The authors present their experience of acetabular fractures, as examined according to Harris’ recent (2004) CT based classification into four separate groups and relative sub-groups.

Each group is here represented as a completely documented clinical case, with pre and post-op roent-grams as well as axial and volume rendering CT imagery.

The Harris classification differs from the classic and 40 year old Letournel classification, basically ignoring the fracture complexity and focusing on the pattern of the fracture itself, with respect to column walls and extension beyond the acetabulum. It’s also possible to include some commonly seen fractures otherwise not classified by Letournel. Fracture comminution therefore is not a defining characteristic.

This topographic approach is easier for the surgeon to comprehend and memorize, thus facilitating pre-operative planning and the possibility of interdepartmental assessment of the fracture types.

Obviously, computerized tomography is the defining technique of this classification. The axial CT display of acetabular fracture patterns within the pelvis is furthermore confirmed by the 3D reformatted images.

This classification is loosely based on that of Tile and Helfet ; with the advantage of further simplifying the sub-groups from 27 to 16.

The Harris classification is simple and unambiguous, providing clear indications for both diagnosis and surgical treatment planning of this most complex chapter of Traumatology.