geometric locking-6bar, hydraulically controlled) for a trans-femoral patient were tested. The tests were conducted to find the maximum velocity as well as discussing the most comfortable prosthetic forthe patient and walking stability for these prosthetic knees by examining the gait cycle and measuring the ground reaction force (GRF), using force a plate device. Also, the interface pressure was measured between socket and stump muscles by using F-socket device to get the stress distribution during walking with a prosthetic knee. Results manifested that the polycentric knee geometric locking - 6bar, hydraulically controlled is the best because of the good homogenous distribution of GRF between the healthy and prosthetic limb, during which the difference between both the healthy and prosthetic limb is with the least value (4%).And, K4 gives the minimum value of differences in contact pressure between the left and right limb with a value of (24%), it alsoimparts the maximum symmetry between the left and right limb according to the gait cycle parameters.The best results of the interface pressures and kinovea velocity are achieved whenK4 is used with (132.4KPa, 0.71m/s), respectively. Finally, the polycentric knee geometric locking - 6bar, hydraulically controlled is the best according to the ANSYS results during which it yields the minimum values of Von-Mises stress with 14.24MPa and a maximum factor of safety of 3.11.

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Anand, TS, and S. Sujatha. "A method for performance comparison of polycentric knees and its application to the design of a knee for developing countries." Prosthetics and Orthotics International 41, no. 4 (2016): 402–11. http://dx.doi.org/10.1177/0309364616652017.

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Background:Polycentric knees for transfemoral prostheses have a variety of geometries, but a survey of literature shows that there are few ways of comparing their performance.Objectives:Our objective was to present a method for performance comparison of polycentric knee geometries and design a new geometry.Study design:In this work, we define parameters to compare various commercially available prosthetic knees in terms of their stability, toe clearance, maximum flexion, and so on and optimize the parameters to obtain a new knee design.Methods:We use the defined parameters and optimization to design a new knee geometry that provides the greater stability and toe clearance necessary to navigate uneven terrain which is typically encountered in developing countries.Results:Several commercial knees were compared based on the defined parameters to determine their suitability for uneven terrain. A new knee was designed based on optimization of these parameters. Preliminary user testing indicates that the new knee is very stable and easy to use.Conclusion:The methodology can be used for better knee selection and design of more customized knee geometries.Clinical relevanceThe method provides a tool to aid in the selection and design of polycentric knees for transfemoral prostheses.

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Gunston, Frank H. "THE CLASSIC: Polycentric Knee Arthroplasty." Clinical Orthopaedics and Related Research 446 (May 2006): 11–12. http://dx.doi.org/10.1097/01.blo.0000214423.59829.04.

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Bopp, Florian, Jens Stecher, Ingomar Lorenz, and Ulrich Holz. "The Unicompartmental Polycentric Knee Arthroplasty." Orthopaedics and Traumatology 9, no. 3 (2001): 207–17. http://dx.doi.org/10.1007/s065-001-8355-0.

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Memisoglu, Kaya. "Revision of the Gunston polycentric knee arthroplasty with total knee arthroplasty." Acta Orthopaedica et Traumatologica Turcica 44, no. 5 (2010): 410–12. http://dx.doi.org/10.3944/aott.2010.2317.

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MOHANTY, RAJESH KUMAR, STHIRPRANJYAN BISWAL, PABITRA KUMAR SAHOO, SAKTI PRASAD DAS, R. C. MOHANTY, and SUKANTA KUMAR SABUT. "CLINICAL GAIT ANALYSIS OF SUBJECTS WITH TRANS-FEMORAL AMPUTATION USING POLYCENTRIC FOUR-BAR LINKAGE PROSTHETIC KNEE JOINT." Journal of Mechanics in Medicine and Biology 20, no. 05 (2020): 2050021. http://dx.doi.org/10.1142/s0219519420500219.

