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Lateral radiograph: (A) T1 slope and C2–C7 angle. (B) FSU angle: angle between c and d; UAS angle: angle between b and c; LAS angle: angle between d and e. (C) Preoperative ROM. (D) Postoperative ROM. FSU – functional spinal unit; UAS – upper adjacent segment; LAS – lower adjacent segment; ROM – range of motion.
