What type of joint are the knee and elbow examples of?

The knee and elbow are classified as hinge joints, which are characterized by their ability to allow movement predominantly in one plane, similar to the motion of a door opening and closing. This type of joint enables flexion and extension, which is the primary movement mechanism for both the knee and elbow.

In the case of the elbow, it connects the humerus to the radius and ulna, allowing the arm to bend and straighten. For the knee, it connects the femur to the tibia and fibula, facilitating movement during activities like walking, running, and jumping.

Hinge joints demonstrate a limitation of movement to a single axis, making them well-suited for actions that involve bending and straightening, supporting weight-bearing activities effectively. This functional characteristic highlights why the knee and elbow are not classified as pivot, saddle, or gliding joints, which allow different ranges and types of movement.