The author has operated on 50 immature rabbits to perform a vascularised transplantation of the growing iliac crest to replace the rim of the acetabulum. Vascularity was preserved through the vascular pedicle and there was no need for vascular anastomosis. The results were assessed radiologically and by histological studies. The subsequent growth of the transplanted epiphysis could be illustrated in 15 out of 16 cases. The growing shelf had the advantage of good adaptation to the shape of the femoral head and produced a satisfactory physiological result.