Functional performance after tibial rotationplasty.

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Abstract
We measured muscle strength, joint motion, and gait parameters and determined the electromyographic activities of the ankle and knee during walking, running, and stair-climbing in two children who had had a tibial rotationplasty for osteosarcoma of the distal end of the femur. Both had marked loss of strength in the plantar flexors on the side of the prosthesis compared with the sound side, although electromyographic recordings showed that the rotated calf muscles, to a substantial degree, had assumed the function of extensors of the prosthetic knee. Despite some abnormalities in gait, both children walked at speeds that were comparable to those of normal children. They could also run, climb stairs by stepping up with both limbs, and participate in many recreational activities. The functional abilities of these children suggested that rotationplasty, in patients with a similar lesion, is a worth-while alternative to above-the-knee amputation.

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