Raw Rollover Shape Data.

Changing footwear often presents a challenge for lower extremity prosthesis users. When prosthesis alignment is completed by the Certified Prosthetist, the prosthetic foot is set at an angle accommodating a single shoe heel rise (shoe heel height minus forefoot height); deviation from this heel rise causes misalignment of the prosthesis. To address this problem, the Rehabilitation & Engineering Center for Optimizing Veteran Engagement & Reintegration (RECOVER) has developed a modular ankle-feet system allowing for the use of footwear of varying heel rises without the need for realignment by the prosthesis user. The primary aim of this study was to understand if clinically acceptable prosthesis alignment is maintained as prosthesis users change between modular foot-shoe sets. Three women transtibial prosthesis users self-selected three pairs of footwear with a heel rise up to 10 cm. Using the modular prosthetic ankle-feet system, participants completed five walking trials per foot-shoe set in the motion analysis laboratory. Reflective markers were used to track the location of the prosthetic socket during walking. These data in combination with center of pressure measurements were used to calculate ankle-foot-shoe rollover shapes and the location of the origin of the best-fit circle for each rollover shape. The locations of the resulting best-fit circle origins indicate prosthesis alignment is maintained within clinically acceptable parameters as users change between foot-shoe sets. These findings have implications for improving footwear options for people with lower-extremity amputations.

下肢假肢使用者在更换鞋履时常面临挑战。当由认证假肢师（Certified Prosthetist）完成假肢对线调试时，假肢足的角度会被设置为适配单一鞋跟高度差——即鞋跟高度减去前掌高度的差值；若偏离该鞋跟高度差，便会引发假肢对线偏差。为解决这一问题，优化退伍军人参与与再融合康复工程中心（Rehabilitation & Engineering Center for Optimizing Veteran Engagement & Reintegration，缩写RECOVER）研发了一款模块化踝足系统（modular ankle-feet system），可允许假肢使用者在无需自行重新调试假肢对线的情况下，使用不同鞋跟高度差的鞋履。本研究的首要目标为明确：当下肢假肢使用者在不同模块化足-鞋组合间切换时，能否维持临床可接受的假肢对线状态。研究招募了3名经胫骨截肢的女性假肢使用者，由其自主选择3双鞋跟高度差最高达10cm的鞋履。借助该模块化假肢踝足系统，受试者在运动分析实验室中，针对每一套足-鞋组合完成5次行走测试。通过反光标记点追踪行走过程中假肢接受腔（prosthetic socket）的位置，并结合压力中心（center of pressure）测量数据，计算得到踝-足-鞋滚动轨迹形状（rollover shapes），以及各滚动轨迹形状对应的最佳拟合圆（best-fit circle）原点位置。研究结果显示，当使用者在不同足-鞋组合间切换时，所得最佳拟合圆的原点位置表明，假肢对线可维持在临床可接受的参数范围内。该研究结果可为下肢截肢人群拓展鞋履选择范围提供理论支撑。