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Chondral defect

A chondral defect is a crater in the gristle or hyaline cartilage at the end of the bones. 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.