FIGURE 4. Lateral preoperative cervical spine radiography (B) shows C2–7 CL (yellow) of 7.7°, a C2–3 angle (skyblue) of 1.5°, and a C2–7 SVA (red) of 51.63 mm. Postoperative radiography (A) shows CL of 6.4°, a C2–3 angle of 3.5°, and a C2–7 SVA of 30.1 mm. There is no significant change in CL or C2–3 angle, but C2–7 SVA has improved, indicating the improvement of sagittal imbalance.

CL: cervical lordosis, SVA: sagittal vertical axis.