Comment on

• Stereotactic navigation with the O-arm for placement of S-2 alar iliac screws in pelvic lumbar fixation.

  Ray WZ, Ravindra VM, Schmidt MH, Dailey AT. Ray WZ, et al. J Neurosurg Spine. 2013 May;18(5):490-5. doi: 10.3171/2013.2.SPINE12813. Epub 2013 Mar 15. J Neurosurg Spine. 2013. PMID: 23495892
• Letter to the editor: The O-arm revolution in spine surgery.

  Mattei TA, Fassett DR. Mattei TA, et al. J Neurosurg Spine. 2013 Nov;19(5):644-7. doi: 10.3171/2013.5.SPINE13474. Epub 2013 Sep 20. J Neurosurg Spine. 2013. PMID: 24053374 No abstract available.