What type of mobility does amphiarthrosis allow?

Amphiarthrosis refers to a type of joint that permits only limited movement. This classification of joints allows for slight multidirectional mobility, which means they can bend or twist slightly, but they do not offer the extensive range of motion found in other types of joints, like diarthroses.

Specifically, amphiarthrodial joints, such as the pubic symphysis or the intervertebral discs, provide stability while also allowing a minimal degree of movement. This slight mobility is important for functions like shock absorption and flexibility in the spine, making it crucial for activities that require a balance between stability and movement.

In the context of the other answer choices, fixed joints do not allow for any movement at all, while joints that offer a full range of motion or only unidirectional movement do not appropriately describe the unique characteristics of amphiarthroses. Therefore, the correct answer reflects the specific function and flexibility that typifies this category of joints.