Predictive formula of cervical lordosis in asymptomatic young population

• Published in: Journal of orthopaedic surgery and research Vol. 15; no. 1; pp. 2 - 6
• Main Authors: Zhu, Yuchen, An, Zhongcheng, Zhang, Yingjian, Wei, Hao, Dong, Liqiang
• Format: Journal Article
• Language: English
• Published: England BioMed Central Ltd 03.01.2020; BioMed Central; BMC
• Subjects: Adult; Asymptomatic Diseases - epidemiology; Cervical lordosis; Cervical sagittal alignment; Cervical Vertebrae - diagnostic imaging; Clinical outcomes; Female; Humans; Lordosis; Lordosis - diagnostic imaging; Lordosis - epidemiology; Male; Morphology; Multiple regression analysis; Orthopedics; Pelvis; Physiological aspects; Physiology; Population studies; Posture; Predictive formula; Predictive Value of Tests; Prospective Studies; Regression analysis; Spine (cervical); Standard deviation; Surgery; Thoracic inlet angle; Thorax; Young Adult; Cervical sagittal alignment; Regression analysis; Thoracic inlet angle; Cervical lordosis; Predictive formula
• ISSN: 1749-799X; 1749-799X
• DOI: 10.1186/s13018-019-1526-x

Not a large number of previous studies have reported the normal sagittal balance of the cervical spine and physiological cervical lordosis (CL) has not been clearly defined yet. This was a prospective radiological analysis of asymptomatic subjects. The following cervical sagittal parameters were measured: CL, thoracic inlet angle (TIA), T1 slope (T1S), neck tilt (NT), and C2-7 sagittal vertical axis (C2-7 SVA). The Pearson correlation test was calculated, and the stepwise multiple regression analysis was conducted by using the CL (dependent variable) and the other cervical sagittal parameters (independent variables) to determine the best sets of predictors. A paired sample t test was conducted between the predicted and measured values. The mean age of 307 participants was 24.54 + 3.07. The mean CL, TIA, T1S, NT, and C2-C7 SVA was 17.11° ± 6.31°, 67.87° ± 7.78°, 25.84° ± 5.36°, 42.53° ± 6.68°, and 14.60 ± 8.20 mm, respectively. The formula was established as follows: CL = 0.762 × T1S - 0.392 × C2-C7 SVA + 0.25 × TIA - 13.795 (R = 0.812, R  = 0.660) (stepwise multiple regression) and CL = 0.417 × TIA - 11.193 (R = 0.514, R  = 0.264) (simple linear regression). There was no statistical difference between the predicted CL and the measured CL (t = 0.034, P = 0.973). There was a significant correlation between CL and other cervical sagittal parameters, including TIA, T1S, NT, and C2-C7 SVA in asymptomatic Chinese population. The results of this study may serve as a normal reference value for the study of asymptomatic population.