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Changes in load-bearing area after Ganz periacetabular osteotomy evaluated by multislice CT scanning and stereology.

BACKGROUND: We used a stereologic method based on 3D CT scanning to estimate the projected load-bearing surface in the hip joint.

PATIENTS AND METHODS: 6 normal hip joints and 6 dysplastic hips were examined. The latter were CT-scanned before and after periacetabular osteotomy.

RESULTS: We found that the average area of the projected load-bearing surface of the femoral head preoperatively was 7.4 (6.5-8.4) cm2 and postoperatively 11 (9.8-14) cm2, which was similar to the load-bearing surface in the normal control group. We performed double measurements and the coefficient of error of the mean was estimated at 1.6%. Due to overprojection, an overestimation of about 3.8% on the projected load-bearing surface occurred. Consequently, the stereologic method proved to be precise and unbiased.

INTERPRETATION: Our findings indicate that this method is of value for monitoring the load-bearing area in the hip joint of patients undergoing periacetabular osteotomy.

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