Wertheim and Bohlman method of occipitocervical fusion. A, Burr is used to create ridge in external occipital protuberance, and hole is made in ridge. B, Wires are passed through outer table of occiput, under arch of atlas, and through spinous process of axis. C, Grafts are placed on wires. D, Wires are tightened to secure grafts in place. SEETECHNIQUE 41.6.