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Table 2 Comparison between the cases treated by C1 laminectomy and the cases treated by the C1/2 fixation

From: Retrospective analysis of surgical outcomes for atlantoaxial subluxation

Surgery type C1 laminectomy C1/2 fixation
Case, no. 11 19
RA, no. 1 (9.1%) 6 (31.6%)
OA, no. 8 (72.7%) 12 (63.2%)
Trauma, no. 2 (18.2%) 1 (5.3%)
Age, average, years 74.6 ± 6.8 68.0 ± 9.0
Sex, female/male, no. 2/9 9/10
Operative time, average, min 123.5 ± 54.9 186.6 ± 59.8
Blood loss, average, mL 53.2 ± 69.2 184.7 ± 373.6
Ranawat value, average, mm
 Preoperative 13.8 ± 3.2 14.2 ± 3.5
 Postoperative 13.1 ± 2.9 13.9 ± 2.6
CAA, average, degrees
 Preoperative 154.3 ± 7.5 156.4 ± 7.4
 Postoperative 155.3 ± 5.9 160.3 ± 6.5
C1/2 angle, average, degrees
 Preoperative 24.1 ± 10.8 17.5 ± 8.9
 Postoperative 25.4 ± 10.5 20.2 ± 8.3
ADI flexion/extension, average, mm
 Preoperative 7.2 ± 2.4/5.0 ± 2.4 8.6 ± 2.8/4.0 ± 2.4
 Postoperative 8.2 ± 2.9/5.4 ± 2.9 3.9 ± 2.2/3.9 ± 2.2
ADI neutral, average, mm
 Preoperative 6.1 ± 2.5 7.6 ± 2.9
 Postoperative 6.1 ± 3.2 3.9 ± 2.2*♰
C2–7 angles, average, degrees
 Preoperative 10.5 ± 13.0 9.1 ± 14.2
 Postoperative 2.8 ± 13.9 3.8 ± 13.4
Cervical SVA, average, mm
 Preoperative 40.6 ± 13.8 12.3 ± 14.4
 Postoperative 41.9 ± 20.7 17.5 ± 15.4
C-JOA score, average, points
 Preoperative 8.5 ± 4.1 9.8 ± 3.8
 Postoperative 11.1 ± 4.2 13.1 ± 3.1*
Recovery rate of C-JOA score, average, % 39.4 ± 30.5 49.8 ± 38.0
Complications, no. Hematoma = 1 AAF = 1 (18.2%) Septic emboli = 1 SSI = 2 DSI = 1 VS = 1 AAF = 2 (36.8%)
Revision, no. 2 (18.2%) 4 (21.1%)
  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, SSI surgical site infection, DSI donor site infection, VS vertical subluxation, AAF Anterior arch fracture
  2. *p < 0.05 when compared to the preoperative status
  3. p < 0.05 when compared to the C1 laminectomy group