以欧拉角衡量膝关节运动稳定性初探

Preliminary Exploration into Measuring Stability of Knee Joint Movement with Euler Angles

目的以欧拉角衡量膝关节在三维空间的运动及其稳定性,为研究步态分类提供理论基础,为步态识别技术提供新的步态特征。方法使用Codamotion三维动作捕捉系统捕获受试者自然行走20趟的动作,导出左右膝关节各欧拉角(内收外展角度、内旋外旋角度、屈伸角度)的值,以此探讨膝关节的运动情况。结果同一人自然行走多趟膝关节欧拉角的Spearman相关性r有88.60%在高相关性程度范围内,有11.40%在显著相关性程度范围内。双足支撑阶段的后支撑腿和单足支撑阶段的摆动腿膝关节内收外展与屈伸运动的稳定性分别强于双足支撑阶段的前支撑腿和单足支撑阶段的支撑腿,而双足支撑阶段的前支撑腿和单足支撑阶段的支撑腿膝关节内旋外旋运动的稳定性则分别强于后支撑腿和摆动腿。结论同一人自然行走多趟膝关节运动具有一定的稳定性。

Objective To measure the motion and stability of knee joint in three-dimensional space with Euler angles so as to provide a theoretical basis for gait classification and recognition with new-discovered gait features.Methods The Codamotion three-dimensional motion capture system was used to record the movement and activity confine around the marked legs’sites of the subject who made 20 rounds of natural walking course,thereby having calculated the Euler angles(X:of adduction and abduction,Y:of internal and external rotation,Z:of flexion and extension)of left and right knee joints.The knee joints were therewith explored of their sports situation.Results Through Spearman analysis being conducted into the calculated Euler angles of knee joints from same person who made multiple rounds of walking course,the coefficient r was received with its 88.60% falling into high correlativity scope and the remaining 11.40% leaving among the significant correlation degree.During the period of single-foot/bipedal support,the swinging/rear-supporting leg led out more stable Euler angles X and Z of knee joint than the supportive/front-supporting leg whose Euler angle Y was yet more steady.Conclusion Same person,when naturally walking into rounds of course,is able to maintain his/her knee joint movement within a certain degree of stability.