Acetabular retroversion and protrusio
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Pelvis and Bilateral Hip X-ray
No imaging is available for comparison.
Mild coxa valga deformity of bilateral femora is demonstrated with mild coxa magna. There is a crossover sign of the acetabulum bilateral consistent with acetabular retroversion. Lucency at the junction of the right femoral head and neck laterally may be secondary to impaction (impingement). In addition there is mild protrusio, the inner margin of the acetabulum passing deep to the ilioischial line.
Acetabular retroversion is a form of acetabular dysplasia and can lead hip pain from adolescence to middle age and to early osteoarthritis.
In this case the medial margin of the acetabulum passes medial to the ilioischial line although the centre edge angel is normal indicating mild protrusio.
- D. Reynolds, J. Lucas, K. Klaue, Retroversion of the acetabulum: a cause of hip pain, J Bone Joint Surg [Br] 1999;81-B:281-8.