Which joint type allows the greatest range of motion?

• A. Hinge joint
• B. Pivot joint
• C. Ball and socket joint
• D. Saddle joint

Answer: (C)

Movement range in joints depends on how the bones fit together. Ball-and-socket joints have a spherical head fitting into a cup-shaped socket, which permits movement in many directions: flexion-extension, abduction-adduction, rotation, and circumduction. This multi-axial ability means they provide the widest overall range of motion among common joint types. In comparison, hinge joints move mainly in one plane (like bending and straightening), pivot joints rotate around a single axis, and saddle joints offer two planes but not the full three-dimensional movement. So the ball-and-socket design allows the greatest range of motion.