title: A protocol to evaluate semi-rigid pedicle screw systems.
abstract: The objective of the current study was to develop an in vitro testing protocol to evaluate semi-rigid pedicle screw devices. A corpectomy model protocol exists to evaluate rigid spinal implants; however, semi-rigid devices are contraindicated for this condition. This paper describes a technique that simulates more closely the conditions a semi-rigid device would see in vivo. Finally, the new testing protocol is used to evaluate the DDS pedicle screw-cable system. Benefits and shortcomings of the new protocol are discussed.
authors.affiliation: Iowa Spine Research Center, Department of Biomedical Engineering, University of Iowa, Iowa City 52242, USA.
authors.forename: J D
authors.initials: JD
authors.lastname: Clausen
authors.forename: V K
authors.initials: VK
authors.lastname: Goel
authors.forename: K
authors.initials: K
authors.lastname: Sairyo
authors.forename: M
authors.initials: M
authors.lastname: Pfeiffer
mesh_terms: D001863:Bone Screws; D004867:Equipment Design; D004868:Equipment Failure; D008422:Materials Testing; D013123:Spinal Fusion / Q000295:instrumentation*; D013718:Tensile Strength