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Table 1 Demographics

From: Retrospective analysis of surgical outcomes for atlantoaxial subluxation

Case, no. 30
RA, no. 7
OA, no. 20
Trauma, no. 3
Age, average, years 70.3 ± 8.7
Sex, female/male, no. 11/19
Ranawat value, average, mm
 Preoperative 14.0 ± 3.3
 Postoperative 13.6 ± 2.7
CAA, average, degrees
 Preoperative 155.6 ± 7.4
 Postoperative 158.4 ± 6.7
C1/2 angle, average, degrees
 Preoperative 19.9 ± 10.0
 Postoperative 22.1 ± 9.4
ADI flexion/extension, average, mm
 Preoperative 8.1 ± 2.7/4.4 ± 2.4
 Postoperative 5.5 ± 3.2/4.4 ± 2.6
ADI neutral, average, mm
 Preoperative 7.1 ± 2.8
 Postoperative 4.7 ± 2.8*
C2–7 angles, average, degrees
 Preoperative 9.6 ± 13.6
 Postoperative 3.5 ± 13.4
Cervical SVA, average, mm
 Preoperative 22.2 ± 19.6
 Postoperative 26.0 ± 20.7
Operative time, average, min 163.5 ± 64.9
Blood loss, average, mL 136.5 ± 304.0
C-JOA score, average, points
 Preoperative 9.4 ± 3.9
 Postoperative 12.4 ± 3.6*
Recovery rate of C-JOA score, average, % 46.0 ± 35.3
Complications, no. 9 (30.0%)
Revision, no. 6 (20.0%)
  1. RA indicates rheumatoid arthritis, OA osteoarthritis, CAA clivoaxial angle, ADI atlantodental interval, SVA sagittal vertical axis, C-JOA Japanese Orthopedic Association for Cervical myelopathy
  2. *p < 0.05 when compared to the preoperative status