Orita, Sumihisa Radiographic evaluation of monocortical versus tricortical purchase approaches in lumbosacral fixation with sacral pedicle screws: a prospective study of ninety consecutive patients. [electronic resource] - Spine Oct 2010 - E1230-7 p. digital Publication Type: Comparative Study; Journal Article ISSN: 1528-1159 Standard No.: 10.1097/BRS.0b013e3181e5092c doi Subjects--Topical Terms: AdultAgedAged, 80 and overBone Screws--standardsContraindicationsFemaleFollow-Up StudiesHumansMaleMiddle AgedProspective StudiesRadiographySacrum--diagnostic imagingSpinal Fusion--instrumentationSpondylolisthesis--diagnostic imagingSpondylosis--diagnostic imagingTimeTreatment Outcome