具备内外旋自由度的双侧减压辅具对膝关节生物力学的影响

The biomechanical effect on knee joint from bilateral unloading knee brace with internal-external rotation

目的针对传统膝关节辅具对人体下肢运动自由度限制的问题,为辅具提供一种顺应膝关节内外旋自由度的设计方案。方法通过在辅具中增加双自由度铰链的设计释放内外旋自由度,设置佩戴具备和不具备双自由度铰链的双侧减压辅具实验组、未佩戴辅具对照组进行步态及力学实验测试。结果步态过程中,相比不具备双自由度铰链的辅具,具备双自由度铰链的辅具对膝关节内外旋运动的限制较小,且辅具可以为人体膝关节提供一定牵引力。结论顺应内外旋自由度的设计方案可以有效减少双侧减压辅具对膝关节运动的限制。

Objective Aiming at reducing the restrictions on lower limbs imposed by traditional knee brace, a de- sign scheme for knee brace complying with internal-external rotation is proposed. Methods By adding the inter- nal-external hinge, the knee brace could help to release the degree of freedom （DOM） of internal-external rota- tion of the knee. In the experimental group, the subject was required to wear the bilateral unloading knee brace with or without internal-external hinges, respectively, while in the control group, the subject did not wear the knee brace. Then gait experiment and mechanical testing were conducted. Results In gait experiment, the bilateral unloading knee brace with internal-external hinges imposed less restriction on the knee than that from the knee brace without internal-external hinges, and it could also provide some distractive force for the knee joint. Conclu- sions The internal-external hinge design can help to reduce restrictions on the knee imposed from bilateral unloa- ding knee brace.