Table 1 Demographic data in atlantoaxial dislocation cases

1

Unknown

N/A

C1–2

2

Os odontoideum

N/A

C1–2

3

Unknown

N/A

C1–2

4

Rheumatoid arthritis

N/A

C1–2

5

Rheumatoid arthritis

N/A

C1–2

6

Atlas occipitalization, C2–3 fusion

N/A

C0–3

7

Rheumatoid arthritis

N/A

C1–2

8

Ankylosing spondylitis

Retropharyngeal

C1–2

9

Other malformation, posterior arch defect

N/A

C1–2

10

Atlas occipitalization

N/A

C0–2

11

Unknown

N/A

C1–2

12

Atlas occipitalization, C2–3 fusion

N/A

C0–3

13

Atlas occipitalization, C2–3 fusion

N/A

C0–3

14

Atlas occipitalization, C2–3 fusion

N/A

C0–3

15

Unknown

N/A

C0–2

16

Os odentium

N/A

C1–2

17

Atlas occipitalization, C2–3 fusion

N/A

C0–3

18

Atlas occipitalization, C2–3 fusion

Transoral

C0–3

19

Atlas occipitalization

N/A

C0–2

20

Atlas occipitalization

N/A

C0–2

21

Os odontoideum

N/A

C1–2

22

Odontoid fracture nonunion

N/A

C1–2

23

Unknown

N/A

C1–2

24

Unknown

N/A

C1–2

25

Atlas occipitalization

N/A

C0–2

26

Atlas occipitalization

Retropharyngeal

C0–2

27

Atlas occipitalization

N/A

C0–2

28

Os odontoideum

N/A

C1–2

29

Os odontoideum

N/A

C1–2

30

Atlas occipitalization

N/A

C0–2

31

Atlas occipitalization, C2–3 fusion

Retropharyngeal

C0–3

32

Os odontoideum

N/A

C1–2

33

Os odontoideum

N/A

C1–2

34

Other malformation, C2–3 fusion

N/A

C1–2

35

Atlas occipitalization, C2–3 fusion

Transoral

C0–3

36

Atlas occipitalization, C2–3 fusion

N/A

C0–3

37

Atlas occipitalization, C2–3 fusion

Retropharyngeal

C0–4