Vascularized Distal Radius Bone Graft for Treatment of Ulnar Nonunion.

Various methods have been reported to treat forearm nonunions with good results. However, in the presence of infection, inadequate vascularity of surrounding tissues, or failed prior grafts, vascularized bone grafts are a valid alternative. We describe the surgical technique to obtain distal radius vascularized bone graft pedicled on the radial artery (RA) and its clinical application in 1 case of an ulnar nonunion. We studied the surgical technique in 12 freshly injected cadavers. In the distal forearm, the RA provides several periosteal branches to supply the distal radius metaphysis. These vessels are located between the distal insertion of the brachioradialis and the deep surface of the radial half of the pronator quadratus. A 6-cm vascularized bone graft can be harvested from the radius, and dissection of the RA enables a long pedicle with a wide arc of rotation readily able to reach the proximal part of the ulna. The present technique is a reproducible alternative that allows the treatment of bone defects up to 6 cm, without the potential technical difficulties of a free bone flap.