Why do authors consider syndesmosis an example of amphiarthrosis?

Authors consider syndesmosis an example of amphiarthrosis because it represents a type of fibrous joint where bones are connected by ligaments, allowing for slight movement. This characteristic aligns with the definition of amphiarthrosis, which permits limited mobility compared to synarthrosis (immovable joints) and diarthrosis (freely movable joints). In syndesmosis, such as between the tibia and fibula, the flexible connection enables some degree of movement while still providing stability.