Basically how each joint is anchored to the other.

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The main idea being tested is how each joint is anchored to the adjacent bones, which is described by the structural classification of joints. This classification looks at the tissue binding the bones and whether a joint cavity is present, dividing joints into fibrous (binds bones with dense connective tissue), cartilaginous (bound by cartilage), and synovial (has a fluid-filled joint cavity). This is the best choice because it directly addresses the anatomy of how bones are connected at a joint, not how they move or what forces act on them. Functional classification focuses on how much movement the joint allows, not the binding tissue, while inertia and kinetics relate to motion and forces rather than the anatomical binding of bones. For example, sutures are fibrous joints, intervertebral joints are cartilaginous, and the knee is a synovial joint, illustrating how the binding tissue and presence of a joint cavity define the joints’ connections.