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Osteochondral structure and ICRS classification system of osteochondral defects [45,48]. (A) Schematic and arthroscopic view of ICRS classification system addressing osteochondral defects. (B) Extracellular layered structure of osteochondral units and main components in cartilage matrix. Reproduced with permission [45,48]. Copyright 2020, John Wiley & Sons Inc.; Copyright 2021, KeAi Communications Co. Ltd.
