Os acetabuli

Dr Yuranga Weerakkody and Dr Henry Knipe et al.

Os acetabuli is an unfused secondary ossification centers of the acetabulum.

Gross anatomy

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.

Related pathology

Ossicles in the acetabular region may also be found in: 

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

Anatomy: Lower limb
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Article information

rID: 27959
Section: Anatomy
Synonyms or Alternate Spellings:
  • 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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