In human anatomy, what is the kneecap called?

In human anatomy, the kneecap is called the patella.

The patella is a small, roughly triangular sesamoid bone embedded in the quadriceps tendon at the front of the knee. Its lower point continues into the patellar ligament, which attaches to the tibia. This arrangement lets the quadriceps muscle group transmit force across the knee joint.

The patella protects the front of the knee and improves the leverage of the quadriceps during movements such as walking, climbing stairs, and standing up. Its smooth rear surface is covered with cartilage and articulates with the femur.

A common mix-up is to call the patella a separate long bone of the lower leg. The lower leg contains the tibia and fibula; the patella is part of the knee mechanism. Patellar dislocation and patellar tendinitis are distinct conditions affecting this bone and its surrounding tissues.