Comment:1. T1 slope was measured as the angle between a horizon tal line and superior endplate of T1 in standing lateral radiograph of cervical spine[1].2. Cervical lordosis was measured between lower end plate of C2 and inferior end plate of C7 in the same standing lateral radiograph[2].3. Cervical intervertebral disc degeneration was measured in T2-weighted sagittal images based on the magnetic resonance imaging-based grading system.4. T1 slope could not be measured in MRI because the subject was in lying position.5. In our study, patients with low T1 slope(≤25°) in standing lateral radiograph had higher grade of degeneration in cervical MRI than patients with high T1 slope(>25) in C5–6 and C6–7 intervertebral discs[3].