Which joint type is primarily involved in rotational movement?

The pivot joint is specifically designed for performing rotational movements. This type of joint has a unique structure where one bone rotates around another, allowing for a high degree of rotation around a singular axis. A prime example of a pivot joint is the atlantoaxial joint in the neck, which allows for the rotation of the head from side to side.

In contrast, hinge joints, like the knee or elbow, primarily allow for flexion and extension, enabling movements along one plane rather than rotation. Ball-and-socket joints, such as the shoulder and hip, do permit rotation but also allow for a wider range of movements including flexion, extension, abduction, adduction, and circumduction. Saddle joints, found in the thumb, allow for stable movements in two planes but do not support significant rotational motion. Thus, when considering which joint type is primarily involved in rotational movement, the pivot joint stands out as the most specialized for such an action.