Objective: When performing total hip arthroplasty for osteoarthrosis secondary to hip dysplasia, we usually aim to fix the acetabular component in the area of the original acetabulum before deformation has occured resulting from superior migration of the femoral head. In cases where intraoperative bony coverage of the socket is less than three-fourths of the surface area of the cup, we construct block bone grafts from the resected femoral head and fix these to the acetabulum using metal screws. In this study we report the middle-term results of cementless sockets implanted using block bone grafts.

Materials and methods: 25 hip joints of 20 patients with follow-up of over 5 years were included in this study. The mean age at surgery was 50 years (range: 36 to 67). The femoral components were fixed with cement in 9 joints and without cement in 16 joints. Follow-up periods ranged from 5.0 years to 10.5 years (mean 7.5 years). X-rays were obtained and studied concerning incorporation and collapse of the bone graft, migration of the socket and peripheral osteolysis.

Results: Incorporation of the grafted bone was obtained in all cases. No socket migration and no collapse of the bone graft were observed. A localized absorption of grafted bone was seen in two asymptomatic cases.

Conclusion: Very good results were obtained with cementless sockets implanted with block bone grafts at a mean follow-up of 7.5 years.