Response to: “T1 Slope in the Cervical Spine Magnetic Resonance Imaging: A Novel Concept”

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Asian Spine J. 2018;12(1):194-194
Publication date (electronic) : 2018 February 07
doi :
Department of Orthopaedic Surgery, Gwangmyeong Sungae Hospital, Gwangmyeong, Korea.
Corresponding author: Seung-Hwan Lee. Department of Orthopaedic Surgery, Gwangmyeong Sungae Hospital, 36 Digital-ro, Gwangmyeong, 14241 Korea. TEL: +82-2-2680-7699, FAX: +82-2-2680-7755,
Received 2018 January 05.


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].


Conflict of Interest: No potential conflict of interest relevant to this article was reported.


1. Knott PT, Mardjetko SM, Techy F. The use of the T1 sagittal angle in predicting overall sagittal balance of the spine. Spine J 2010;10:994–998. 20970739.
2. Miyazaki M, Hong SW, Yoon SH, et al. Reliability of a magnetic resonance imaging-based grading system for cervical intervertebral disc degeneration. J Spinal Disord Tech 2008;21:288–292. 18525490.
3. Yang BS, Lee SK, Song KS, et al. The Use of T1 Sagittal Angle in Predicting Cervical Disc Degeneration. Asian Spine J 2015;9:757–761. 26435795.

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