[Bioelectric activity of the gluteus medius muscle after total McKee-Farrar hip replacement]

Electromyography of the gluteus medius muscle in arthritic patients after total McKee-Farrar hip replacement has been presented. The control group consisted of nonoperated arthritic hips and normal hips. It was found that arthritis of the hip or total hip replacement do not significantly influence the average score of the integrated gluteus medius electomyogram. The gluteus medius strength on Trendelenburg sign testing is 1.5-2 times greater than on acting against maximal resistance with patient in supine position.