Abstract
Introduction: We studied resphericity of the collapsed femoral head moved medially after posterior rotational osteotomy for osteonecrosis at a mean of 8.5 years follow-up.
Materials and Methods: Twenty-eight hips in 24 patients with osteonecrosis with apparent collapse treated by this operation were studied. All hips had no recollapse at final follow-up. The mean age of patients was 26 years. Twenty-two hips were non-traumatic, 6 were traumatic. The resphericity was studied by ratio (%, medial area of collapse/hip center to superior viable joint surface) at less than 6 months, 3years, and at final follow-up on postoperative antero-posterior radiographs. Disappearance of the subchondral fracture was also observed.
Results and Discussion: The mean ratio of the medial collapse area was 18.4% at less than 6 months, 8.3% at 3years, and 3.4% at final follow-up. Subchondral fracture was seen in 25 of 28 hips at less than 6 months, subchondral fractures disappeared in 17 hips at 3 years, and in 23 hips at final follow-up. We thought that remodeling of the postoperative medial collapsed lesion occurred after this operation.
The abstracts were prepared by Lynne C. Jones, PhD. and Michael A. Mont, MD. Correspondence should be addressed to Lynne C. Jones, PhD., at Suite 201 Good Samaritan Hospital POB, Loch Raven Blvd., Baltimore, MD 21239 USA. Email: ljones3@jhmi.edu
