Comparison of Pedicle Screw Loosening Mechanisms and the Effect on Fixation Strength

被引：20
作者：
Mehmanparast, Hedayeh [1 ,2 ]
Petit, Yvan [1 ,2 ]
Mac-Thiong, Jean-Marc [2 ,3 ]
机构：
[1] Ecole Technol Super, Dept Mech Engn, West Montreal, PQ H3C 1K3, Canada
[2] Hop Sacre Coeur, Res Ctr, West Montreal, PQ H4J 1C5, Canada
[3] Univ Montreal, Dept Surg, Montreal, PQ H3T 1C5, Canada
来源：
JOURNAL OF BIOMECHANICAL ENGINEERING-TRANSACTIONS OF THE ASME | 2015年 / 137卷 / 12期
基金：
加拿大自然科学与工程研究理事会;
关键词：
biomechanics; spine; pedicle screw; loosening; fixation strength; pullout force; stiffness; BONE-MINERAL DENSITY; PULLOUT STRENGTH; LUMBAR SPINE; CEMENT AUGMENTATION; INSERTIONAL TORQUE; IN-VITRO; COMPLICATIONS; STABILITY; QUALITY; MODEL;
D O I：
10.1115/1.4031821
中图分类号：
Q6 [生物物理学];
学科分类号：
071011 ;
摘要：
Screw loosening is a common complication in spinal fixation using pedicle screws which may lead to loss of correction and revision surgery. The mechanisms of pedicle screw loosening are not well understood. The purpose of this study was to compare the pedicle screw pullout force and stiffness subsequent or not to multidirectional cyclic bending load (toggling). Pedicle screws inserted into porcine lumbar vertebrae underwent toggling in craniocaudal (CC), mediolateral (ML) directions, and no toggling (NT) before pullout. This study suggests that toggling and in particular CC toggling should be included in biomechanical evaluation of pedicle screw fixation strength.
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页数：7
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