Cyamella
Description
Name
- Cyamella
- Popliteus sesamoid
- Sesamoid bone of the popliteus tendon
- Popliteal sesamoid bone
- Posterior knee sesamoid (non-specific, less precise)
General
- 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
Radiographic View
- Best seen on PA view of the knee
- Small ossicle in posterolateral knee
- Easily missed or misinterpreted
Epidemiology
- ~0.57% – 1.8% prevalence, Often cited as <2% overall[4]
- Can be unilateral or bilateral
- More common in less advanced primates, dogs[5]
Clinical Significance
- Typically asymptomatic, incidental
- May be confused as a fracture, loose body, calcific tendinopathy, avulsion fracture or fabella
Pathology
- Rarely a cause of posterolateral knee pain
- Symptomatic Cyamella
See Also
References
- ↑ 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.
- ↑ Benthien, Jan Philipp, and Alexander Brunner. "A symptomatic sesamoid bone in the popliteus muscle (cyamella)." Musculoskeletal surgery 94.3 (2010): 141-144.
- ↑ Prasad, Niharika, Manchikanti Venkatesh, and Kopuri Ajay Abishek. "Cyamella Sesamoiditis: A Rare Cause of Posterolateral Corner Knee Pain." Radiology 5.2 (2020): B106-B108.
- ↑ Berthaume, Michael A., and Anthony MJ Bull. "Cyamella (a popliteal sesamoid bone) prevalence: A systematic review, meta‐analysis, and proposed classification system." Clinical Anatomy 34.5 (2021): 810-820.
- ↑ Benthien JP, Brunner A. A symptomatic sesamoid bone in the popliteus muscle (cyamella). Musculoskelet Surg. 2010;94 (3): 141-4. doi:10.1007/s12306-010-0083-6