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Effect of Vastus Medialis Loss on Rabbit Patellofemoral Joint Contact Pressure Distribution.
Journal of Applied Biomechanics ( IF 1.4 ) Pub Date : 2020-08-25 , DOI: 10.1123/jab.2020-0056
Seong-Won Han 1 , Andrew Sawatsky 1 , Azim Jinha 1 , Walter Herzog 1, 2
Affiliation  

Vastus medialis (VM) weakness is thought to alter patellar tracking, thereby changing the loading of the patellofemoral joint (PFJ), resulting in patellofemoral pain. However, it is challenging to measure VM force and weakness in human studies, nor is it possible to measure the associated mechanical changes in the PFJ. To obtain fundamental insight into VM weakness and its effects on PFJ mechanics, the authors determined PFJ loading in the presence of experimentally simulated VM weakness. Skeletally mature New Zealand White rabbits were used (n = 6), and the vastus lateralis, VM, and rectus femoris were stimulated individually through 3 custom-built nerve cuff electrodes. Muscle torque and PFJ pressure distribution were measured while activating all muscles simultaneously, or when the vastus lateralis and rectus femoris were activated, while VM was not, to simulate a quadriceps muscle strength imbalance. For a given muscular joint torque, peak pressures were greater and joint contact areas were smaller when simulating VM weakness compared with the condition where all muscles were activated simultaneously. The results in the rabbit model support that VM weakness results in altered PFJ loading, which may cause patellofemoral pain, often associated with a strength imbalance of the knee extensor muscle group.



中文翻译:

股内侧肌损失对兔髌股关节接触压力分布的影响。

股内侧肌 (VM) 无力被认为会改变髌骨轨迹,从而改变髌股关节 (PFJ) 的负荷,导致髌股疼痛。然而,在人类研究中测量 VM 力和弱点具有挑战性,也不可能测量 PFJ 中相关的机械变化。为了从根本上了解 VM 弱点及其对 PFJ 力学的影响,作者在实验模拟 VM 弱点的情况下确定了 PFJ 负载。使用骨骼成熟的新西兰白兔(n = 6),通过 3 个定制的神经袖带电极分别刺激股外侧肌、VM 和股直肌。在同时激活所有肌肉时,或者在激活股外侧肌和股直肌而未激活 VM 时,测量肌肉扭矩和 PFJ 压力分布,以模拟股四头肌肌肉力量不平衡。对于给定的肌肉关节扭矩,与所有肌肉同时激活的情况相比,模拟 VM 无力时的峰值压力更大,关节接触面积更小。兔子模型的结果支持 VM 无力导致 PFJ 负荷改变,这可能导致髌股疼痛,通常与膝伸肌群的力量不平衡有关。

更新日期:2020-08-25
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