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Background: Adequate research is not reported so far to underline the influence of commonly used polycentric knee joints on gait performance of subjects with trans-femoral amputation. Objective: The intent of this investigation is to analyze prosthetic gait of unilateral traumatic trans-femoral amputees with polycentric four-bar linkage knee and compare it with normal subjects for evaluating any asymmetry in gait performance. Methods: Objective three-dimensional gait analysis of 15 subjects [mean (age): 36.4 (10.7) years] were performed in gait lab through force plate and optoelectronic devices to measure temporal-spatial parameters, kinematic and kinetic performances. Gait patterns of amputees were compared with those of 15 individuals with normal gait to analyze distinct functionalities of existing polycentric knee. Results: Asymmetry in gait was observed between amputees and normal subjects for all variables concerned ([Formula: see text]). Amputee gait was with significantly lesser velocity, cadence with shorter step and stride length. There was significantly less hip, knee and pelvic motions, however, pelvic obliquity and rotation did not show significant difference from the normal subjects. The vertical component of the ground reaction force differed significantly between prosthetic and intact limb [49.7 (8.5)% and 90.4 (7.4)% body weight] and also from normal subjects [107.5 (2.4)% body weight] during stance ([Formula: see text]). Interpretation and Conclusion: This difference may be attributed to nonproportionate loading of limbs and mechanical adaptations for counteracting deficiencies of prosthetic side. This study will help to explain gait asymmetry in trans-femoral amputees and to identify underlying mechanisms to enhance the quality of the existing design of prosthetic knee through optimizing design parameters and utilizing appropriate materials.

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Koçak, Mertcan, and Erkin Gezgin. "Unified Design Methodology for a Polycentric Transfemoral Knee Prosthesis Using Kinematic Synthesis." Machines 13, no. 1 (2024): 20. https://doi.org/10.3390/machines13010020.

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This study introduces a novel single-degree-of-freedom polycentric knee mechanism specifically designed for transfemoral prostheses to address dual challenges of stability during the stance phase and biomimetic motion during the swing phase. Leveraging analytical kinematic synthesis, the proposed mechanism integrates separate kinematic designs for each of the gait phases into a combined structure that prevents singularity issues during full knee flexion, which is a significant limitation in conventional active designs. The stance phase mechanism emphasizes stability through precise control of the instantaneous center of rotation (ICR) and weight-bearing support, while the swing phase mechanism adopts a biomimetic motion trajectory. In order to validate the proposed methodology, kinematic synthesis, numerical simulations, and visual analyses were conducted. Incorporating insights from polycentric prostheses and orthotic applications, the proposed mechanism achieves a seamless transition between two different configurations by keeping its overall mobility. Additionally, its possible compatibility with motorized actuation offers a foundation for active prosthesis systems, paving the way for adapting the advantages of polycentric prosthesis to active devices. This innovative approach offers a scientifically grounded pathway for improving transfemoral prosthetic systems, advancing both their biomechanical utility and user comfort.

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Hoseini, Saman, and Mohammad Reza S. Noorani. "FEM-based Fatigue Analysis on a 4-Bar Polycentric Knee of Above-Knee Prostheses." International Journal of Biomedical Engineering and Technology 1, no. 1 (2023): 1. http://dx.doi.org/10.1504/ijbet.2023.10056453.

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Dissertations / Theses on the topic "Polycentric knee"

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Roetter, Adam Daniel. "Compliant Prosthetic Knee Extension Aid: A Finite Elements Analysis Investigation of Proprioceptive Feedback During the Swing Phase of Ambulation." [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002647.

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Book chapters on the topic "Polycentric knee"

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Cárdenas, A. M., J. Uribe, and A. M. Hernández. "Parametric Modeling of Kinetic-Kinematic Polycentric Mechanical Knee." In VII Latin American Congress on Biomedical Engineering CLAIB 2016, Bucaramanga, Santander, Colombia, October 26th -28th, 2016. Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-4086-3_150.

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Koçak, Mertcan, and Erkin Gezgin. "Utilization of Kinematic Synthesis Methodology on a Novel Polycentric Mechanism for Transfemoral Knee Prosthesis." In Mechanisms and Machine Science. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-67383-2_25.

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Barkataki, Rwittik, Zahnupriya Kalita, and Sushen Kirtania. "Finite Element Analysis of a Novel Lower Extremity Exoskeleton with a Polycentric Knee Joint." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-5423-6_37.

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Morales-Cruz, Cuauhtémoc, Edgar Alfredo Portilla-Flores, Rosaura Anaíd Suárez-Santillán, Noemi Hernández-Oliva, and Maria Bárbara Calva-Yáñez. "Synthesis of a Non-Grashof Six-Bar Polycentric Knee Prostheses Using an Evolutionary Optimization Algorithm." In EngOpt 2018 Proceedings of the 6th International Conference on Engineering Optimization. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-97773-7_97.

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Hidrobo, Sebastian, Fernando Valencia, and Luz Tobar. "Adjustable Polycentric Mechanism for External Knee Joint Prosthesis Based on the Instantaneous Center of Rotation." In Emerging Research in Intelligent Systems. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-52258-1_9.

