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Cage subsidence (CS) course of a 63 years old man. Disk height (DH) was measured as the vertical distance between the midpoint of the cranial endplate and the caudal endplate on the CT midsagittal plane (a). CS was identified at 1 month post- (c), and obviously progressed at 3 months post- (d), while did not significantly change at 6 (e) and 12 (f) months post-. Pre-, preoperative; post-, postoperative
