Childers Walter Lee, Gregor Robert J
Georgia Institute of Technology, Atlanta, GA 30332-0356, USA.
Prosthet Orthot Int. 2011 Dec;35(4):373-8. doi: 10.1177/0309364611423129. Epub 2011 Oct 13.
Few published reports exist regarding the control of the human/prosthesis interface in persons with unilateral transtibial amputation.
To investigate strategies employed by prosthetic users in controlling the human/prosthesis interface to highlight challenges associated with either the amputation or the design of the prosthesis.
Randomized controlled trial.
Cycling was used as the locomotor task to allow for better control of task mechanics compared to walking. A group of nine cyclists with intact limbs were compared to eight cyclists with transtibial amputation (CTA) during a simulated cycling time trial. The CTA group pedaled with a stiff and flexible prosthetic foot. Reaction forces between the foot and the pedal were measured using an instrumented pedal system. The force effectiveness (FE) ratio was used as the measure of task performance. The FE ratio is the force component normal to the bicycle crank arm divided by the resultant force for both limbs and is commonly used to analyze pedaling technique.
The CTA group was equally as effective at applying forces as the intact group.
These data suggest that individuals with lower limb loss are able to compensate for their amputation to utilize a similar pedaling technique for locomotor performance. As global strategies, e.g. force effectiveness, appear similar between groups future research should focus on local strategies, e.g. individual joint kinematics and kinetics.
关于单侧胫骨截肢患者的人体/假肢界面控制，已发表的报告很少。
研究假肢使用者控制人体/假肢界面所采用的策略，以突出与截肢或假肢设计相关的挑战。
随机对照试验。
与步行相比，使用骑行作为运动任务，以便更好地控制任务力学。在模拟骑行计时赛中，将一组9名肢体健全的自行车骑行者与8名胫骨截肢的自行车骑行者（CTA）进行比较。CTA组使用刚性和柔性假脚蹬踏。使用仪器化踏板系统测量脚与踏板之间的反作用力。力效率（FE）比用作任务表现的衡量指标。FE比是垂直于自行车曲柄臂的力分量除以双下肢的合力，常用于分析蹬踏技术。
CTA组在施加力方面与健全组同样有效。
这些数据表明，下肢缺失的个体能够补偿截肢影响，采用类似的蹬踏技术实现运动表现。由于两组之间的整体策略（如力效率）似乎相似，未来研究应侧重于局部策略，如个体关节的运动学和动力学。
