抄録
Recently, some reports demonstrate the usefullness of the magnetic resonance imaging (MRI) for early diagnosis of the avascular necrosis of the femoral head (ANF). In this report we analysed 64 hips in 40 cases using preoperative plain radiographs, tomography and MRI affected by ANF. And we gained following three conclusions.
1. When rotational osteotomy of the femoral head is to be carried out, two plain views of MRI, parallel and contrary to the axis of the femoral neck, were useful for evaluation of postoperative weight bearing area.
2. In 58 hips with strinct the former two plain views of MRI, atrophy of posterior area of the femoral head was recognized in 54 hips by tomography, and of them abnormal signal in posterior was revealed in 32 hips by MRI.
3. In 28 hips performed anterior rotational osteotomy, atrophy of posterior area of the femoral head was recognized in 26 hips by tomography, and of them abnormal signal in posterior was revealed in 6 hips by MRI. In such cases careful follow-up should be required.
