The patella or kneecap is a circular bone with a downward apex that is the starting point of the patellar ligament. It is the largest sesamoid bone in the body, a necessary factor as it supports the body’s weight during multiple regular activities. The kneecap is embedded in the tendon of the quadriceps, helping the muscle to increase its pull on the tibia. The bone allows smooth movement between tibia and femur, and acts as a shield, protecting both from direct fracture.

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