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Disc height index assessment. In group D, disc height index (DHI) decreased to 63% 4 weeks after injury induction, and showed further DHI deterioration to 58% at week 12. In contrast, DHI in group S could be maintained at 72% after 4 weeks, and was significantly higher in group S compared to group D at 4, 8, and 12 weeks. Abbreviations: D: AF defect only group, S: AF defect treated with sheet transplantation group, C: sham group * P <.05, ** P <.01 comparing group S to group D (n = 9)
