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A member asked:
What happens if the patella is a sesamoid then why does it articulate with the femur?
A doctor has provided 1 answer
That's normal: Sesamoid bones are usually small bones that are incorporated into a tendon on ligament near a joint. They increase the mechanical advantage of the muscle making it easier to move the affected joint. The patella is the largest sesamoid bone which pushes against the femur. Everyone also have sesamoid bones under your big toe and your thumb. They can occur at other joints as well.
Answered 1/4/2015
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