Bionic ankle-foot prosthesis normalizes walking gait for persons with leg amputation
Bionic ankle-foot prosthesis normalizes walking gait for persons with leg amputation
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DOI：
10.1098/rspb.2011.1194
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发表时间：
2012-02-07
影响因子：
4.7
通讯作者：
Grabowski, Alena M.
中科院分区：
文献类型：
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作者：
Herr, Hugh M.;Grabowski, Alena M.
随着时间的推移，腿假体在设计上有所改进，但不能以与生物肢体相当的方式主动适应不同的行走速度。与非截肢者相比，使用这种市售被动弹性假体的腿部截肢者需要显著更多的代谢能量来以相同的速度行走，更喜欢走得更慢，并且具有异常的生物力学。已经开发了一种仿生假肢，其在平地行走期间模拟生物踝关节的功能，特别是提供一系列行走速度所需的净正功。我们比较了代谢能量成本，首选的速度和生物力学模式的七个人与单侧经胫骨截肢使用仿生假肢和使用自己的被动弹性假肢的七个非截肢者在平地行走。与使用被动弹性假肢相比，使用仿生假肢平均降低了8%的代谢成本，增加了57%的后腿假肢机械功，减少了10%的主要生物腿机械功，步行速度为0.75-1.75 m s（-1），并将首选步行速度提高了23%。使用仿生假肢导致代谢能量消耗，偏好的行走速度和生物力学模式与没有截肢的人没有显著差异。
Over time, leg prostheses have improved in design, but have been incapable of actively adapting to different walking velocities in a manner comparable to a biological limb. People with a leg amputation using such commercially available passive-elastic prostheses require significantly more metabolic energy to walk at the same velocities, prefer to walk slower and have abnormal biomechanics compared with non-amputees. A bionic prosthesis has been developed that emulates the function of a biological ankle during level-ground walking, specifically providing the net positive work required for a range of walking velocities. We compared metabolic energy costs, preferred velocities and biomechanical patterns of seven people with a unilateral transtibial amputation using the bionic prosthesis and using their own passive-elastic prosthesis to those of seven non-amputees during level-ground walking. Compared with using a passive-elastic prosthesis, using the bionic prosthesis decreased metabolic cost by 8 per cent, increased trailing prosthetic leg mechanical work by 57 per cent and decreased the leading biological leg mechanical work by 10 per cent, on average, across walking velocities of 0.75-1.75 m s(-1) and increased preferred walking velocity by 23 per cent. Using the bionic prosthesis resulted in metabolic energy costs, preferred walking velocities and biomechanical patterns that were not significantly different from people without an amputation.