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Table 1 General information and distance measurement of patients

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

Case Age Sex Diagnosis C1 PS + C2 PS C1 LMS + C2 PS C1 PS + modified C2 isthmus screw C1 LMS + modified C2 isthmus screw Follow-up duration, month
APD, mm DD, mm APD, mm DD, mm APD, mm* DD, mm* APD, mm# DD, mm#
1 65 M Fracture nonunion 3.8 20.8 14.6 21.5 11.5 36.9 22.3 37.7 86
2 66 F Rheumatoid arthritis 3.6 21.4 10.4 19.3 10.7 37.1 17.9 35.0 82
3 24 M Os odontoideum 7.0 24.5 14.5 22.5 14.5 37.0 21.5 35.0 32
4 29 M Os odontoideum 7.4 25.8 14.2 22.6 18.9 36.3 20.0 34.2 85
5 63 F Fracture nonunion 8.3 17.2 17.2 20.6 15.6 35.6 23.9 36.1 12
6 32 F Os odontoideum 5.5 25.5 11.0 25.5 11.0 44.5 16.5 39.5 85
7 60 F Rheumatoid arthritis 2.5 15.0 11.5 16.5 8.5 27.5 17.5 29.0 46
8 61 M Rheumatoid arthritis 3.1 12.7 5.0 13.5 5.0 26.9 13.1 30.0 46
9 43 M Fracture malunion 10.0 26.3 23.8 30.0 21.9 46.9 35.0 50.0 95
10 52 M Os odontoideum 13.0 26.5 24.5 31.0 21.5 45.0 33.0 48.0 46
11 13 F Developmental malformation 0.9 19.1 9.1 14.5 4.5 29.5 14.5 27.3 38
12 17 F Os odontoideum 1.9 13.8 10.0 15.6 6.9 25.0 15.0 26.9 93
Average distance 5.6 ± 3.5 20.7 ± 4.5 13.8 ± 5.5 21.1 ± 5.5 12.5 ± 5.8 35.7 ± 7 20.7 ± 4.9 35.7 ± 7.1 62.2
  1. LMS lateral mass screw; PS pedicle screw; APD anteroposterior distance; DD direct distance
  2. *P < 0.001 compared with APD and DD in C1 PS + C2 PS respectively
  3. #P < 0.001 compared with APD and DD in C1 LMS + C2 PS respectively