Biomechanical Comparison of the Quadrilateral and the NSNA Prosthetic Limb Sockets

R. B. DAVIS, S. OUNPUU,D. TYBURSKI, AND C. BOOMUS


Kinetic (forces) and kinematics (motions) of the gait of an above-knee amputee were examined to compare performance with a quadrilateral and a Natural Shape/Normal Alignment socket. Biomechanical comparisons included limb segment angular orientation (or displacements), velocities, and accelerations; limb segment linear accelerations; ground force reaction patterns; and moments (or torques) generated at each lower-limb joint. Furthermore, to measure the forces generated at the amputation limb/socket interface during gait, miniature strain gauge pressure transducers were inserted into the interface space (Davis 1986). These quantities provided an indication of the differences in control, stability, and comfort associated with the two socket shapes.

Davis RB: The Measurement of Prosthetic Limb Socket Pressure, The Proceedings of the Eighth Annual IEEE/Engineering in Medicine and Biology Society Conference. 18461949,1986.

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