At the request of our publishers, I accepted the task of preparing this second edition. I felt this was necessary for several reasons: new imaging technologies such as CT scanning and 3-D reconstructions are now used routinely, the in­ dications for employing improved approaches are clearer, and reconstructions are facilitated by new internal fixation devices. Above all, I thought it was time to report the long-term results of the 940 acetabular fractures, 90070 of which were treated surgically - a unique series. In spite of the experience acquired from the three previous reviews of cases (1966, 1971, and 1978), I failed to foresee the amount of time this revision would need.