Ball and socket joint

A ball and socket joint (enarthrosis, spheroidal joint) is a joint in which the ball-shaped surface of a bone fits into the cup-like indentation of another bone. This type of joint allows the bone to move in a 360° angle—with more freedom than other joints.^[1]

Ball and socket joint
1: Ball and socket joint; 2: Condyloid joint (Ellipsoid); 3: Saddle joint; 4 Hinge joint; 5: Pivot joint;
Capsule of shoulder-joint (distended). Anterior aspect.
Identifiers
TA	A03.0.00.050
FMA	75301
Anatomical terminology [edit on Wikidata]

Examples

Examples of this type of joint occur:

• in the hip, where the rounded head of the femur (ball) rests in the cup-like acetabulum (socket) of the pelvis.
• in the glenohumeral joint of the shoulder, where the rounded head of the humerus (ball) rests in the cup-like glenoid fossa (socket) of the shoulder blade.^[2]

Other images

• 
  Hip
• 
  Shoulder