Intervention; interposition; the act of a third person who interferes between two contending parties with a view to reconcile them or persuade them to adjust or settle their dispute.
Subchondral cyst formation is characteristic of osteoarthritis and can be routinely found on x-rays. A subchondral cyst is a fluid-filled sac that extrudes from the joint, consisting of thickened joint material (mostly hyaluronic acid, a substance found in the normal joint fluid that serves to lubricate the joint). Subchondral bone is the layer of bone just below the cartilage.
A ganglion cyst is a round, fluid-filled lump of tissue that usually appears along tendons or joints. It typically occurs on the wrist or hand, but it can also appear on the ankle or foot. Ganglion cysts can be as large as an inch across.