Os acetabuli

Os acetabuli (plural: ossa acetabuli) is an unfused secondary ossification center 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:

• femoroacetabular impingement
• hip dysplasia
• osteochondrosis dissecans
• post-traumatic or degenerative bone fragments

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

Differential diagnosis

In some situations consider:

• acetabular labral calcification

Siehe auch:

• Verkalkungen des Labrum acetabuli