The term is usually reserved for a focal or isolated crater caused by an injury, where the joint surface and a bit of underlying bone has been knocked off.
Common injuries causing chondral defects are those injuries where there is a direct blow to the bent knee - dashboard injury in a car accident. falling down onto a hard surface roller-skating etcetera.
A player lands with force onto his knee.The chondral defect is the crater. The loose body is the bit that breaks off.
There is currently no content classified with this term.