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C2-7 ROM in fusion versus arthroplasty group (a), and group without ASD versus group with ASD (b). There was a significant difference between groups without ASD and with ASD at postoperatively 5 years (*Mann–Whitney test, Spearman rs = −0.334, p < 0.01). About intergroup comparison between postoperative 5 years with preoperative state, there were no significant differences
