Introduction and method
To enhance the rate of bone repair, injection of bone marrow in the necrosis was done during core decompression. The source of bone marrow was the iliac crest. A quantity of 150 ml was obtained by bone marrow aspiration. The whole marrow was concentrated using centrifugation to increase the cell concentration in an aliquot of 25 ml. Bone marrow was injected in the necrosis and in the femoral head by the hole of the core decompression. 42 hips with MRI avascular necrosis without collapse (stage 11) were operated with this technique between 1991 and 1993. The average follow up is 5 years.