An articulation between two bones; that is, the point of connection between two bones or elements of a skeleton; especially, if the articulation allows motion.

An area where two bones are attached for the purpose of moving body parts.

An articulation, or joint, is usually formed of fibrous connective tissue and cartilage and the joints are grouped according to their motion:

• A ball and socket joint.
• A hinge joint.
• A condyloid joint (a joint that permits all forms of angular movement except axial rotation).
• A pivot joint.
• A gliding joint.
• A saddle joint

Joints can move in four and only four ways:

• Gliding, one bony surface that glides on another without angular or rotatory movement.
• Angular, occurs only between long bones, increasing or decreasing the angle between the bones.
• Circumduction, occurs in joints composed of the head of a bone and an articular cavity, the long bone describing a series of circles, the whole forming a cone.
• Rotation, a bone that moves around a central axis without moving from this axis.