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. 2020 Apr 15;60(5):231–243. doi: 10.2176/nmc.ra.2019-0189

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© 2020 The Japan Neurosurgical Society The Japan Neurosurgical Society

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Fig. 2. — Anatomical considerations for a subaxial cervical pedicle screw. (A) The pedicle outer width (POW) ranges from 5.4 to 6.6 mm. The smallest mean POW of 4.5 mm is at C3, with gradual increases of the mean value caudally from C3 to C7. The overall mean pedicle transverse angle (PTA) ranges from 33.6° to 50.2°, approximately 45° from C3 to C6 and 33° at C7. (B) The pedicle axes at C3 and C4 are slightly elevated compared to the superior endplate of the vertebral body, and those at C5–C7 are parallel and directed slightly downward.