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KMID : 0388720180250020054
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Journal of Korean Society of Spine Surgery
2018 Volume.25 No. 2 p.54 ~ p.59
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The Effect of Cervical Lordosis on Cervical Disc Degeneration in Patients with a High T1 Slope
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Hong Sung-Ha
Lee Seung-Hwan
Park Byeong-Mun
Song Kyung-Sub
Lim Sung-Tae
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Abstract
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Study Design: Retrospective evaluation.
Objectives: To analyze the effect of cervical lordosis on cervical disc degeneration in patients with a high T1 slope.
Summary of Literature Review: The T1 slope is known to be a parameter that may be very useful in evaluating sagittal balance. We previously reported that a low T1 slope was a potential risk factor for cervical spondylosis, especially in the C6?7 cervical segment. However, no study has analyzed the effect of cervical lordosis in patients with a high T1 slope (>25) on cervical disc degeneration.
Materials and Methods: Seventy-seven patients with a high T1 slope who underwent cervical spine MRI in our orthopedic clinic were enrolled. Patients were divided into 2 groups according to cervical compensation. The radiologic parameters obtained from radiography and cervical spine MRI were compared between the uncompensated group (cervical lordosis <25) and the compensated group (cervical lordosis ≥25).
Results: In the uncompensated group, the average degeneration grade of each segment was 2.72 (±0.70) in C2?3, 3.00 (±0.76) in C3?4, 3.02 (±0.91) in C4?5, 3.37 (±0.95) in C5?6, and 2.95 (±0.98) in C6?7. The average degeneration grade of each segment in the compensated group was 2.38 (±0.78) in C2?3, 2.38 (±0.60) in C3?4, 2.62 (±0.60) in C4?5, 2.82 (±0.72) in C5?6, and 2.41 (±0.74) in C6?7. The degeneration grade was significantly higher in the uncompensated group than in the compensated group for all cervical segments. The risk of high-grade degeneration of C3?4 was significantly higher in the uncompensated group (odds ratio = 6.268; 95% CI, 2.232?17.601; p<.001).
Conclusions: Patients with a high T1 slope without compensation of cervical lordosis had a higher grade of degeneration in all cervical segments.
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KEYWORD
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Cervical disc degeneration, T1 slope, Cervical lordosis
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