Table 5 Comparison of the malposition of screws in case classification.

From: Three-Dimensional Printed Model-Assisted Screw Installation in Treating Posterior Atlantoaxial Internal Fixation

Group

Grade 0

Grade 1

Grade 2

P value

Group A I

162

60

2

0.000#

Group B I

157

19

0

Group A II

17

11

0

0.026#

Group B II

18

2

0

Group A III

7

9

0

0.003#

Group B III

21

3

0

Group A IV

20

16

0

0.026#

Group B IV

23

5

0

  1. (I) Atlantoaxial fracture and dislocation (II) Congenital odontoid nonunion.
  2. (III) Atlantoaxial Instability due rheumatoid arthritis. (IV) Other causes of atlantoaxial instability.
  3. #P < 0.05 compared to the data of Group A.
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