Consider the marvelous physics of the human knee. The largest hinge joint in the body, it has two rounded bones held together ...

Consider the marvelous physics of the human knee. The largest hinge joint in the body, it has two rounded bones held together by ligaments that not ...

Hinge joints move in one direction, like doors, and are in knees, elbows, and fingers. Injuries or arthritis can cause pain and swelling in hinge joints, but ice and rest help reduce pain. Physical ...