What Is a Subchondral Bone Cyst? It's a fluid-filled sac that forms in one or both of the bones that make up a joint. They're especially common at the knee or hip. The cysts show up just under the ...

Subchondral sclerosis is the hardening of bone tissue beneath cartilage, often detected in later stages of osteoarthritis, but its exact cause and relationship to osteoarthritis are still under ...