Biomechanical problems related to pedicle screw system
نویسندگان
چکیده
منابع مشابه
Biomechanical analysis of differing pedicle screw insertion angles.
BACKGROUND Pedicle screw fixation to stabilize lumbar spinal fusion has become the gold standard for posterior stabilization. A significant percentage of surgical candidates are classified as obese or morbidly obese. For these patients, the depth of the incisions and soft tissue makes it extremely difficult to insert pedicle screws along the pedicle axis. As such, the pedicle screws can only be...
متن کاملBiomechanical study of rotational micromovement of the pedicle screw
BACKGROUND In regard to the fixation using a pedicle screw (PS) and rod system, the mechanism from the onset of the clear zone up to the development of loosening of the pedicle screw is not completely clarified. The purpose of this study is to determine the cause of the pedicle screw loosening by performing a biomechanical study with three-dimensional movie analysis. METHODS Ten PS fixation m...
متن کاملBiomechanical Analysis of Pedicle Screw Fixation for Thoracolumbar Burst Fractures.
Treatment of unstable thoracolumbar burst fractures remains controversial. Long-segment pedicle screw constructs may be stiffer and impart greater forces on adjacent segments compared with short-segment constructs, which may affect clinical performance and long-term out come. The purpose of this study was to biomechanically evaluate long-segment posterior pedicle screw fixation (LSPF) vs short-...
متن کاملBiomechanical Evaluation of Diagonal Transfixation in Pedicle Screw Instrumentation
In pedicle screw instrumentation, it is common to use one or more transfixators that crosslink the longitudinal rods horizontally. Such a horizontal transfixation (HTF) of the longitudinal rods was shown to provide an additional stability in axial rotation and lateral bending but not in flexion extension. Most significant contribution of HTF was noted in axial rotational stability because the t...
متن کاملDesign and biomechanical study of a modified pedicle screw.
OBJECTIVE In pedicle screw fixation, the heads of monoaxial screws need to be directed in the same straight line to accommodate the rod placement by backing out during operation, which decreases the insertional torque and internal fixation strength. While polyaxial screws facilitate the assembly of the connecting rod, but its ball-in-cup locking mechanism reduces the static compressive bending ...
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ژورنال
عنوان ژورنال: Turkish Neurosurgery
سال: 2018
ISSN: 1019-5149
DOI: 10.5137/1019-5149.jtn.21002-17.2