Types of freely movable joints
There are four types of freely movable joints:
Ball and socket joint: Permitting movement in all directions, the ball and socket joint features the rounded head of one bone sitting in the cup of another bone. Examples include your shoulder joint and your hip joint.
Hinge joint: The hinge joint is like a door, opening and closing in one direction, along one plane. Examples include your elbow joint and your knee joint.
Pivot joint: The pivot joint, also called the rotary joint or trochoid joint, is characterized by one bone that can swivel in a ring formed from a second bone. Examples are the joints between your ulna and radius bones that rotate your forearm, and the joint between the first and second vertebrae in your neck.
Gliding joint: The gliding joint is also called the plane join. Although it only permits limited movement, it’s characterized by smooth surfaces that can slip over one another. An example is the joint in your wrist.