Uniaxial joints have only one axis of
rotation and operate much like hinges. The elbow joint and the joints
connecting the phalanges of the fingers are examples of uniaxial joints.
Biaxial joints, such as the wrist and
the ankle, allow movement in two perpendicular axes.
Multiaxial joints have at least three
axes of motion and can create movement in all three perpendicular
planes. The shoulder and hip, which are ball-and-socket joints, are
examples of multiaxial joints.