impingement

Those were my words, when I was told I had a Fabella bone in my knee.

A Fabella bone is an extra sesamoid bone, located laterally, behind the knee. Only about 10% of the population has a Fabella bone. It is embeded at the head of the Gastrocnemius tendon. It is about the size of a pea and is very difficult to see on xray. Believe it or not, this little bone is susceptable to arthritis, fracture, dislocation and impingement.