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.
Fifty-three-year-old male with subchondral cyst development. Baseline MRI: T2-weighted coronal (A) and sagittal (B) images show a subchondral region of bone marrow edema-like signal in the central portion of the lateral femoral condyle (arrows).