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Table 3 Comparison between the cases with poor clinical outcomes and the cases with good outcomes

From: Retrospective analysis of surgical outcomes for atlantoaxial subluxation

  C1 laminectomy C1/2 fixation
Clinical outcome Poor Good Poor Good
Case, no. 6 5 7 12
RA, no. 1 (16.7%) 0 (0%) 3 (42.9%) 3 (25.0%)
OA, no. 4 (66.7%) 4 (80.0%) 4 (57.1%) 8 (66.7%)
Trauma, no. 1 (16.7%) 1 (20.0%) 0 (0%) 1 (8.3%)
Age, average, years 74.2 ± 7.9 74.8 ± 6.2 69.1 ± 10.5 67.3 ± 8.3
Sex, female/male, no. 1/5 1/4 3/4 6/6
Operative time, average, min 121.3 ± 62.7 126.2 ± 51.0 159.6 ± 47.4 202.4 ± 62.3
Blood loss, average, mL 61.0 ± 89.0 43.8 ± 43.1 149.4 ± 244.0 205.3 ± 441.1
Ranawat value, average, mm
 Preoperative 13.7 ± 3.0 13.8 ± 3.7 14.6 ± 4.6 14.0 ± 2.3
 Postoperative 12.9 ± 3.2 13.3 ± 2.9 14.2 ± 3.2 13.7 ± 2.3
CAA, average, degrees
 Preoperative 157.2 ± 7.9 150.8 ± 5.8 154.3 ± 7.5 154.3 ± 8.2
 Postoperative 155.3 ± 6.2 155.2 ± 6.2 155.3 ± 5.9 158.1 ± 7.2
C1/2 angle, average, degrees
 Preoperative 21.7 ± 6.4 27.0 ± 14.8 21.0 ± 3.4 15.5 ± 10.6
 Postoperative 23.0 ± 8.6 28.3 ± 12.7 21.0 ± 9.4 19.7 ± 8.1
ADI flex/ext., average, mm
 Preoperative 7.8 ± 2.8/5.3 ± 2.9 6.5 ± 1.9/4.5 ± 1.9 7.7 ± 2.2/3.4 ± 1.7 9.1 ± 3.1/4.3 ± 2.7
 Postoperative 8.3 ± 2.6/5.7 ± 3.1 8.0 ± 3.5/5.0 ± 2.9 3.9 ± 1.8/3.9 ± 1.3 3.9 ± 2.5/3.9 ± 2.5
ADI neutral, average, mm
 Preoperative 6.4 ± 3.1 6.1 ± 1.9 5.9 ± 1.3 8.6 ± 3.2
 Postoperative 6.3 ± 3.2 5.8 ± 3.6 3.9 ± 1.3* 3.8 ± 2.5*
ΔADI 0.2 ± 1.0 0.3 ± 1.9 2.0 ± 1.3 4.7 ± 3.5
C2–7 angles, average, degrees
 Preoperative 12.2 ± 17.7 8.6 ± 4.5 4.9 ± 12.5 11.6 ± 15.1
 Postoperative 5.8 ± 17.7 − 0.8 ± 7.8* 4.9 ± 8.7 3.1 ± 15.8
Cervical SVA, average, mm
 Preoperative 37.8 ± 15.8 43.5 ± 13.2 14.9 ± 12.6 10.6 ± 15.9
 Postoperative 43.8 ± 21.5 40.0 ± 22.9 18.6 ± 18.2 16.8 ± 14.3
C-JOA score, average, points
 Preoperative 6.9 ± 3.5 10.5 ± 4.1 9.7 ± 3.6 9.9 ± 4.1
 Postoperative 8.5 ± 3.2 14.3 ± 2.8 10.6 ± 3.2 14.5 ± 2.0*♰
Recovery rate of C-JOA score, average, % 16.1 ± 6.8 67.4 ± 21.8 11.7 ± 28.3 72.0 ± 21.7
Complications, no. AAF = 1 (16.7%) Hematoma = 1 (20.0%) Septic emboli = 1 SSI = 1 VS = 1 (42.9%) SSI = 1 DSI = 1 AAF = 2 (33.3%)
Revision, no. 1 (16.7%) 1 (20.0%) 2 (28.6%) 3 (25.0%)
  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, 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 poor outcome group