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 ...

Severe pain from arthritis in your middle knuckle (PIP joint) may require replacement (arthroplasty). Silicone replacements are the most common. They tend to have the best results and typically last ...

Mucous cysts are pseudocysts (cystic structures lacking a true lining) that usually appear on the middle or index finger of the dominant hand; toe involvement is uncommon. Although most mucous cysts ...