الفهرس 
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Abstract
Chondral lesions are common and affect a large sector of young population. If articular cartilage inuries not be managed properly it will lead to chondropenia and finally to osteoarthritis.
Chondral lesions may occur due to traumatic or degenerative cause chondral lesins mostly occur in assiociation with meniscal injuries.
International cartilage repair society (ICRS) divide chondral lesions according to depth of the lesion into 4 grades. Grade 3and 4 are the most common types.
Any associated injuries like meniscal injuries are critical components of functional unit of articular cartilage, they also increase the load on the chondral surface and may worsen the existing defects and prevent successful repair.
In the diagnosis of chondral lesions plain radiographs should be used to rule out fractures, evaluate for degenerative changes and assess alignment.
MRI has an important role in the diagnosis of any associated injury as meniscal or ligamentous injury and has role in diagnosis of chondral lesion itself.
There is no chance for articular cartilage to regenerate normal hyaline cartilage because it is avascular, alymphatic, aneural, and because of high matrix to cell ratio.
Violation of the subchondral bone will lead to healing by fibrocartilage which is biologically and biomechanically inferior.