We describe a new operative technique for reconstruction of deficient acetabular bone which allows the implantation of the socket of a total hip replacement at the level of the true acetabulum. The results of 61 such operations in 50 patients are reviewed. The average follow up was 45 months (minimum 36 months). All grafts had united by 6 months and there was no failure of the bone grafts or acetabular loosening. The clinical results are encouraging. Special attention is paid to the use of an L-shaped graft taken from the femoral head and neck.

"Minimaly-invasive" total joint arthroplasty have been widely introduced to the orthopaedic community several years ago. The concept has received a great attention and has been greeted variably with enthusiasm, concern, and skepticism. Numerous meetings, scientific exibits, symposia and congreses has been taking place all around the world. Whether this represents the future of orthopaedic surgery or just a fad, the term "minimaly-invasive" or "minimaly-incision" are yet to be clear and establish. Our intention is to present 72 of first 100 cases of total hip arthroplasty performed by "minimaly-incision" surgery. In our opinion first results are positve and we intend to continue with this kind of surgery.

Between 1971 and 1985, 461 adult patients were treated by Chiari's pelvic osteotomy with medial displacement. Of these, 161 patients (171 hips) were followed up for an average of 9 years. The average age at operation was 29 years. We describe five groups of painful dysplastic hips in which the operation is indicated. Clinical evaluation by Colton's rating system gave 84% of excellent, good or fair results. Radiographs showed that the secondary osteoarthritic changes were arrested in 73%, improved in 11% and that there was deterioration in 16%. Pain was largely or completely relieved in 87%, the range of movement was maintained in 80% and the gait improved in 77% of our cases. The late results were better in younger patients. We conclude that improved biomechanical conditions are responsible for good congruency of the joint which is preserved for a long time.