What is the name of the triangle-shaped bone located at the knee?

The triangle-shaped bone located at the knee is known as the patella. This bone is crucial for the function of the knee joint as it serves several important roles. Primarily, the patella protects the knee joint from trauma and improves the leverage of the thigh muscles during movement, such as walking, running, and bending the knee.

The patella articulates with the femur (thigh bone) and is held in place by tendons. It plays a significant role in the mechanics of knee extension; when the quadriceps (the large muscle group at the front of the thigh) contract, the patella glides over the inferior aspect of the femur, which aids in efficient movement of the knee.

The other bones mentioned—fibula, tibia, and femur—are important components of the leg but do not share the triangular shape or the specific location and function of the patella at the knee joint. The fibula is a slender bone located beside the tibia, which supports weight but is not weight-bearing itself. The tibia is the larger bone of the lower leg that supports the majority of the weight and articulates with the femur at the knee. The femur is the longest bone in the body,