A pivot joint is characterized by its unique ability to allow rotational movement around a single axis. This type of joint consists of a cylindrical bony structure that rotates within a ring formed by another bone and surrounding ligament. An excellent example of a pivot joint in the human body is the atlantoaxial joint, which allows for the rotation of the head in relation to the spine, enabling movements like shaking the head 'no.'
In contrast, ball and socket joints permit a wider range of motion, including rotational movements, but they allow for multiple axes of movement, providing more versatility than just rotation. Hinge joints, such as the elbow, primarily enable bending and straightening motions but do not support rotation. Fixed joints, like those found in the skull, do not allow any movement, including rotation. Thus, the pivot joint's distinct design makes it the most suitable choice for defining rotational movement specifically.