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Cervical lordosis in fusion versus arthroplasty group (a), and group without ASD versus group with ASD (b). There were no significant differences between groups. About intergroup comparisons between postoperative 5 years with preoperative state, cervical lordosis was significantly increased at all group except the fusion group (a, b) (†Wilcoxon signed-ranks test and p < 0.01, ‡p < 0.05)
