Moments About Body Centered Coordinate Axes At Limb Joints From Force Plate And Biplane Photography Measurements

S. Balakrishnan; A. B. Thornton-Trump; G. W. Brodland

doi:10.1117/12.966052

12 July 1983 Moments About Body Centered Coordinate Axes At Limb Joints From Force Plate And Biplane Photography Measurements

S. Balakrishnan, A. B. Thornton-Trump, G. W. Brodland

Author Affiliations +

Proceedings Volume 0361, Biostereometrics '82; (1983) https://doi.org/10.1117/12.966052
Event: 26th Annual Technical Symposium, 1982, San Diego, United States

Abstract

Traditional locomotion analysis considers motion in a translating coordinate frame and the analysis is performed primarily in the sagittal plane. The results of several studies in the present work have shown that the aspect of symmetry is rarely present in pathological gait. Loss of function in one plane of movement gives rise to larger motions in other planes. This brings into focus the necessity for three dimensional measurement for adequately representing pathological gait. Description of quantities associated with gait in the appropriate moving frame of each segment would be closer to joint angulation of limb segments. Although this description has been attempted by a few researchers, the assumption of small angle theory and vectorial addition of rotation angles commonly employed for defining the rotation matrices is not applicable to pathological gait. The present work illustrates the use of biplane photography for displacement measurement in human movement. Transformations based on Eulerian angle rotations are derived based on biplane measurements. From the three dimensional ground reaction forces measured by a force plate, moments about the moving upper body coordinate axes are computed through a three dimensional mathematical model.

Citation Download Citation

S. Balakrishnan, A. B. Thornton-Trump, and G. W. Brodland "Moments About Body Centered Coordinate Axes At Limb Joints From Force Plate And Biplane Photography Measurements", Proc. SPIE 0361, Biostereometrics '82, (12 July 1983); https://doi.org/10.1117/12.966052

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