STUDY DESIGN: The stabilizing potential of the Caspar Trapezial Osteosynthetic Plate was studied using unicortical and bicortical screw placement in cadaveric cervical spines. OBJECTIVE: To determine if Caspar plates secured with unicortical screws provide the same degree of stability as those anchored with unlocked bicortical screws. SUMMARY OF BACKGROUND DATA: Previous work has demonstrated that bicortical cervical vertebral screws are superior to unicortical screws in terms of pullout strength and decreased wobble. However, these two methods of plate fixation have not been directly compared in a clinically relevant cadaveric model. METHODS: The immediate and post-fatigue stabilizing potential of Caspar plates secured with unicortical or bicortical screws was assessed using a model of complete segmental instability. RESULTS: Unicortical screw placement resulted in inadequate stabilization in half of the cervical specimens. CONCLUSIONS: Our results suggest that, for the Caspar screw, bicortical fixation provides greater flexion-extension stability.
STUDY DESIGN: The stabilizing potential of the Caspar Trapezial Osteosynthetic Plate was studied using unicortical and bicortical screw placement in cadaveric cervical spines. OBJECTIVE: To determine if Caspar plates secured with unicortical screws provide the same degree of stability as those anchored with unlocked bicortical screws. SUMMARY OF BACKGROUND DATA: Previous work has demonstrated that bicortical cervical vertebral screws are superior to unicortical screws in terms of pullout strength and decreased wobble. However, these two methods of plate fixation have not been directly compared in a clinically relevant cadaveric model. METHODS: The immediate and post-fatigue stabilizing potential of Caspar plates secured with unicortical or bicortical screws was assessed using a model of complete segmental instability. RESULTS: Unicortical screw placement resulted in inadequate stabilization in half of the cervical specimens. CONCLUSIONS: Our results suggest that, for the Caspar screw, bicortical fixation provides greater flexion-extension stability.
Authors: Heiko Koller; Axel Hempfing; Luis Ferraris; Oliver Maier; Wolfgang Hitzl; Peter Metz-Stavenhagen Journal: Eur Spine J Date: 2007-06-29 Impact factor: 3.134
Authors: Mathew Cyriac; Justin Kyhos; Uchechi Iweala; Danny Lee; Matthew Mantell; Warren Yu; Joseph R O'Brien Journal: Int J Spine Surg Date: 2018-08-15
Authors: Patrícia Silva; Rodrigo César Rosa; Antonio Carlos Shimano; Francisco José Albuquerque de Paula; José Batista Volpon; Helton Luiz Aparecido Defino Journal: Rev Bras Ortop Date: 2015-11-17