Table 1 General information and distance measurement of patients
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 | |||