Os acetabuli
Last revised by Yuranga Weerakkody ◉ on 26 Jan 2022
Citation, DOI, disclosures and article data
Citation:
Knipe H, Weerakkody Y, Niknejad M, et al. Os acetabuli. Reference article, Radiopaedia.org (Accessed on 28 Sep 2023) https://doi.org/10.53347/rID-27959
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rID:
27959
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Disclosures:
At the time the article was created Henry Knipe had no recorded disclosures.
View Henry Knipe's current disclosuresLast revised:
26 Jan 2022, Yuranga Weerakkody ◉
Disclosures:
At the time the article was last revised Yuranga Weerakkody had no recorded disclosures.
View Yuranga Weerakkody's current disclosuresRevisions:
21 times, by 7 contributors - see full revision history and disclosures
Systems:
Sections:
Synonyms:
- Os acetabulum
- Os acetebulare
- Ossa acetabuli
- Acetabular ossicles
- Acetabular ossicle
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).
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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 4.
Differential diagnosis
In some situations consider:
References
- 1. Martinez AE, Li SM, Ganz R et-al. Os acetabuli in femoro-acetabular impingement: stress fracture or unfused secondary ossification centre of the acetabular rim?. Hip Int. 2010;16 (4): 281-6. Pubmed citation
- 2. Hergan K, Oser W, Moriggl B. Acetabular ossicles: normal variant or disease entity?. Eur Radiol. 2000;10 (4): 624-8. Pubmed citation
- 3. Hardy M, Snaith B. Musculoskeletal Trauma: a guide to assessment and diagnosis. Churchill Livingstone. ISBN:B0066BMSQG. Read it at Google Books - Find it at Amazon
- 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
- 5. Djaja Y, Kim S, Lee G, Ha Y. Acetabular Ossicles: Epidemiology and Correlation With Femoroacetabular Impingement. Arthroscopy. 2020;36(4):1063-73. doi:10.1016/j.arthro.2019.11.123 - Pubmed
- 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
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