Your elbow and knee are examples of
Your elbow and knee are examples of joints. In human anatomy, joints are the connections between bones that allow for movement and provide mechanical support. Both the elbow and the knee are considered hinge joints, which means they enable movement primarily in one plane, much like the way a door moves on its hinges.
The elbow joint connects the upper arm bone (humerus) to the two bones of the forearm (radius and ulna), allowing for flexion and extension.
The knee joint connects the thigh bone (femur) to the shin bone (tibia), with the kneecap (patella) situated at the front to protect the joint. It is a more complex joint than the elbow because it also has to support the weight of the body, and it includes a small amount of rotation in addition to flexion and extension movements.