We measured isometric muscle force of the hip abductor to evaluate the influences of the surgery to the hip.
Measurement was done on eleven patients with osteoarthritic hip treated by rotational acetabular osteotomy, using a new device of our own design pre- and postoperatively. The force was measured at four different degree in adduction-abduction position such as fifteen degrees in adduction, neutral, fifteen and thirty degrees in abduction. An abduction force was evaluated on maximum value and durability.
Maximum value within six months after operation shwed less than that of preoperative one at any position, and they recovered to preoperative values over six months after operation at fifteen degrees adducted and neutral position. On the other hand at fifteen degrees and thirty degrees abducted posotion did not. Durability was increased within six months after operation, and then the variation between each position became small over six months after operation.
