Effects of Prosthetic Mass Distribution on Metabolic Costs and Walking Symmetry
Effects of Prosthetic Mass Distribution on Metabolic Costs and Walking Symmetry
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DOI：
10.1123/jab.29.3.317
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发表时间：
2013-06-01
影响因子：
1.4
通讯作者：
Martin, Philip E.
中科院分区：
文献类型：
--
作者：
Smith, Jeremy D.;Martin, Philip E.
单侧经胫骨截肢者表现出步行不对称性，步行时的代谢消耗高于以相似速度步行的非截肢者。使用轻质假肢以前曾被认为是导致行走不对称的一个因素。目的是研究假体质量和质量分布对6名单侧经胫骨截肢者的代谢成本和行走不对称性的影响。当在肢体的不同位置增加质量时，运动学和时间对称性没有改善。姿势和摆动时间不对称性分别增加了3.4%和7.2%，与负载位于肢体远端。最大膝盖角速度不对称性随着质量增加到大腿而增加6%，而最大大腿角速度不对称性随着质量定位在假体踝部附近而增加约10%。将完整腿与假体腿之间的估计质量差的100%添加到假体踝部使行走的能量消耗增加12%;将相同的质量添加到假体质量中心或大腿质量中心分别增加大约7%和5%的代谢成本。除非通过增加假体质量获得其他益处，否则不应将其视为目前用于单侧截肢者的轻质假体设计的可能替代方案。
Unilateral, transtibial amputees exhibit walking asymmetries and higher metabolic costs of walking than nonamputees walking at similar speeds. Using lightweight prostheses has previously been suggested as a contributing factor to walking asymmetries. The purpose was to investigate the effects of prosthesis mass and mass distribution on metabolic costs and walking asymmetries among six unilateral, transtibial amputees. Kinematic and temporal symmetry did not improve when mass was added at different locations on the limb. Stance and swing time asymmetries increased by 3.4% and 7.2%, respectively, with loads positioned distally on the limb. Maximum knee angular velocity asymmetries increased by 6% with mass added to the thigh, whereas maximum thigh angular velocity asymmetries increased by approximately 10% with mass positioned near the prosthetic ankle Adding 100% of the estimated mass difference between intact and prosthetic legs to the ankle of the prosthesis increased energy costs of walking by 12%; adding the same mass to the prosthesis center of mass or thigh center of mass increased metabolic cost by approximately 7% and 5%, respectively. Unless other benefits are gained by increasing prosthesis mass, this should not be considered as a possible alternative to current lightweight prosthesis designs currently being prescribed to unilateral amputees.