Fabella is the small calcification appears back of femoral condyles
The fabella (Latin for little bean) (or flabella) is a small sesamoid bone found in some mammals embedded in the tendon of the lateral head of the gastrocnemius muscle behind the lateral condyle of the femur. It is a variant of normal anatomy and present in humans in 10% to 30% of individuals. Rarely, there are 2 or 3 of these bones (fabella bi- or tripartita). It can be mistaken for a loose body or osteophyte.
In approximately 10% of the population (mostly women), a small bean shaped sesmoid bone called the fabella is embedded in the lateral head of the gastronomius. 
The fabella is a standard finding on radiographs of the dog and cat, and both medial and lateral fabellae are typically present.
- Duncan W, Dahm D (2003). "Clinical anatomy of the fabella". Clin Anat 16 (5): 448–449. doi:10.1002/ca.10137. PMID 12903068.
- Platzer, Werner (2015). Color Atlas of Human Anatomy, Vol. 1: Locomotor System (7th ed.). Thieme. ISBN 978-3-13-533306-9.
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