足环节模型构建模式与踝关节角度参数变异性研究——人体常速平面行走的试验验证

Different Foot Models and Corresponding Variation on Ankle Joint Parameters:Experimental Verification of Human Normal Walking

目的:比较分析不同足环节模型构建模式与踝关节角度参数的变异性规律,针对性研究人体下肢及足环节运动时合理选择相关模型,并为正确定义环节角度参数提供理论依据。方法:在试验对象小腿环节和足环节特征点粘贴反光球,以构建国际通用的3种足环节模型和国内普遍使用的2种足矢量模型;通过三维影像捕捉系统获得反光球的三维空间坐标数据;由相关分析软件计算出人体常速平面行走过程中不同足模型产生的踝关节角度变化值。结论:数据验证与理论推理得出,足尖模型不适用于构造踝关节,跖趾关节模型只能应用于高配置运动捕捉实验室。因此,研究推荐使用跖趾模型。三点角和四点角是矢量模型,构造关节角度不准确且有较大误差。与环节角相比,三点角放大了踝关节角度,四点角缩小了踝关节角度变化范围,只适合一些特殊试验条件下的粗略研究。

Objective：The aim of this research is to study different foot models and their parameters varied mechanism on ankle joint angle,provide theoryreference for the research related to select pertinent model for human lower extremities,foot segment and give the correct definitions for segment angle. Meth-ods：The shanks and foots of subjects were pasted with reflective markers to construct 3 foot segment models used by international colleagues and 2 vector footmodels used by nationals. Conclusions：The Toe model was no suit for constructing ankle joint,MJoint model only suited for high equipped motion capture sys-tem and recommend Phalange model after theory and experimental verification. Three point model and four point models were vector models and have signifi-cant errors when constructing joint angle. Three point models enlarged the ankle joint angle. Four point models shrink the ankle joint angle,only suit for somespecial capture environment,compared with segment model.