Yamamoto Masataka, Shimatani Koji, Hasegawa Masaki, Murata Takuya, Kurita Yuichi
Hyogo Prefectural Awaji Medical Center: 1-1-137 Shioya, Sumoto-shi, Hyogo 656-0021, Japan.
Graduate School of Engineering, Hiroshima University, Japan.
J Phys Ther Sci. 2018 Aug;30(8):966-970. doi: 10.1589/jpts.30.966. Epub 2018 Jul 24.
[Purpose] The purpose of this study was to investigate the effect of changing the plantar flexion resistance of an ankle-foot orthosis on knee joint reaction and knee muscle forces. Furthermore, the influence of an ankle-foot orthosis with an over-plantar flexion resistance function on knee joint reaction force was verified. [Participants and Methods] Ten healthy adult males walked under the following three conditions: (1) no ankle-foot orthosis, and with ankle-foot orthoses with (2) a strong and (3) a weak plantar flexion resistance (ankle-foot orthosis conditions). The knee flexion angle, quadricep muscle force, hamstring muscle force, and knee joint reaction force during the stance phase were measured using a motion analysis system, musculoskeletal model, and ankle-foot orthosis model. [Results] The peak knee joint reaction force, knee flexion angle, and quadricep muscle force in the early stance phase significantly increased in the strong plantar flexion resistance condition in comparison with the "no ankle-foot orthosis" condition. [Conclusion] Increased knee joint reaction force with over-plantar flexion resistance suggests that over-plantar flexion resistance causes various knee problems such as knee pain and knee osteoarthritis.
[目的]本研究旨在探讨改变踝足矫形器的跖屈阻力对膝关节反应和膝关节肌肉力量的影响。此外，还验证了具有过度跖屈阻力功能的踝足矫形器对膝关节反应力的影响。[参与者与方法]10名健康成年男性在以下三种条件下行走：(1)不使用踝足矫形器，以及使用具有(2)强和(3)弱跖屈阻力的踝足矫形器(踝足矫形器条件)。在站立期，使用运动分析系统、肌肉骨骼模型和踝足矫形器模型测量膝关节屈曲角度、股四头肌力量、腘绳肌力量和膝关节反应力。[结果]与“不使用踝足矫形器”条件相比，在强跖屈阻力条件下，站立早期的膝关节反应力峰值、膝关节屈曲角度和股四头肌力量显著增加。[结论]过度跖屈阻力导致膝关节反应力增加，表明过度跖屈阻力会引发各种膝关节问题，如膝关节疼痛和膝关节骨关节炎。
