Which type of joint allows for rotational movement?

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

Answer: (B)

The most suitable joint that allows for rotational movement is the ball and socket joint. This type of joint features a spherical head of one bone fitting into a cup-like socket of another, enabling a wide range of motion, including rotational movements. In the case of the shoulder and hip joints, these structures allow the bones to rotate around multiple axes, providing flexibility and a broader range of movements compared to other joint types.

While the pivot joint also allows for rotational movement, it is more limited in scope. It enables rotation around a single axis, as seen in the neck (the atlantoaxial joint allows you to turn your head from side to side). However, the ball and socket joint provides more extensive rotational capabilities.

On the other hand, hinge joints are designed for flexion and extension movements, similar to how a door opens and closes, without allowing for rotation. Gliding joints allow for sliding or gliding movements but do not support rotational motion. Thus, the ball and socket joint is the correct answer, as it offers the most versatility for rotational movements.