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Table 1 Characteristics of the study patients

From: Relationship between the atlantodental interval and T1 slope after atlantoaxial fusion in patients with rheumatoid arthritis

Characteristics Preoperative Postoperative (1 month) Postoperative (12 months) p-value
Overall, n 64  
Female sex, n (%) 58 (90.6)  
Age, mean ± SD, year 50.9 ± 14.4  
Surgical type, n (%)   
 TAF 33 (51.6)  
 C1LM-C2P screw fixation 31 (48.4)  
Surgical side, n (%)   
 Right 14 (21.9)  
 Left 19 (29.7)  
 Both 31 (48.4)  
BMI, mean ± SD, kg/m2 22.2 ± 2.8  
Preoperative myelopathy, n (%) 10 (15.6)  
DAS28, mean ± SD 3.6 ± 0.8  
ADI, mean ± SD, mm 8.0 ± 1.8 2.4 ± 0.7 2.3 ± 0.5  < 0.001
ADI, median (IQR), mm 8.15 (7.06–9.12) 2.42 (1.95–3.00) 2.42 (1.90–2.78)  < 0.001
Oc-C2 angle, mean ± SD 26.5 ± 9.5 29.4 ± 7.1 30.8 ± 7.1 0.010
C2-C7 angle, mean ± SD 13.3 ± 8.1 11.0 ± 5.5 12.7 ± 6.7 0.157
T1 slope, mean ± SD 18.8 ± 7.2 17.1 ± 6.4 18.3 ± 6.9 0.368
cSVA (C2-C7), mean ± SD, mm 15.5 ± 8.9 13.2 ± 7.2 12.6 ± 7.5 0.087
VAS score, median (IQR) 8 (8–9) 3 (2–3) 2 (1–2)  < 0.001
  1. SD, standard deviation; TAF, transarticular screw fixation; C1LM-C2P, C1 lateral mass and C2 pedicle; BMI, body mass index; DAS28, disease activity score of 28 joints; ADI, atlantodental interval; IQR, interquartile range; cSVA, cervical sagittal vertical axis; VAS, visual analog scale