Kaufman K R, Levine J A, Brey R H, Iverson B K, McCrady S K, Padgett D J, Joyner M J
Motion Analysis Laboratory, Mayo Clinic, Rochester, MN 55905, USA.
Gait Posture. 2007 Oct;26(4):489-93. doi: 10.1016/j.gaitpost.2007.07.011. Epub 2007 Sep 14.
Microprocessor-controlled knee joints appeared on the market a decade ago. These joints are more sophisticated and more expensive than mechanical ones. The literature is contradictory regarding changes in gait and balance when using these sophisticated devices.
This study employed a crossover design to assess the comparative performance of a passive mechanical knee prosthesis compared to a microprocessor-controlled knee joint in 15 subjects with an above-knee amputation. Objective measurements of gait and balance were obtained.
Subjects demonstrated significantly improved gait characteristics after receiving the microprocessor-controlled prosthetic knee joint (p<0.01). Improvements in gait were a transition from a hyperextended knee to a flexed knee during loading response which resulted in a change from an internal knee flexor moment to a knee extensor moment. The participants' balance also improved (p<0.01). All conditions of the Sensory Organization Test (SOT) demonstrated improvements in equilibrium score. The composite score also increased.
Transfemoral amputees using a microprocessor-controlled knee have significant improvements in gait and balance.
微处理器控制的膝关节十年前出现在市场上。这些关节比机械关节更复杂、更昂贵。关于使用这些复杂装置时步态和平衡的变化，文献观点相互矛盾。
本研究采用交叉设计，评估15名大腿截肢患者使用被动机械膝关节假体与微处理器控制膝关节的对比性能。获得了步态和平衡的客观测量结果。
接受微处理器控制的假膝后，受试者的步态特征有显著改善（p<0.01）。步态改善表现为在负重反应期间从膝关节过度伸展转变为屈曲，导致膝关节内收肌力矩转变为伸肌力矩。参与者的平衡也得到改善（p<0.01）。感觉组织测试（SOT）的所有条件下平衡分数均有改善。综合分数也有所增加。
使用微处理器控制膝关节的大腿截肢患者在步态和平衡方面有显著改善。
