The Influence of Rotational Acetabular Osteotomy(RAO) on Hip Abductor Function.

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We measured the isometric muscle force (IMF) of the hip abductors of 21 patients who underwent RAO pre- and postoperatively to assess the influence of this procedure on the hip joint.In each patient IMF of the hip abductors was measured using a device of our own design at four different positions of -15, 0, 15 and 30 degrees in abduction. At the same time simultaneous surface electromyogram (EMG) was recorded on the following four muscles, gluteus medius, adductor muscles, gluteus maximus and quadriceps femoris. The influence of RAO was studied by analyzing the sequential change of IMF and the pattern of muscle contribution to hip abduction power by calculating regression coefficients of integrated EMGs to hip abduction power.Maximum value of the muscle force of the hip abductors decreased up till 3 months after operation. Then it increased returning to the preoperative value at 9 months after surgery, in 15 and 0 degrees of abduction. However, in 15 and 30 degrees of abduction, recovery was delayed.The proportion of regression coefficients normalized from the OA pattern postoperatively, suggesting this procedure may act to normalize the muscle coordination around the hip joint.
西日本整形・災害外科学会の論文