Dependence of EMG-Reaction Times of the Rectus Femoris on Position Changes of the Hip Joint — Role of the Joint Capsule —

Abstract

EMG-reaction times (EMG-RTs) of the rectus femoris in midposition (M) and internally rotated position (IR) of the right hip joint were examined in nine control subjects and nine patients who had lost most of the capsule of a hip joint after total hip joint replacement procedure. In both groups EMG-RTs of the rectus femoris were faster at IR than at M. The difference of EMG-RTs between M and IR was essentially the same in the two groups. It is assumed that information from proprioceptors in the joint capsule may not play an important role in postural dependence of EMG-RTs of the muscle. © 1980, Tohoku University Medical Press. All rights reserved.