Segmental analysis in kinesiological measurements

Zvi Ladin; Peter K. Mansfield; Michael C. Murphy; Robert W. Mann

doi:10.1117/12.23894

1 August 1990 Segmental analysis in kinesiological measurements

Zvi Ladin, Peter K. Mansfield, Michael C. Murphy, Robert W. Mann

Proceedings Volume 1356, Image-Based Motion Measurement; (1990) https://doi.org/10.1117/12.23894
Event: Image-Based Motion Measurement, 1990, La Jolla, CA, United States

Abstract

Biomechanical analysis of motion is based on the approximation of skeletal segments as rigid links moving through space, interconnected through a series of low-friction joints. Measurement systems that are aimed at capturing the spatial trajectories of body segments usually involve a camera system that tracks a series of body-fixed markers. Using stereophotogramxnetric cameras, the planar projections of markers at each camera are used to reconstruct the spatial coordinates of each marker. The derivation of segmental kinematics (i.e. linear translation and angular orientation) necessary to document the motion of the body segments has been done in most cases by attaching the markers to anatomic landmarks, and using geometric assumptions to characterize the spatial motion of given limbs. For example, by tagging the hip, knee and ankle statements have been made about the motion of the knee joint, and therefore the shank and thigh segments. This approach suffers from serious shortcomings, including the approximation of body segments as lines (as opposed to rigid bodies), the underlying assumption that axes of rotation remain constant throughout the motion, and that joint centers can be tagged by skin-mounted markers.

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Zvi Ladin, Peter K. Mansfield, Michael C. Murphy, and Robert W. Mann "Segmental analysis in kinesiological measurements", Proc. SPIE 1356, Image-Based Motion Measurement, (1 August 1990); https://doi.org/10.1117/12.23894

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