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Location of COR at preoperative, M12 and M24 assessments for patients with C5–C6 TDR (n = 24/32). Patients COR were compared with COR obtained from a control group of normal and asymptomatic subjects for operated level (C5–C6), upper adjacent level (C4–C5) and lower adjacent level (C6–C7). The dispersion of CORs around the mean position is greater for instrumented levels than for control levels
