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Os acetabuli

Os acetabuli (plural: ossa acetabuli) is an unfused secondary ossification center of the acetabulum.

Ossa acetabuli are located at the anterosuperior margin. They are rounded in shape with a concave lateral border and convex medial border. They may be bilateral and partially fused to the acetabulum.

Ossa acetabuli are normally seen in children but typically fuse in mid-to-late teens, being uncommonly seen in adults.

Ossicles in the acetabular region may also be found in: 

Some consider those present in dysplastic hips to represent fatigue fractures of the acetabular rim due to overload 4

In some situations consider:

Anatomy: Lower limb

Anatomy: Lower limb

Article information

rID: 27959
Section: Anatomy
Synonyms or Alternate Spellings:
  • Ossa acetabuli
  • Os acetebulare
  • Os acetabulum

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Cases and figures

  • Case 1
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  • Case 2: with pistol grip deformity (arrow)
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  • Case 3: bilateral os acetabuli with left pistol grip deformity
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  • Case 4
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  • Case 5: with femoroacetabular impingement - cam-type
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  • Case 6
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