The best examples of ball and socket joints in the human body are the shoulder joint and hip joint. These are extremely mobile joints that allow the inserting bone, coming from the arms and legs, to move freely through a wide range of motion.
The ball and socket joint consists of two main components. The socket is a hollow cutout in one bone, like the pelvis, with a hemispherical-shaped depression. The second component is the top of the inserting bone, which is shaped like the top of a ball, allowing it to insert tightly into the socket. The hip joint consists of the rounded pelvis socket and the rounded femur bone.