Protrusio Acetabuli

Protrusio acetabuli – another way of saying acetabular protrusion. It refers to the inward bulging of the acetabulum into the pelvis usually with resultant over-covering of the femoral head. The deformity may be due to trauma but in many cases it is a sign of an underlying disease such as rheumatoid arthritis, ankylosing spondylitis, rickets, Paget’s disease and osteogenesis imperfecta. The patient below had Marfan syndrome.

Image from Radiopaedia.org (link)

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