Bending and Straightening the knee are typical hinge
joint function
The pivot joint at the elbow allows the lower arm to turn palm-upward
The best example of the saddle joint's freedom of movement is at the thumb
This is the most flexible free moving joint and is found at the shoulder and hip
THE MAJORITY OF THE BODY'S JOINT ARE CALLED FREE-MOVING, OR SYNOVIAL, JOINTS. INSIDE EACH IS A CAVITY FILLED WITH FLUID, WHICH LUBRICATES THE JOINT EACH TIME YOU MOVE IT. THE JOINT IS HELD TOGETHER BY TOUGH STRAPS CALLED LIGAMENT, WHICH PREVENT THE BONES FROM DRIFTING APART AS THEY MOVE. THERE ARE FOUR COMMON KINDS OF FREE MOVING JOINT, EACH OF WHICH ALLOWS A DIFFERENT DEGREE OF MOVEMENT.
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