Arthroplasty for congenital hip dislocation. Techniques for acetabular reconstruction.

We investigated a series of 63 arthroplasties for chronically dislocated hips or severe dysplasia with at least two thirds of the femoral head uncovered. Direct cementation into the neoacetabulum at the pelvic wing was followed by 6/20 revision arthroplasties and 3/20 impending failures. Cups supported by cortical bone grafts were revised in 8/16 and found loose in 2/12 arthroplasties. The best technique was restoration of the rotational center of the hip joint and roof reconstruction with a femoral head graft with 2/25 revisions and signs of loosening in 2/25.