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Why does articular cartilage help joints move smoothly?

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Front and back views of the human skeleton are shown side by side, with labeled bones including the skull, spine, ribs, pelvis, arms, legs, hands, and feet. Insets detail the bones of the foot and hand, highlighting major bone groups and anatomical terms. — human skeleton Front and back views of the human skeleton.

Articular cartilage facilitates smooth joint movement primarily through its physical properties and its role in managing joint congruence. As a type of hyaline cartilage, it is both deformable and elastic, allowing it to recover its shape quickly after stress is removed.1

This deformability is crucial because, in most positions, the articulating surfaces of a joint fit together imperfectly. The cartilage can undergo mutual deformation, which helps lessen this incongruence and allows for smoother motion between the bones. Furthermore, the surface of articular cartilage is smooth, which minimizes resistance during movement. While the cartilage itself provides these mechanical benefits, it also relies on the presence of synovial fluid for lubrication, which is essential for the seamless interaction of the "mating" bone surfaces within a joint.12