VISUALISATION OF THE SHORT EXTERNAL ROTATOR MUSCLE INSERTIONS ON THE GREATER TROCHANTER USING 3D-CT

BackgroundIn total hip arthroplasty (THA), preservation of the short external rotator muscles are considered to be important because they contribute to joint stability and prevent postoperative dislocation. Recently, we reported that there are bony impressions on the greater trochanter that indicate the insertions of the short external rotator tendons. In this study, we reported a method to visualize the bony impressions using preoperative CT images, and evaluate the reliability and accuracy of this method.MethodsThirty-three hips from 24 consecutive patients undergoing THA were enrolled. The mean age was 65.3 years. Preoperative diagnoses included hip osteoarthritis in 27 hips, rheumatoid arthritis in 4 hips, idiopathic osteonecrosis in 1 hip, femoral neck fracture in 1 hip. Preoperative CT of the hip region was obtained and three-dimensional (3D) reconstruction of the greater trochanter was performed to visualize the bony impressions, that we called the obturator tendon attachment (OTA), indicating the ...