9/28/2023 0 Comments Superior acetabular![]() The acetabular version can be measured precisely on CT/MRI in the axial plane, where it is formed by a line perpendicular to the horizontal axis of the pelvis, and a line connecting the most anterior and posterior points of the acetabular margin. anterior center-edge angle (Lequesne angle): >20° indicates anterior overcoverage.alpha angle: >55° indicates a cam morphology.acetabular index (Tönnis angle): >13° indicates hip dysplasia, while values close to or less than 0° is caused by acetabular overcoverage.lateral center-edge angle (Wiberg angle): 30–40° signals acetabular overcoverage.Quantitative measures of acetabular orientation and coverage (on radiographs): posterior wall sign (deficiency of the posterosuperior wall).ischial spine sign (ischial spine projects medially to the pelvic brim).crossover sign (anterosuperior rim seemingly extends laterally to the posterosuperior rim).Proper assessment of the acetabular configuration necessitates perfectly centered AP radiographs of the pelvis, which should be the first diagnostic imaging test to assess acetabular retroversion. developmental (see: acetabular dysplasia).It is also a risk factor for early-onset osteoarthritis of the hip, as the decreased area and poor orientation of the posterior acetabular wall result in the formation of stress zones with increased wear and inhomogeneous load distribution throughout the articular surface 1,2. Acetabular retroversion is a form of pincer morphology and predisposes to femoroacetabular impingement. The condition is most often caused by an abnormal prominence of the anterosuperior part of the acetabular rim, rather than a shallow posterosuperior rim, entailing a partial overcoverage of the femoral head. It occurs in 16 to 25% of dysplastic hips and affects 31 to 49% of patients with Legg-Calvé-Perthes disease, and 36 to 76% of those diagnosed with slipped femoral epiphysis 2. ![]() ![]() Acetabular retroversion is a common abnormality affecting 5 to 20% of the general population. ![]()
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