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Objective·To explore the role of advanced platelet-rich fibrin (A-PRF) in osteochondral regeneration.Methods·Bone-marrow mesenchymal stem cells (BMSCs) and knee joint chondrocytes were obtained from New Zealand rabbits. A-PRF was obtained by low-speed centrifugation of the heart blood of rabbits. The histological structure of A-PRF was observed by an optical microscope. The release of growth factors in A-PRF was detected by ELISA, including platelet-derived growth factor, transforming growth factor-β, insulin-like growth factor, vascular endothelial growth factor, epidermal growth factor and fibroblast growth factor. A-PRF's cytotoxicity and capability for promoting the proliferation of rabbit BMSCs were detected by live/dead double staining and MTT methods. The effect of A-PRF on the gene expression of type Ⅱ collagen, aggrecan, alkaline phosphatase (ALP) and osteocalcin (OCN) in rabbit BMSCs was detected by real-time fluorescence quantitative polymerase chain reaction (qRT-PCR). Transwell chambers were used to determine the effect of A-PRF on the migration ability of rabbit BMSCs and the chondrocytes. Rabbit knee osteochondral defect models were established, and 18 rabbits were randomly divided into 3 groups. The A-PRF group (n=6) was implanted with A-PRF in the defect, the A-PRF+BMSCs group (n=6) was implanted with rabbit BMSCs on A-PRF, and the control group (n=6) did not undergo implantation. The rabbits were sacrificed 12 weeks after surgery and the knee joint specimens were stained with hematoxylin-eosin (H-E), toluidine blue and safranin O/fast green. Based on the surface morphology and histology of the knee joints, the International Cartilage Repair Society (ICRS) scoring system was used for macroscopic and histological scoring.Results·A-PRF had a loose network structure and can slowly release growth factors. No cytotoxicity to rabbit BMSCs was observed after adding A-PRF, and the the capability for promoting the proliferation of rabbit BMSCs was significantly increased at 24, 48 and 72 h after adding A-PRF (all P

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