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Conference papers on the topic "Polycentric knee"

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Roetter, Adam D., Craig P. Lusk, and Rajiv Dubey. "Bistable Compliant Extension Aid for a Polycentric Prosthetic Knee." In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-86990.

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A compliant add-on mechanism for polycentric prosthetic knees was designed to provide two additional features beyond those already provided by the knee, the additional features being a stable equilibrium position when the knee is bent for the sitting posture and a moment-rotation profile that helps prevent excessive heel rise. The mechanism, dubbed the Bistable Compliant Extension Aid (BCEA), was developed and analyzed using finite-element-analysis (FEA) software. The BCEA was shown to satisfy the design requirements, prevention of excessive heel rise and providing a stable sitting position, based on its reaction moments for knee flexions ranging between 0 and 90 degrees.

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Baser, Ozgun, Levent Cetin, and Erol Uyar. "Kinematic analysis of polycentric artificial knee joint." In 2009 14th National Biomedical Engineering Meeting. IEEE, 2009. http://dx.doi.org/10.1109/biyomut.2009.5130298.

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Kikuchi, Takehito, Takumi Nishimura, Kenji Fukuoka, Takeru Todaka, and Isao Abe. "Design of Polycentric Assistive Device for Knee Joint." In 2021 30th IEEE International Conference on Robot & Human Interactive Communication (RO-MAN). IEEE, 2021. http://dx.doi.org/10.1109/ro-man50785.2021.9515529.

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Altamirano, A., L. Leija, A. Vera, R. Munoz, and A. Valentino. "Low cost knee bionic prosthesis based on polycentric mechanisms." In 2012 Pan American Health Care Exchanges (PAHCE 2012). IEEE, 2012. http://dx.doi.org/10.1109/pahce.2012.6233447.

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Pfeifer, Serge, Robert Riener, and Heike Vallery. "An actuated transfemoral prosthesis with optimized polycentric knee joint." In 2012 4th IEEE RAS & EMBS International Conference on Biomedical Robotics and Biomechatronics (BioRob 2012). IEEE, 2012. http://dx.doi.org/10.1109/biorob.2012.6290745.

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Omori, Kanta, Takeru Todaka, Hinako Watanabe, Isao Abe, and Takehito Kikuchi. "Optimal Design of Polycentric Joint for Semi-Active Knee Supporter." In 2024 IEEE/SICE International Symposium on System Integration (SII). IEEE, 2024. http://dx.doi.org/10.1109/sii58957.2024.10417673.

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Contreras-Tenorio, Enrique, Ilse Kardasch-Nava, Shazer Gonzalez de Salceda, et al. "Lower limb prosthesis: Optimization by lattice and four-bar polycentric knee." In 2021 43rd Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC). IEEE, 2021. http://dx.doi.org/10.1109/embc46164.2021.9630785.

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Amador, Belkys T., Rafael R. Torrealba, and Carmen M. Muller-Karger. "Conceptual design of a polycentric knee prosthesis for transfemoral amputees in Venezuela." In 2011 Pan American Health Care Exchanges (PAHCE 2011). IEEE, 2011. http://dx.doi.org/10.1109/pahce.2011.5871900.

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Williams, John L. "Polycentric Versus Single Axis Sagittal Femoral Geometry and Paradoxical Anterior Translation in Total Knee Implants." In ASME 2009 4th Frontiers in Biomedical Devices Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/biomed2009-83011.

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Paradoxical anterior translation of the femur (undesirable anterior motion of the femoral side of the knee relative to the tibia) has been observed in patients with posterior cruciate ligament (PCL) retaining total knee devices in which the ACL is absent. Simulations of a double leg squat of several total knee implant designs were compared using measurements of tibio-femoral ‘contact positions’ similar to those published in fluoroscopic studies. The objective of the study was to examine if a femoral design with a single axis (single radius) of curvature in the para-sagittal plane undergoes paradoxical anterior translation in the same way as femoral designs with polycentric (multi-radius) geometry.

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Amador, Belkys T., Carmen M. Muller-Karger, Rafael R. Torrealba, and Antonio Vidal. "Comparison of the contact conditions in the structural analysis of a polycentric knee prosthesis." In 2013 Pan American Health Care Exchanges (PAHCE). IEEE, 2013. http://dx.doi.org/10.1109/pahce.2013.6568228.

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