Can extra bone be present on one side of both legs?

Q. What is the reason for an extra bone on one side of both the legs?

Answered by
Dr. Sumit Chawla
and medically reviewed by iCliniq medical review team.
This is a premium question & answer published on Sep 08, 2016 and last reviewed on: Jul 26, 2023

Hi doctor,

I am an 18-year-old male. My brother and I seem to have an extra bone on one side of both legs. I had this from my childhood, but there is no unique pain in it. Recently, I found that other people do not have that extra bone. Here is the picture for your reference. May I know the reason for this? Please explain.

#

Hi,

Welcome to icliniq.com.

The extra bone is a sesamoid bone called fabella or cyamella. These sesamoid bones are normal anatomical variants. They are nonfunctional in humans. They do not cause any symptoms unless there is a fracture or constant irritation of the region by external pressure causing sore or bursitis formation.

Thank you.


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