Hinge joints are uniaxial, whereas ball and socket joints are multiaxial.
Specific types of synovial joints (Fig. 1.20)
Plane joints—allow sliding or gliding movements when one bone moves across the surface of another (e.g., acromioclavicular joint)
Hinge joints—allow movement around one axis that passes transversely through the joint; permit flexion and extension (e.g., elbow [humero-ulnar] joint)