Higher fusion rate and higher risk with C2 pedicle compared to C2 pars screws .
Comparison of safety and stability of C-2 pars and pedicle screws for atlantoaxial fusion: meta-analysis and review of the literature
J Neurosurg Spine. 2012 Dec;17(6):577-93. doi: 10.3171/2012.9.SPINE111021. Epub 2012 Oct 5This meta-analysis and systematic review included 38 articles comparing outcomes of vertebral artery injury, screw malposition and successful arthrodesis related to C-2 pedicle and pars screws in atlantoaxial fusion. The results demonstrated a lower risk of vertebral artery injury with pars screws (1.1% vs 1.5%), but higher rate of successful fusion with pedicle screws (98% vs 94%). Differences in clinically significant screw malpositions between groups was not observed.
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