Which joint type allows the widest range of motion and is found in the shoulder and hip?

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

Answer: (A)

Ball-and-socket joints allow the widest range of motion. The ball-shaped end of one bone sits in a cup-shaped socket of another bone, enabling movement in many directions—forward and backward, side to side, rotation, and circumduction. In the shoulder, the glenohumeral joint has a relatively shallow socket, which increases mobility (though with less inherent stability). In the hip, the socket is deeper, providing more stability while still allowing substantial movement due to the ball-and-socket arrangement.

Hinge joints move mainly in one plane (like bending and straightening), pivot joints allow rotation around a single axis, and saddle joints offer movement in two planes but not the full multi-directional freedom of a ball-and-socket joint.