Wolf Erik J, Everding Vanessa Q, Linberg Alison L, Schnall Barri L, Czerniecki Joseph M, Gambel Jeffrey M
1Henry M. Jackson Foundation for the Advancement of Military Medicine, Bethesda, MD, USA.
J Rehabil Res Dev. 2012;49(6):831-42. doi: 10.1682/jrrd.2010.12.0234.
Adding active power to a prosthetic knee unit may improve function and reduce the potential for overuse injuries in persons with transfemoral amputation (TFA). Servicemembers who have sustained a TFA are often young and motivated to perform at high functional levels. The goal of this article is to compare the biomechanics of ramp and stair descent and ascent for participants using the C-Leg and the Power Knee (PK). Subjects were asked to ascend and descend an instrumented staircase and 12 degree ramp at their comfortable pace while equipped with retroreflective markers. Temporal-spatial and kinetic data were collected. Knee power generated by the nondisabled limb during stair ascent for subjects wearing the C-Leg was significantly greater than for those wearing the PK. Knee power generated by prosthetic knee units was significantly greater for subjects while wearing the PK. Although the PK reduced the power required from the nondisabled knee during stair climbing, it does not appear to be superior to the C-Leg for other tasks. Adding power to a prosthetic knee may reduce wear on the nondisabled limb; however, there are still limitations that require improvement.
为假肢膝关节增加主动动力可能会改善经股骨截肢（TFA）患者的功能，并降低过度使用损伤的可能性。遭受TFA的军人通常较为年轻，且有动力在高功能水平上表现。本文的目的是比较使用C-Leg和动力膝关节（PK）的参与者在斜坡和楼梯下降及上升过程中的生物力学。受试者在配备反光标记的情况下，被要求以舒适的步伐上下装有仪器的楼梯和12度斜坡。收集了时空和动力学数据。佩戴C-Leg的受试者在楼梯上升过程中健侧肢体产生的膝关节动力明显大于佩戴PK的受试者。佩戴PK时，假肢膝关节产生的动力对受试者来说明显更大。尽管PK在爬楼梯时减少了健侧膝关节所需的动力，但在其他任务中它似乎并不优于C-Leg。为假肢膝关节增加动力可能会减少健侧肢体的磨损；然而，仍存在需要改进的局限性。
