Acetabular protrusio (also known as acetabular protrusion) is intrapelvic displacement of the acetabulum and femoral head, so that the femoral head projects medial to the ischioilial line. It should be differentiated from coxa profunda.
Protrusio acetabuli is divided into two types - primary and secondary.
Characterised by progressive protrusio in middle aged women. The condition may be associated with osteoarthritis and may be familial.
- Paget disease
- psoriatic arthropathy
- rheumatoid arthritis
- ankylosing spondylitis
- osteomalacia / rickets
- osteogenesis imperfecta
- Marfan syndrome
- haemophilia (in advanced arthropathy) 5
- intrapelvic displacement of the medial wall of the acetabulum
Diagnosis is made on the basis of an anteroposterior radiograph of the pelvis that demonstrates a centre-edge angle greater than 40 degrees and medialisation of the medial wall of the acetabulum past the ilioischial line (Kohler's line) 3.
- 1. Kuhlman JE, Scott WW, Fishman EK et-al. Acetabular protrusion in the Marfan syndrome. Radiology. 1987;164 (2): 415-7. Radiology (abstract) - Pubmed citation
- 2. Van De Velde S, Fillman R, Yandow S. The aetiology of protrusio acetabuli. Literature review from 1824 to 2006. Acta Orthop Belg. 2007;72 (5): 524-9. Pubmed citation
- 3. McBride MT, Muldoon MP, Santore RF et-al. Protrusio acetabuli: diagnosis and treatment. J Am Acad Orthop Surg. 2001;9 (2): 79-88. Pubmed citation
- 4. Femoroacetabular Impingement. Springer. ISBN:3642227686. Read it at Google Books - Find it at Amazon
- 5. Scharrer I, Schramm W. 34th Hemophilia Symposium Hamburg 2003. Springer Berlin Heidelberg. ISBN:B000PC6CJ6. Read it at Google Books - Find it at Amazon