Algorithms in acetabular fracture classifications.

Acetabular fractures are still challenging fractures. Fracture classification is the basis for understanding these injuries and to gain treatment and to choose a fracture type-based treatment concept. Using a systematic step-wise concept of fracture analysis, based on specific radiographic lines on standard X-rays allow even less experienced surgeons to get a correct classification of the elementary and associated fracture types of Letournel's classification. Algorithmic analysis of the iliopectineal line, (anterior column involvement), ilioischial line (posterior column involvement), presence of a posterior wall fragment, fracture lines involving the iliac wing and inferior ramus, and the spur sign (representing associated both column fractures) allow for approximately 80-90% correct classifications using standard X-rays when integrating these lines into an algorithm. Especially, T-shaped fractures, ABC and ACPHT fractures may be difficult to classify. Thus, advanced imaging, such as CT scans with multiplanar reconstruction and 3D reconstructions is additionally recommended.