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Preoperative and postoperative radiographic evaluation. The mean C2-7 lordotic angle of the neutral position changed from 8.8° ± 11.0° to 5.6° ± 12.0° at the final follow-up. The mean percentage of slip improved significantly immediately after surgery (p = 0.0017) and at the final follow-up (p = 0.0017). a)p < 0.05.
