Mechanical and dynamic characterization of prosthetic feet for high activity users during weighted and unweighted walking.
Mechanical and dynamic characterization of prosthetic feet for high activity users during weighted and unweighted walking.
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DOI：
10.1371/journal.pone.0202884
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发表时间：
2018
期刊：
影响因子：
3.7
通讯作者：
Hansen AH
中科院分区：
文献类型：
--
作者：
Koehler-McNicholas SR;Nickel EA;Barrons K;Blaharski KE;Dellamano CA;Ray SF;Schnall BL;Hendershot BD;Hansen AH
许多服务成员和退伍军人与下肢截肢有潜力的高功能和愿望恢复体力要求的职业，需要他们携带沉重的负荷（例如，军人、消防员、农民、牧场主、建筑工人）。然而，目前尚不清楚哪种假足最适合负重，同时在负重活动期间也提供良好的整体功能和移动性。本研究的主要目的是通过检查机械特性（即，前足刚度）和动态功能（即，摇杆半径、有效脚长比和后期站立能量返回）。使用伺服液压测试架和测力传感器获得了9个假肢踝足系统的载荷与挠度曲线。有效的翻身形状特征和后期的立场能量返回措施，然后获得使用定量步态分析的三个用户与单侧，经胫骨截肢。从机械和动态测试的结果表明，虽然前足刚度在本研究中调查的九只脚，在翻转形状半径和有效脚长比测量的变化相对较小的加权行走。与此同时，与具有更坚硬的前足龙骨结构的脚相比，具有更柔顺的前足龙骨结构的假脚似乎提供了更多的后期站立能量返回。这些结果表明，具有顺应性前足龙骨结构的假肢踝足系统可以通过降低体力要求高的活动的代谢成本来更好地适应负重行走。然而，为了更充分地理解这些结果的生物力学和功能影响，还应考虑其他因素，例如使用者的残肢强度和假足的整体刚度。
Many Service members and Veterans with lower-limb amputations have the potential for high function and the desire to resume physically demanding occupations that require them to carry heavy loads (e.g., military service, firefighters, farmers, ranchers, construction workers). However, it is currently unclear which prosthetic feet best accommodate heavy load carriage while also providing good overall function and mobility during unweighted activities. The main objective of this study was to investigate the ability of currently available prosthetic ankle-foot systems to accommodate weighted walking by examining the mechanical characteristics (i.e., forefoot stiffness) and dynamic function (i.e., rocker radius, effective foot length ratio, and late-stance energy return) of prosthetic feet designed for high activity users. Load versus deflection curves were obtained for nine prosthetic ankle-foot systems using a servohydraulic test frame and load cell. Effective roll-over shape characteristics and late-stance energy return measures were then obtained using quantitative gait analysis for three users with unilateral, transtibial amputation. Results from mechanical and dynamic testing showed that although forefoot stiffness varied across the nine feet investigated in this study, changes measured in roll-over shape radius and effective foot length ratio were relatively small in response to weighted walking. At the same time, prosthetic feet with more compliant forefoot keel structures appeared to provide more late-stance energy return compared to feet with stiffer forefoot keel structures. These results suggest that prosthetic ankle-foot systems with compliant forefoot keel structures may better accommodate weighted walking by reducing the metabolic cost of physically demanding activities. However, to more fully understand the biomechanical and functional implications of these results, other factors, such as the residual-limb strength of the user and the overall stiffness profile of the prosthetic foot, should also be considered.
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影响因子：
2.4
作者：
Birrell, Stewart A.;Haslam, Roger A.
通讯作者：
Haslam, Roger A.
影响因子：
2.4
作者：
Quesada, PM;Mengelkoch, LJ;Simon, SR
通讯作者：
Simon, SR
影响因子：
1.8
作者：
Fey, Nicholas P.;Klute, Glenn K.;Neptune, Richard R.
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Neptune, Richard R.
影响因子：
1.2
作者：
Knapik, JJ;Reynolds, KL;Harman, E
通讯作者：
Harman, E
DOI：
10.1682/jrrd.2010.01.0003
发表时间：
2010-01-01
影响因子：
--
作者：
Klodd, Elizabeth;Hansen, Andrew;Edwards, Mark
通讯作者：
Edwards, Mark