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Table 3 demonstrates the 405 lateral mass screw positions as evaluated by post op CT scan

From: Decompressive cervical laminectomy and lateral mass screw-rod arthrodesis. Surgical analysis and outcome

Screw position assessed by CT scan (number: 785 ) number%
appropriate obtain 765 97.5
Violation of foramen transversarium by less than 1 mm. 7 0.8
Breaching of neural foramen 5 0.6
Entering the spinal canal 0 0
Violation facet joint 8 1.1