Mass and mass distribution of below-knee prostheses: Effect on gait efficacy and self-selected walking speed
Mass and mass distribution of below-knee prostheses: Effect on gait efficacy and self-selected walking speed
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DOI：
10.1016/s0003-9993(98)90293-3
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发表时间：
1998-02-01
影响因子：
4.3
通讯作者：
Negretot, A
中科院分区：
文献类型：
--
作者：
Lehmann, JF;Price, R;Negretot, A
目的：探讨质量及质量分布对膝下假体功能的影响。设计：进行设计修改以产生近端质量中心定位与远端质量中心定位的变化，并将假体重量从正常肢体重量的42%修改为70%。对受影响和未受影响肢体的关节进行比较，以评估假体替代功能丧失的能力。单位：大学生物力学实验室。参与者：15名志愿者，膝下截肢，残肢长度大于8.3cm，但不包括赛姆截肢。干预措施：患者以自行选择的步行速度和120m/min步行。主要观察指标：自选步行速度和代谢效率。工作横跨关节的影响和未受影响的两侧进行比较。结果：近端质心定位可提高步态效率。体重从正常的42%变化到70%没有明显的效果。力学研究表明，该假肢是一个相对较差的替代正常肢体。桅杆工作由未截肢的一侧完成。特别是，由于摆动腿的推离和减速，假体无法在身体上产生有效的向前脉冲。结论：对于近端质量中心，应使用轻质远端部件（如足）；进一步投入资金开发超轻假肢是否具有成本效益是值得怀疑的。(C) 1998年由美国康复医学大会和美国物理医学与康复学会颁发。
Objective: To study mass and mass distribution effect on function of below-knee prostheses.Design: Design modifications were done to produce proximal center of mass location versus distal center of mass location variations, and prosthesis weight was modified from 42% to 70% of normal limb weight. Work across joints of affected and unaffected extremities was compared to assess the ability of the prosthesis to substitute for function loss.Setting: University biomechanics laboratory.Participants: Fifteen volunteers with below-knee amputations, residual limb length greater than 8.3cm, but excluding Syme amputations.Interventions: Patients walked with all configurations at self-selected walking speeds and 120m/min.Main Outcome Measures: Self-selected walking speed and metabolic efficiency. Work across the joints of affected and unaffected sides was compared.Results: Proximal center of mass location produced a more efficient gait. Weight change from 42% to 70% of normal bad no significant effect. Mechanical studies show that the prosthesis is a relatively poor substitute for the normal limb. mast work is done by the nonamputated side. Particularly, the prosthesis failed to produce effective forward impulses on the body, resulting from push-off and deceleration of the swing leg.Conclusions: For a proximal center of mass, lightweight distal components (eg, feet) should be used; it is questionable whether further expenditure to develop ultralightweight prostheses would be cost effective lot level walking. (C) 1998 by the American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation.