Fig. 12

Surgical procedure of the modified quadratus femoris bone graft. a Posterior hip approach; b Exposure of the quadratus femoris muscle; c Chiseling of the quadratus femoris bone flap. d Drilling into a Kirschner needle to mark the position of the bone groove; e Drilling of a bone slot with a ring saw; f Removal of dead bones around the groove. g Implantation of allogeneic bone; h Compaction of cancellous bone. i Embedding of the bone flap into the bone groove