膝上假肢稳定性与运动学功能的评价

对多轴膝关节进行了分析，提出了承重稳定裕度角、全伸展位绝对瞬心距和相对瞬心距的概念，用于评价下肢假肢的稳定性和相对稳定性。通过对膝关节稳定协调区的讨论，说明了相对稳定性的概念和应用。多轴膝上假肢在摆动相能使小腿有更大的升高量，从而减小了脚在摆动相触地的可能性而具有特殊的优点。通过对这一性能的定量分析，提出了踝关节在摆动相的升高量作为评价这一性能的指标，进一步阐述膝关节功能的评估问题。该文提出的评价方法对膝上假肢设计及装配均有重要意义。

Study on stability and kinematic function of above knee prostheses

The stability is one of the main problems of study of the lower limb prostheses. Based on analyzing the knee joints of the four bar linkage, this paper presents the concepts of the stable well off angle, absolute and relative instantaneous distance. Those concepts are used to evaluate the characters of above knee (A/K) prosthesis. Through discussion of stable area of knee, the concept of the relative stability is explained. The multi axis A/K prostheses increase the clearance between the foot and the ground. Therefore the possibility of strike between foot and ground is reduced. On the basis of quantitative analysis, a concept of the rising amount of ankle during the swing phase is presented to describe the evaluation of the kinematic performance of the multi axis A/K prostheses. The evaluation method presented in this paper will have significance to design and assemble of A/K prosthese.