Fig. 1

The intra-operative images. a, b Percutaneous anterior odontoid screw fixation was tried to perform first, but the trajectory of the K-wire was placed unsatisfactorily. c, d To solve the problem, percutaneous C1/2 transarticular screw fixation was performed; two 3.5-mm self-tapping cannulated transarticular screws were introduced via the previous skin wound for percutaneous anterior odontoid screw fixation