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. 2017 Feb 2;12(2):e0171509. doi: 10.1371/journal.pone.0171509

Fig 5. CT evaluation of pedicle screw fixation in upper cervical spine.

Fig 5

(A) Atlas pedicle screw was totally in vertebral pedicle, which was considered as type I. (B) Axis vertebral pedicle screw was totally in vertebral pedicle, which was considered as type I. (C) Atlas pedicle screw broke lateral cortex of pedicle with a distance of 0.60 mm, which considered as type II. (D) Axis vertebral pedicle screw broke lateral cortex of pedicle with a distance of 4.60 mm, which was considered as type III.