Protrusio acetabuli

Radswiki et al.

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.

Primary

Characterised by progressive protrusio in middle aged women. The condition may be associated with osteoarthritis and may be familial.

Secondary
  • 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.

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Article information

rID: 12136
Section: Gamuts
Synonyms or Alternate Spellings:
  • Acetabular protrusio
  • Acetabular protrusion

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Cases and figures

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    Case 1: protrusion from hip prosthesis
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    Case 2: with pincer impingement
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    Pelvis
    Case 3: with Marfan syndrome
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    Case 4: with osteomalacia
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    Case 5: with RA
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    Case 6
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    Case 7
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