Comparing Patellofemoral Kinematics Assessed With a Novel Muscle Actuator System and an Oxford Rig Using Noncadaveric Knees.

IF 1.7 4区 医学 Q4 BIOPHYSICS
Alexandre Galley, Samira Vakili, Ilya Borukhov, Brent Lanting, Stephen J Piazza, Ryan Willing
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Abstract

Total knee replacement (TKR) failure, low patient satisfaction and high revision surgery rates may stem from insufficient preclinical testing. Conventional joint motion simulators for preclinical testing of TKR implants manipulate a knee joint in force, displacement, or simulated muscle control. However, a rig capable of using all three control modes has yet to be described in literature. This study aimed to validate a novel platform, the muscle actuator system (MAS), that can generate gravity-dependent, quadriceps-controlled squatting motions representative of an Oxford rig knee simulator and is mounted onto a force/displacement-control-capable joint motion simulator. Synthetic knee joint phantoms were created that comprised revision TKR implants and key extensor and flexor mechanism analogues, but no ligaments. The combined system implemented a constant force vector acting from simulated hip-to-ankle coordinates, effectively replicating gravity as observed in an Oxford rig. Quadriceps forces and patellofemoral joint kinematics were measured to assess the performance of the MAS and these tests showed high levels of repeatability and reproducibility. Forces and kinematics measured at a nominal patellar tendon length, and with patella alta and baja, were compared against those measured under the same conditions using a conventional Oxford rig, the Pennsylvania State Knee Simulator (PSKS). There was disagreement in absolute kinematics and muscle forces, but similar trends resulting from changing prosthesis design or patellar tendon length.

比较新型肌肉致动器系统和使用非尸体膝盖的Oxford Rig评估的髌骨股骨运动学。
全膝关节置换术(TKR)失败,低患者满意度和高翻修手术率可能源于临床前试验不足。用于TKR植入物临床前测试的传统关节运动模拟器可以操纵膝关节的力量、位移或模拟肌肉控制。然而,能够使用所有三种控制模式的钻机尚未在文献中描述。本研究旨在验证一种新的平台,肌肉致动器系统(MAS),它可以产生重力依赖,股四头肌控制的下蹲运动,代表牛津钻机膝关节模拟器,并安装在具有力/位移控制能力的关节运动模拟器上。合成膝关节模型包括改良的TKR植入物和关键的伸肌和屈肌机制类似物,但没有韧带。该组合系统实现了从模拟臀部到脚踝坐标的恒定力矢量,有效地复制了在牛津钻机中观察到的重力。测量股四头肌力量和髌股关节运动学来评估MAS的性能,这些测试显示出高水平的可重复性和再现性。在标称髌骨肌腱长度、髌骨上部和下部测量的力和运动学,与在相同条件下使用传统牛津钻机宾夕法尼亚州立膝关节模拟器(PSKS)测量的结果进行比较。在绝对运动学和肌肉力量方面存在分歧,但由于假体设计或髌骨肌腱长度的改变而产生类似的趋势。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
3.40
自引率
5.90%
发文量
169
审稿时长
4-8 weeks
期刊介绍: Artificial Organs and Prostheses; Bioinstrumentation and Measurements; Bioheat Transfer; Biomaterials; Biomechanics; Bioprocess Engineering; Cellular Mechanics; Design and Control of Biological Systems; Physiological Systems.
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