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A Macroscopic appearance. B Gross Score showed a marked increase in cartilage damage in the BM-only and None-SFBM groups at 4, 8, and 12 weeks after the operation. Medians ± Interquartile range (M ± QR) star P < 0.005, vs. SFBM-both group; triangle P < 0.005, vs. SF-only group
