Prevalence and impact of pain at the greater trochanter after open surgery for the treatment of femoro-acetabular impingement.

BACKGROUND

Femoro-acetabular impingement can cause pain and degenerative changes of the hip joint. Traditionally, surgical dislocation of the hip joint has been performed for correction of pathologic abnormalities in the proximal part of the femur and the acetabulum. Failures of surgical treatment are often related to postoperative pain in the groin or in the area of the greater trochanter, associated with this surgical approach. The aim of our study was to determine the prevalence and functional impact of pain at the greater trochanter after surgical dislocation of the hip.

METHODS

Fifty consecutive patients in whom femoro-acetabular impingement had been treated with surgical dislocation of the hip at our institution were seen for clinical and radiographic follow-up at one year. The Merle d'Aubigné score was calculated preoperatively and at the time of follow-up. Pain in the groin or at the greater trochanter during activity and at rest was recorded.

RESULTS

The mean Merle d'Aubigné score significantly improved from 14.4 points preoperatively to 17 points postoperatively. Preoperatively, eight patients (16%) had pain over the greater trochanter. At one year after surgery, twenty-three (46%) had such pain; these patients were primarily female (seventeen of the twenty-three). The mean Merle d'Aubigné score was 17.4 points for the patients without groin pain and 16.1 points for those with groin pain. The presence or absence of pain at the greater trochanter had no significant influence on the outcome, but groin pain was associated with inferior results.

CONCLUSIONS

Tenderness or pain over the greater trochanter is frequent after osteotomy of the greater trochanter and has a distinct female predominance. However, it has no significant negative influence on outcome. This is in contrast to groin pain, which is associated with inferior results.