Acetabular protrusion

Last revised by Henry Knipe ◉ on 28 Sep 2023

Citation, DOI, disclosures and article data

Citation:

Radswiki T, Knipe H, Baba Y, et al. Acetabular protrusion. Reference article, Radiopaedia.org (Accessed on 24 Mar 2025) https://doi.org/10.53347/rID-12136

DOI:

https://doi.org/10.53347/rID-12136

Permalink:

https://radiopaedia.org/articles/12136?embed_domain=external.radpair.com%27%5B0%5D

rID:

12136

Article created:

24 Oct 2010, The Radswiki ◉

Disclosures:

At the time the article was created The Radswiki had no recorded disclosures.

View The Radswiki's current disclosures

Last revised:

28 Sep 2023, Henry Knipe ◉

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

Revisions:

25 times, by 15 contributors - see full revision history and disclosures

Systems:

Musculoskeletal

Synonyms:

Acetabular protrusio
Acetabular protrusion
Protrusio acetabuli

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.

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.