What is the largest joint in the human body?

Not only is the knee the largest joint in the human body, it is also the most complicated, according to Inner Body. The knee is a hinge joint that is formed to move only on one axis.

The knee is reinforced with both internal and external ligaments to give it a wide range of motion. It is strong and durable enough to support the body's weight with only slight reinforcement from other bones. It acts as a shock absorber due to fibrocartilage that is between the femur and tibia. This fibrocartilage protects the bones when running or doing other flexion activities.