Robust estimation of dominant axis of rotation

JOURNAL OF BIOMECHANICS

卷:40

Article

Chang, Lillian Y. ; Pollard, Nancy S.

关键词: axis of rotation;    joint models;    optimization;   

DOI  :  10.1016/j.jbiomech.2007.01.010

来源: Elsevier

【 摘 要 】

A simple method is developed for robustly estimating a fixed dominant axis of rotation (AoR) of anatomical joints from surface marker data. Previous approaches which assume a model of circular marker trajectories use plane fitting to estimate the direction of the AoR. However, when there is limited joint range of motion and rotation due to a second degree of freedom, minimizing only the planar error can give poor estimates of the AoR direction. Optimizing a cost function which includes the error component within a plane, instead of only the component orthogonal to a plane, leads to improved estimates of the AoR direction for joints which exhibit additional rotational motion from a second degree of freedom. Results from synthetic data validation show the ranges of motion where the new method has lower estimation error compared to plane-fitting techniques. Estimates of the flexion-extension AoR from empirical motion capture data of the knee and index finger joints were also more anatomically plausible. (c) 2007 Elsevier Ltd. All rights reserved.

【 授权许可】

Free