The study was approved by the Institutional Review Board. Hence, we studied degrees of medial, anterior and posterior acetabular roof arc angles by using ABSAWBA as a reference for reconsidering about the most appropriate degrees of acetabular roof arc angles of the previous studies without involvement of the ABSAWBA of the femoral head. 9, 10, 11 If there is any pathology at ABSAWBA including fractures, the articular cartilage is deteriorated and leads to osteoarthrosis hip. Pauwels described superior acetabular subchondral bone density area above the femoral head as anatomic biomechanical superior acetabular weight bearing area (ABSAWBA) of the femoral head. 8 The three studies confirmed only 45° of medial acetabular roof arc angle, but anterior and posterior roof arc angles were quite different and created controversial recommendation. 7 Chuckpaiwong and Harnroongroj studies acetabular roof arc angles of anatomic superior acetabular weight bearing dome showing <46° medial, 52° anterior and 62° posterior roof arc angles involved superior weight bearing area of acetabulum. have demonstrated that medial, anterior and posterior acetabular roof arc angles of <45°, 25° and 70° involved weight bearing portion and created instability. 5, 6 A biomechanical study of acetabular coverage and hip stability of Vrahas et al. 3, 4 Roof arc angle is a method to evaluate adequate acetabular coverage and stability of the femoral head, Matta and Merritt study based on clinical findings and suggested that the fracture crosses acetabular weight bearing dome when <45° medial, anterior and posterior roof arc angles. 1, 2 Moreover, stability of the hip depends on adequate acetabular coverage of the femoral head. Acetabular fracture involving superior weight bearing area shows significantly poor results. The principles of management of acetabular fracture is a restoring both intraarticular fracture and adequate acetabular coverage for femoral head to achieve congruent stable hip.
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