What type of joint is the knee?

The knee joint is classified as a hinged joint, which is characterized by its ability to allow movement primarily in one plane, resembling the motion of a door hinge. This type of joint enables flexion and extension—bending and straightening of the leg, which is essential for various activities such as walking, running, and jumping.

The anatomy of the knee involves the femur (thigh bone), tibia (shin bone), and patella (kneecap), which work together to facilitate this uniaxial movement. In addition, while the knee does have some additional rotational capabilities, especially when it is flexed, its primary motion remains that of flexion and extension, reinforcing its classification as a hinged joint.

Recognizing the knee as a hinged joint is crucial for understanding its function and the mechanics of movements in activities involving the leg.