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Histopathological study. (a) control group, (b) Saline group, (c) MIA+/MSC− group, (d) MIA+/MSC+ group. Control group and Saline group: Cartilage tissue is intact. MIA+/MSC− group: Although the cartilage tissue is preserved on the whole, the cartilage tissue surface layer shows partial injury. MIA+/MSC+ group: Although not as clearly as C, the cartilage tissue surface layer shows partial injury.
