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The graph illustrating total inter-vertebral height (TIH) of non-subsidence group and subsidence group at each follow-up. Until the 8 week follow-up, there was no statistically significant difference in TIH between non-subsidence group and subsidence group. Statistically significant difference is observed at the last follow-up(p=0.0497), indicating that the subsidence has occurred at later than 8 weeks after surgery.
