Subchondral Cyst

Question 1

Describe the synovial fluid intrusion theory

Answer 1

Proposes that articular surface defects and increase intra-articular pressure allow intrusion of synovial fluid into the bone, leading formation of cavities

Question 2

Describe the bone contusion theory

Answer 2

Non-communicating cysts arise from subchondral foci of bone necrosis that are the result of opposing articular surface coming in contact with each other