Results 161 to 170 of about 128,782 (181)
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Comparison of Pedicle Screw Loosening Mechanisms and the Effect on Fixation Strength
Journal of Biomechanical Engineering, 2015Screw 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 ...
Hedayeh, Mehmanparast +2 more
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Bone Mineral Density Surrounding the Screw Thread Predicts the Risk of Pedicle Screw Loosening
Journal of BiomechanicsScrew loosening remains a serious complication for patients undergoing pedicle screw fixation surgeries. An accurate risk prediction is significant for prevention of screw loosening through preoperative planning. In this study, we proposed a novel index, namely the bone mineral density surrounding the screw thread (thread BMD), and tested its ...
YANG Haisheng
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A New Test Method for In Vitro Evaluation of Pedicle Screw Loosening Potential
Journal of Medical Devices, 2021Abstract This paper proposes a new test method based on the toggle effect under transverse loads (cranial–caudal) to investigate the loosening potential of pedicle screw designs. A three-step in vitro testing procedure was developed to mimic the loosening mechanism of pedicle screws.
Otávio Teixeira Pinto +3 more
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Caudo-Cephalad Loading of Pedicle Screws
Spine, 1993The mechanism of failure and the effect of augmentation of single pedicle screws subjected to caudo-cephalad loads applied at the screw head were investigated. In each of 10 lumbar vertebrae, Steffee pedicle screws of appropriate diameter were placed in one pedicle.
M, Law, A F, Tencer, P A, Anderson
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[Intraoperative revision of initially loosened pedicle screws].
Operative Orthopadie und Traumatologie, 2019Intraoperative revision of initially loosened pedicle screws.Intraoperatively loosened/stripped pedicle screws.None.Removal of the loosened/stripped pedicle screw. Checking the screw channel and re-implantation using a different trajectory, a larger screw diameter or a cement-augmented pedicle screw.Early functional mobilization and initiation of ...
Lukas, Weiser +3 more
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Volume 1B: Extremity; Fluid Mechanics; Gait; Growth, Remodeling, and Repair; Heart Valves; Injury Biomechanics; Mechanotransduction and Sub-Cellular Biophysics; MultiScale Biotransport; Muscle, Tendon and Ligament; Musculoskeletal Devices; Multiscale Mechanics; Thermal Medicine; Ocular Biomechanics; Pediatric Hemodynamics; Pericellular Phenomena; Tissue Mechanics; Biotransport Design and Devices; Spine; Stent Device Hemodynamics; Vascular Solid Mechanics; Student Paper and Design Competitions, 2013
Osteoporosis is a critical challenge in orthopedic surgery. Osteoporotic patients have an increased risk of loosening and failure of implant constructs due to a weaker bone-implant interface than with healthy bone. Pullout strength of pedicle screws is enhanced by increased screw insertion depth.
Laura E. Buckenmeyer +5 more
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Osteoporosis is a critical challenge in orthopedic surgery. Osteoporotic patients have an increased risk of loosening and failure of implant constructs due to a weaker bone-implant interface than with healthy bone. Pullout strength of pedicle screws is enhanced by increased screw insertion depth.
Laura E. Buckenmeyer +5 more
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Aseptic Loosening of Pedicle Screw As a Result of Metal Wear Debris in a Pediatric Patient
Spine, 2013This is a case report.To report a case of soft-tissue reaction to wear debris and osteolysis around a pedicle screw after posterior spine fusion in a pediatric patient.Posterior spine fusion with instrumentation is a standard procedure for stabilization and curve correction in patients with scoliosis.
Sergiu, Botolin +2 more
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Archives of Orthopaedic and Trauma Surgery, 2011
The aim of this study is to compare the rate of screw loosening and clinical outcomes of expandable pedicle screws (EPS) with those of conventional pedicle screws (CPS) in patients treated for spinal stenosis (SS) combined with osteoporosis.One hundred and fifty-seven consecutive patients with SS received either EPS fixation (n = 80) or CPS fixation (n
Zi-xiang, Wu +8 more
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The aim of this study is to compare the rate of screw loosening and clinical outcomes of expandable pedicle screws (EPS) with those of conventional pedicle screws (CPS) in patients treated for spinal stenosis (SS) combined with osteoporosis.One hundred and fifty-seven consecutive patients with SS received either EPS fixation (n = 80) or CPS fixation (n
Zi-xiang, Wu +8 more
openaire +2 more sources
Journal of Mechanics in Medicine and Biology, 2019
Pedicle screw loosening at the bone–screw interface is the main complication in pedicle screw fixation. The transpedicular polymethylmethacrylate screw augmentation technique has recently become the general technique used to re-operatively overcome pedicle screw loosening. This study investigates the fatigue resistance of PMMA bone cement augmentation.
PO-YI LIU +3 more
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Pedicle screw loosening at the bone–screw interface is the main complication in pedicle screw fixation. The transpedicular polymethylmethacrylate screw augmentation technique has recently become the general technique used to re-operatively overcome pedicle screw loosening. This study investigates the fatigue resistance of PMMA bone cement augmentation.
PO-YI LIU +3 more
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Biomechanical Aspects of Pedicle Screw Loosening in the Lumbar Spine
The Spine Journal, 2011Joel Boerckel +6 more
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