Which part of the body is the patella?

The patella is located directly anterior to the knee joint and is easily palpable on the body surface. When the knee is flexed, the bony, rounded prominence that can be felt is the patella—the largest sesamoid bone in the human body. It, together with the femur and tibia, forms the knee joint.

The patella’s surface and surrounding area are covered by fibrous connective tissue, allowing for a certain degree of gliding motion. The patellar ligament passes over its anterior surface and connects to it via this fibrous connective tissue. During knee extension, the patella acts as a lever fulcrum, enhancing mechanical efficiency and reducing the muscular effort required for extension.

The posterior surface of the patella forms the patellofemoral articular surface, which articulates with the femoral trochlea. During knee flexion and extension, the patella glides along the femoral trochlea, assisting in these movements.

The patella also serves a protective role for the knee joint. Damage to the patella may impair full knee extension. In daily life, repetitive activities such as running, jumping, weight-bearing, mountain climbing, or ascending/descending stairs subject the patella to excessive stress, potentially causing wear on its articular (posterior) surface and leading to chondromalacia patellae—a condition characterized by anterior knee pain during knee movement.