Which of the following is not a characteristic of saddle joints?

Saddle joints are unique in their structure and function, characterized by having two concave surfaces that articulate with two convex surfaces. This configuration allows for a significant range of motion, including multi-axial movement, which enables flexion, extension, abduction, and adduction.

Saddle joints are commonly known for their presence in the thumb, where the metacarpal of the thumb meets the trapezium bone in the wrist, facilitating a wide range of movements necessary for grasping and manipulation. The ability to move in multiple planes is a hallmark feature of these joints.

While saddle joints do allow for sliding movements to some extent, their primary characteristic is their versatility in allowing different types of movements rather than merely sliding. Importantly, saddle joints are limited in rotational movement. This restriction is due to their anatomical configuration, which is designed to promote stability and specialized function rather than the free range of movement found in ball-and-socket joints.

Thus, the statement about permitting sliding movement does not accurately reflect the primary function or characteristic of saddle joints, which is much more focused on multi-axial movement capabilities while also restricting rotational abilities. This nuanced understanding of saddle joints highlights their balance between movement and stability, distinguishing them from other joint types.