"Chondral fissures are a type of chondral injury, more accurately cracks, cleavages or crevices of cartilage extending from the articular surface to the deeper chondral layers. They usually develop as a result of high compressive forces 1 and are often found in the patellar or trochlear cartilage."
"On MRI they show up as thin fluid-intense, chondral clefts and are best visible on T2 weighted, STIR or intermediate weighted images 1-3."