A cam-locking orthopedic fixation device for anchoring a bone graft in a bore formed in a bone mass. The device has a head, a nose remote from the head, and a body, extending between the head and the nose, with a series of threaded crests only partially circumferentially surrounding the body. At least...http://www.google.co.uk/patents/US5454811?utm_source=gb-gplus-sharePatent US5454811 - Cam lock orthopedic fixation screw and method
