A long-term evaluation has been made of the effect of drilling and bone-grafting for aseptic necrosis of the femoral head with or without union of the fractured femoral neck, idiopathic aseptic necrosis of the femoral head, and aseptic necrosis of the femoral head caused by traumatic dislocation. One hundred and twelve patients were followed for from two to fifteen years. The results show that the procedure is effective in restoring viability to the necrotic femoral head and continuity to the ununited femoral-neck fracture in a sufficient number of patients (78.4 per cent) to warrant its continued use in the management of these complications.