Os Acetabuli

Description

Radiographic Dunn view of a symptomatic left hip. The radiograph reveals a large os acetabuli and associated cam lesion

Illustration of Os Acetabuli

Name

• Os Acetabuli
• Ossa acetabuli
• Os cotyloideum
• Os coxae quartum
• Os acetabuli secundarium

General

• Small ossicles adjacent to the acetabular roof
• May represent unfused secondary ossification center of the acetabulum or pathologic sequelae

Gross Anatomy

• Located at the anterior/superior margin
• Rounded, well corticated with a concave lateral/ convex medial border
• Can be bilateral, partially fused to the acetabulum
• Commonly seen in children, typically fuse and are uncommonly seen in adults

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Clinical Significance

Related Pathology

• Femoroacetabular Impingement
• Hip dysplasia
• Osteochondrosis dissecans
• Post-traumatic or degenerative bone fragments

Differential Diagnosis

• Acetabular labral calcification

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See Also

• Hip Anatomy Main
• Radiology Main
• Accessory Bones Main

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