Which joint type allows for rotational movement?

The pivot joint is specifically designed to allow for rotational movement. This type of joint consists of a cylindrical bone that rotates within a ring formed by another bone and connective tissue. One prominent example of a pivot joint is found in the neck, where the first and second cervical vertebrae (the atlas and axis) allow for the head to rotate from side to side, enabling actions such as shaking one's head.

In contrast, the other joint types mentioned do not primarily facilitate rotational motion. The saddle joint allows for flexion, extension, and some degree of rotation, but not to the extent of a pivot joint. The hinge joint permits movement primarily in one plane, allowing for flexion and extension, like the bending of the elbow or knee. The ball-and-socket joint does enable a wide range of movements, including rotation, but its primary characteristics involve multi-axial movement encompassing various directions rather than the singular rotational motion that defines the pivot joint.