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Os Fabella

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Description

The right knee X-ray showed mild osteoarthritis with a significant fabella bone at the posterolateral side of knee[1]

Name

  • Os Fabella
  • Fabellae

History

  • Fabella is latin for "little bean" or faba "bean"[2]

General

  • Accessory ossicle almost always found in the lateral head of gastrocnemius
    • Rarely it is found in the medial head[3]
  • Can be osseous or fibrocartilaginous in nature
  • Articulates with the respective medial/lateral femoral condyle
  • Rarely, it is bipartite or tripartite
  • Can be mistaken for a loose body or osteophyte

Epidemiology

  • Found in approximately 20% - 39% of the population[4][5]
  • More common in men than women, older than younger (need citation)
  • High regional variation, more common in Asia/ Oceania, less common in North American and Africa (need citation)
  • Bilateral is more common than lateral

Fabellofibular Ligament

  • Ligamentous structure found within the posterolateral corner of the knee
  • Functions as a static secondary stabilizer with morphological variance

Clinical Significance


See Also


References

  1. Weng, Shuo-Po, et al. "Treatment of Fabella syndrome with arthroscopic fabellectomy: a case series and literature review." BMC Musculoskeletal Disorders 22 (2021): 1-7.
  2. William Alexander Newman Dorland. Dorland's Illustrated Medical Dictionary. (2007) ISBN: 9781416023647
  3. CHARLES J. SUTRO, MAURICE M. POMERANZ, SYDNEY M. SIMON. FABELLA (SESAMOID IN THE LATERAL HEAD OF THE GASTROCNEMIUS). (1935) Archives of Surgery. 30 (5): 777. doi:10.1001/archsurg.1935.01180110048003
  4. Kawashima T, Takeishi H, Yoshitomi S et-al. Anatomical study of the fabella, fabellar complex and its clinical implications. Surg Radiol Anat. 2007;29 (8): 611-6
  5. Berthaume, Michael A., Erica Di Federico, and Anthony MJ Bull. "Fabella prevalence rate increases over 150 years, and rates of other sesamoid bones remain constant: a systematic review." Journal of Anatomy 235.1 (2019): 67-79.
Created by:
John Kiel on 6 February 2025 20:55:33
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Last edited:
2 May 2025 13:52:07
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