Anterior column fractures separate a segment of anterior acetabulum from the rest of the innominate bone. The fracture starts from the middle of the ischiopubic ramus below, and then passes through the anterior acetabulum.
Classification of anterior column fractures
The proximal extension of this fracture passes variably through the innominate bone, at different levels above the acetabulum, as far upwards as the middle third of the iliac crest.
Anterior column fractures are described by the level of their proximal extent. They may also be segmental.