Citation, DOI, disclosures and article data
Citation:
Radswiki T, Knipe H, Baba Y, et al. Acetabular protrusion. Reference article, Radiopaedia.org (Accessed on 27 Mar 2025) https://doi.org/10.53347/rID-12136
Disclosures:
At the time the article was last revised Henry Knipe had the following disclosures:
- Integral Diagnostics, Shareholder (ongoing)
- Micro-X Ltd, Shareholder (ongoing)
These were assessed during peer review and were determined to
not be relevant to the changes that were made.
View Henry Knipe's current disclosures
Acetabular protrusion, also known as protrusio acetabuli, is intrapelvic displacement of the acetabulum and femoral head, so that the femoral head projects medial to the ilioischial line. It should be differentiated from coxa profunda.
Acetabular protrusion is divided into primary and secondary types.
Primary
Primary acetabular protrusion is characterised by a progressive protrusion in middle-aged women. The condition may be associated with osteoarthritis and may be familial.
Secondary
Different diagnostic criteria have been suggested on an anteroposterior radiograph of the pelvis:
centre-edge angle greater than 40 degrees and medialisation of the medial wall of the acetabulum past the ilioischial line (Kohler's line) 3
acetabular fossa greater than 3 mm beyond the ilioischial line in men and greater than 6 mm in women 6
projection of the femoral head medial to the ilioischial line 7
A useful trick is that the acetabular cavity will often, but not always, be seen protruding medially to the iliopectineal line.
Complications of hip replacements include all of these except:
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