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Table 2 Radiographic measurement before and after surgery

From: Three-dimensional reduction method with a modified C2 isthmus screw in irreducible atlantoaxial dislocation: a technical note

Case Age Sex Diagnosis OC2A CCA CMA
Pre-op, degree* Post-op, degree* Pre-op, degree# Post-op, degree# Pre-op, degree& Post-op, degree&
1 65 M Fracture nonunion 15.9 8.5 123.5 145.4 147.9 158.9
2 66 F Rheumatoid arthritis 21.3 22.6 146.6 150 147 152
3 24 M Os odontoideum − 11.3 24.8 111.6 145.5 120.9 156.5
4 29 M Os odontoideum − 10.2 4.8 109.5 119.5 124.4 139.5
5 63 F Fracture nonunion − 4.6 11.1 143.3 158.2 146.1 153.1
6 32 F Os odontoideum − 3.8 16.6 126.5 136.5 143.9 154.2
7 60 F Rheumatoid arthritis 17.3 20 152.3 156.2 147.4 150.2
8 61 M Rheumatoid arthritis 28.4 26.9 155.9 171.3 152.3 166.7
9 43 M Fracture malunion 1.8 14.6 145.9 150.4 144.8 163.3
10 52 M Os odontoideum 10 18.3 151.3 158.5 143.6 150.2
11 13 F Developmental malformation 9.9 16.9 144 151.2 129 164.7
12 17 F Os odontoideum 24 31.5 146.5 142.1 156.8 152.6
Mean degree 8.2 ± 13.7 18.1 ± 7.7 138.1 ± 16 148.7 ± 12.9 142 ± 11.2 155.2 ± 7.5
  1. OC2A O-C2 angle; CCA clivus-canal angle; CMA cervicomedullary angle
  2. *P < 0.005 compared with pre-op OC2A
  3. #P < 0.005 compared with pre-op CCA
  4. #P < 0.005 compared with pre-op CMA