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Grade of epidural scar adhesion according to the Rydell standard.
P<0.05, the control group compared with MMC-PLA group.
P<0.05, the control group compared with MMC-PEG group. There was no significant difference between the experimental groups. MMC-PLA, mitomycin C-polylactic acid; MMC-PEG, mitomycin C-polyethylene glycol.
