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.