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Figure 6 :Classification of pedicle screw violations: (a) Grade I: These are not true violations once the screw replaced the pedicular cortex without extending beyond it; (b) Grade II: The pedicle screw extends less than 2 mm beyond the pedicle cortex; (c) Grade III: The pedicle screw extends more than 2 mm outside of the cortical margin; (d) False Grade III violations: Intentional lateral violation of the pedicle in the thoracic spine with the screwing entering through the costovertebral joint; (e) True Grade III lateral violation; (f) Pedicle screw considered to be in an acceptable position

Figure 6 :Classification of pedicle screw violations: (a) Grade I: These are not true violations once the screw replaced the pedicular cortex without extending beyond it; (b) Grade II: The pedicle screw extends
less than 2 mm beyond the pedicle cortex; (c) Grade III: The pedicle screw extends more than 2 mm outside of the cortical margin; (d) False Grade III violations: Intentional lateral violation of the pedicle in the
thoracic spine with the screwing entering through the costovertebral joint; (e) True Grade III lateral violation; (f) Pedicle screw considered to be in an acceptable position