الفهرس 
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Abstract
Acetabular fractures represent a complex injuries of the hip joint associated with high morbidity. Restoration of joint congruency plays an important role in treatment outcome. However, development of post-traumatic osteoarthritis can occur even after anatomical reconstruction. Development of post-traumatic arthritis leads to painful stimuli and impairment of hip joint function. In such cases further surgery in the form of total hip arthroplasty is recommended.
The estimated ratio of post-traumatic OA is 15-67% and that of the post-traumatic necrosis of the femoral head is 15-20% although they frequently occur combined.
The reason for late femoral head necrosis is the traumatic dislocation of the hip joint compromising the blood supply to the femoral head (immediate reduction is absolutely indicated even in poly-trauma or severely injured patients).
Secondary OA may be caused by incongruent joint surfaces, direct lesions to the cartilage of the femoral head and/or acetabular joint surface, intra-articular bony fragment, surgical implants in the joint causing secondary damage to the cartilage and avascular necrosis of the femoral head.
Total hip arthroplasty after failed acetabular fracture management is a challenging procedure. Retained internal fixation implants, heterotopic bone formation, scar tissue, osteonecrosis of bone fragments, remaining pelvic deformity, protection of the sciatic nerve, and difficulties with obtaining reliable component fixation make the THA more difficult.
In order to pre-plan the reconstructive surgery, it is essential to determine the extent of the bony defect and/or of the pseudoarthrosis. Preoperative planning can be performed well based on two dimensional (2D) or 3D CT-scans. A