Vascularisation of the head of the radius in the adult.

Although rare, ischemic necrosis of the head of the radius after fracture is a theoretic possibility. The epiphyseal vascularisation of the proximal end of the radius was studied by dissection and diaphanisation techniques. The main extra-osseous supply is derived from epiphyseo-metaphyseal arteries given off by the recurrent radial a. and the first collateral of the ulnar a. These, to the number of three or four, anastomose together in a peri-cervical arterial circle continuous with the periosteal vessels of the shaft. From the proximal part of this network there arise three main intra-epiphyseal branches, which traverse the head, but nearly the entire periphery of the osteochondral junction is the site of small periosteal branches penetrating the head, though to no great depth. When the head of the radius is fractured, the commonest displacement is posterolateral, and the main vessel-bearing periosteal layer probably remains intact.