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C7PL was defined distance between C7 plumb line which is the vertical line originating the center of the C7 vertebral body and the posterior superior corner of S1, and its length was measured preoperatively and at ÿnal follow-up. The distance between the center of the UIV and C7PL was also measured early postoperatively and at final follow-up. C7PL: C7 plumb line, UIV: uppermost instrumented vertebra.
