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Os acetabuli (plural: ossa acetabuli) are small ossicles adjacent to the acetabular roof regions and may represent an unfused secondary ossification center of the acetabulum or pathological sequelae (e.g. acetabular rim fracture, femoroacetabular impingement).
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:
- 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 4.
In some situations consider:
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- 4. Martinez AE, Li SM, Ganz R, Beck M. Os acetabuli in femoro-acetabular impingement: stress fracture or unfused secondary ossification centre of the acetabular rim?. (2006) Hip international : the journal of clinical and experimental research on hip pathology and therapy. 16 (4): 281-6. Pubmed
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- 6. Lund B. Os Acetabuli—a New Arthroscopic Treatment Option for the Acetabular Rim Fracture. Journal of Hip Preservation Surgery. 2021;8(Supplement_1):i46-50. doi:10.1093/jhps/hnab036 - Pubmed
- 7. Lund B. Os Acetabuli-A New Arthroscopic Treatment Option for the Acetabular Rim Fracture. J Hip Preserv Surg. 2021;8(Suppl 1):i46-50. doi:10.1093/jhps/hnab036 - Pubmed
- 8. Randelli F, Maglione D, Favilla S, Capitani P, Menon A, Randelli P. Os Acetabuli and Femoro-Acetabular Impingement: Aetiology, Incidence, Treatment, and Results. International Orthopaedics (SICOT). 2018;43(1):35-8. doi:10.1007/s00264-018-4151-0 - Pubmed