Relationship between TIA minus C0-7 angle and C2-7 SVA: analysis of 113 symptomatic patients

• Published in: BMC musculoskeletal disorders Vol. 23; no. 1; pp. 338 - 9
• Main Authors: Yang, Kai, Li, Xiang-Yu, Wang, Yu, Kong, Chao, Lu, Shi-Bao
• Format: Journal Article
• Language: English
• Published: England BioMed Central Ltd 08.04.2022; BioMed Central; BMC
• Subjects: Arthritis; C0-7 angle; C2-7 SVA; Cervical sagittal alignment; Diagnosis; Diagnosis, Radioscopic; Health surveys; Magnetic resonance imaging; Medical examination; Methods; Morphology; Multiple regression analysis; Musculoskeletal diseases; Neck pain; Patients; Regression analysis; Spinal osteophytosis; Surgery; Thoracic inlet angle; Thorax; Vertebrae, Cervical; China; C2-7 SVA; Cervical sagittal alignment; C0-7 angle; Thoracic inlet angle
• ISSN: 1471-2474; 1471-2474
• DOI: 10.1186/s12891-022-05301-0

Measurement of T1 slope (T1S) can be difficult due to the anatomical positioning of the shoulders. And thoracic inlet angle (TIA) was a morphological parameter and not changed by the position. We proposed a new parameter, TIA minus C0-7 angle (TIA-C07), to evaluate C2-7 SVA in order to overcome the T1S imperfection. This was a retrospective radiological analysis of symptomatic subjects. The following cervical parameters were measured: Cervical lordosis angle (CL), C0-7 angle (C0-7), occiput-C2 lordosis angle (O-C2), C2-7 sagittal vertical axis (C2-7 SVA), TIA and TIA-C07. The Pearson correlation test was calculated, and the stepwise multiple regression analysis was conducted to determine the best predictor for C2-7 SVA. A paired sample t test was used to compare the predicted and measured C2-7 SVA. The mean age of 113 patients was 60.02 ± 9.67. The average O-C2, CL, C0-7, TIA, TIA-C07 and C2-C7 SVA was 29.24 ± 8.48°, 13.67 ± 11.22°, 42.91 ± 11.44°, 76.07 ± 9.54°, 33.16 ± 13.18° and 21.34 ± 11.42 mm. The predictive formula was founded: C2-7 SVA = 2.80 + 0.56 * (TIA-C07) (R = 0.645, R2 = 0.416). There was no statistical difference between the predicted and the measured C2-7 SVA (t = 0.085, P = 0.933). TIA and C0-7 mismatch may significantly impact cervical alignment, and a greater T1A-C07 was related to a greater degree of C2-7 SVA. TIA-C07 may be a more important predictor for C2-7 SVA.