Table 2 Radiological data and indication for surgery.

From: The limitations of fully threaded screws in isolated percutaneous transarticular screw fixation of C1/C2

Patient

Indication for surgery

Fusion

Correct screw placement

Screw loosening

Radiography > 120 d post OP

1

combined JF and DF II

n

y

n

n

2

DF II

n

y

y

y

3

instable osteolytic lesion

n

y

n

n

4

combined EF II and DF II

n

y

n

y

5

instable osteolytic lesion

n

y

y

y

6

IPA after DF II

n

y

n

n

7

IPA after DF II

n

y

y

y

8

IPA after DF II

n

y

n

y

9

BF III

n

y

n

n

10

instable osteolytic lesion

n

y

n

n

11

BF III

n

y

n

n

12

BF III

n

y

n

n

13

IPA after DF II and ASF

n

y

y

y

14

GF II and DF II

X

X

X

n

15

AAI in RA

y

y

n

y

16

GF II

n

n

n

n

17

EF I

n

y

y

y

18

BF III

n

y

y

y

19

IPA after DF II and ASF

n

y

y

n

20

BF III

n

y

y

y

21

GF II

n

y

y

y

22

BF III

n

y

n

y

23

EF I

n

y

n

y

  1. JF Jefferson fracture, DF Dens axis fracture (Anderson and D’Alonzo), BF Benzel fracture, EF Effendi fracture, IPA instable pseudarthrosis, ASF anterior screw fixation, GF Gehweiler fracture, AAI atlantoaxial instability, RA rheumatoid arthritis, d days, n no, y yes, X no value available.