Below-knee amputee knee extension force-time and moment characteristics

Abstract

This study, utilizing isometric knee extension, was undertaken to determine if significant differences existed between extremities of below-knee amputees and matched normal subjects in minimal time to production of peak force, maximal rate of tension development, and maximal extension moment. Results showed no significant differences for rate of tension development. Significance at the .05 level was established for moments produced by left amputees and their contralateral limb, and right and left limbs of normal subjects. Differences in time to 95 percent of peak force for the amputated leg were also significant when compared to the limb of the matched normal subject. Results indicate that quadriceps tension and rate of tension development are both factors to emphasize in therapeutic programs, particularly for the left knee of the below-knee amputee.