What covers the epiphysis where the joints occur?

The area that covers the epiphysis of bones where joints occur is known as articular cartilage. This smooth, slippery tissue provides a protective layer that facilitates movement at the joints by reducing friction between the articulating surfaces of bones. Articular cartilage is crucial for ensuring the bones glide smoothly against each other during joint movements, which is essential for both mobility and function.

Trochanters, epicondyles, and spines are terms that refer to specific bony protrusions or landmarks on a bone and do not serve the role of covering joints. Trochanters are large, bony prominences where muscles and tendons attach, epicondyles are found near the elbow and serve as attachment points for ligaments and tendons, and spines are pointed processes that also provide attachment for muscles. None of these structures provide the necessary cushioning or smooth surface required for joint articulation, highlighting the unique and essential role of articular cartilage in joint function.