Comparative Study

Incidence of and risk factors for superior facet violation in minimally invasive versus open pedicle screw placement during transforaminal lumbar interbody fusion: a comparative analysis.

J Neurosurg Spine. 2013 Apr 1;18(4):356-61.
Randomized Controlled Trial

Accuracy of robot-assisted placement of lumbar and sacral pedicle screws: a prospective randomized comparison to conventional freehand screw implantation.

Spine. 2012 Apr 15;37(8):E496-501.
Article

The biomechanical effect of pedicle screws' insertion angle and position on the superior adjacent segment in 1 segment lumbar fusion.

Spine. 2012 Sep 1;37(19):1637-44.