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Accessory Bones of the Knee

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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]
Cyamella seen on both PA and lateral radiographs[2]

General

  • Accessory ossicles and sesamoids of the knee have been described
  • Currently, only 3 are well described in the literature

Os Fabella

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

Cyamella

  • Rare sesamoid bone of the knee
  • Exists as a normal anatomic variant within the popliteus tendon
  • Characteristically, it is located at the lateral aspect of the distal femur in the popliteal groove

Meniscal Ossicle

  • Accessory ossicle located within the meniscus
  • Uncommon and often incidental finding on imaging

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. ↑ Su, Shouwen, et al. "A symptomatic cyamella in the popliteus tendon causing snapping knee: a case report and literature review." BMC Musculoskeletal Disorders 20 (2019): 1-5.
  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
Created by:
John Kiel on 13 February 2025 17:22:30
Authors:
Last edited:
10 October 2025 00:34:13
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