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7.5 degrees lateral and 5 degrees cephalad
10%
120/1207
7.5 degrees medial and 10 degrees cephalad
15%
187/1207
10 degrees medial and 22 degrees cephalad
54%
655/1207
10 degrees lateral and 22 degrees cephalad
17%
207/1207
20 degrees medial and 22 degrees caudal
1%
18/1207
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The C1 lateral mass can safely accommodate screw fixation. Trajectory of 10 degrees medial and 22 degrees cephalad was safely applied in a series of 50 patients. Postoperative CT scans confirmed the safe trajectory. The benefit of lateral mass screws is that they can be safely placed despite the existence of an anomalous vertebral artery that could preclude the safe placement of transarticular screws.
2.7
(37)
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