الفهرس 
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Abstract
Patients with severe fractures of the acetabulum often have significant associated injuries and a high rate of mortality. When these patients arrive in the emergency department they are often haemodynamically unstable and urgent decisions are required before beginning treatment. An accurate and reliable imaging-base classification system of these fractures is needed to guide management.
Portable pelvis x-ray is a screening tool to determine if the patient has a fracture. The sensitivity of pelvic radiography is low (55%), and it is not reliable for determining if the acetabular injury is stable or not
The main advantages of MDCT are the fast scan acquisition which is very important in trauma patients because it reduce motion artifacts, and the high spatial resolution that vastly improved bony details. A tremendous amount of diagnostic data is gathered from the helical scan, which can be reconstructed, into 2D and 3D images. Thin slice axial MDCT images are needed for 2D and 3D image reconstructions. When imaging acetabular fractures, the axial images obtained in MDCT clarify the fracture pattern, the presence of joint fragments, marginal impaction, and the status of the femoral head as well as associated pelvic fractures. It is also effective in the evaluation of associated minor degrees of sacroiliac joint displacement, sacral fractures, crushing or shearing injuries, and other more subtle pelvic ring injuries.
Many classification system were used to classify acetabular fractures including Judet and Letournel, the Orthopedic Trauma Association (OTA)/Ar¬beitsgemeinschaft für Osteosynthesefragen (AO) scheme as well as a more recent classifica¬tion system proposed by Harris et al. The most widely used classification system is the Judet and Letournel classification system which is a radiographic analysis for interpreting acetabular fractures by analysis of lines formed by cortical surfaces parallel to the x-ray beam on AP and 45° oblique pelvic radiographs.
The aim of this work was to assess the role of multi-detector CT in evaluation and classification of traumatic acetabular fractures.
The MDCT examination was performed to all the patients in this study using 16 detector MDCT scanner (Bright speed GE medical systems). For each acetabular MDCT image of the studied group (30 patients) was evaluated for the following: site of fractures, number of fractures, type of fractures (non displaced, displaced), displaced bony fragments and its locations, injury of other pelvic joints (symphsis pubis, sacroiliac joints, hip joints) and acetabular fracture classification, based on Judet and Letournel classification systemas well as associated soft tissue injury.