Acetabular protrusio (also known as acetabular protrusion) is intrapelvic displacement of the medial wall of the acetabulum.
Protrusio acetabuli is divided into two types, primary and secondary.
Primary protrusio acetabuli
Characterized by progressive protrusio in middle aged women, May be associated with OA and May be familial.
Secondary protrusio acetabuli
- Paget's disease
- psoriatic arthropathy
- rheumatoid arthritis
- ankylosing spondylitis
- osteomalacia / rickets
- osteogenesis imperfecta
- Marfan syndrome
- 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 center-edge angle greater than 40 degrees and medialization of the medial wall of the acetabulum past the ilioischial line.3
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- 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 (2006). "The aetiology of protrusio acetabuli. Literature review from 1824 to 2006". Acta Orthop Belg 72 (5): 524–9. PMID 17152413
- 3. McBride MT, Muldoon MP, Santore RF, Trousdale RT, Wenger DR (2001). "Protrusio acetabuli: diagnosis and treatment". J Am Acad Orthop Surg 9 (2): 79–88. PMID 11281632
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