pedicle screws
3D printed guided positioning of extreme pedicle screws to aid in vertebral derotation : A feasibility cadaver study to improve scoliosis surgery
... the pedicle screw led to increased use by scoliosis surgeons in the thoracic ...of pedicle screws are a secure 3-column fixation, superior control of the upper and lower instrumented vertebrae, and ...
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A study on clinicoradiological outcome of posterior and posterolateral decompression,stabilisation with pedicle screws and fusion for tuberculosis of dorsal and lumbar spine
... TUBERCULOSIS OF DORSAL A?D LUMBAR SPI?E DISSERTATIO? SUBMITTED FOR MASTER OF SURGERY DEGREE EXAMI?ATIO? BRA?CH – II (ORTHOPAEDIC SURGERY) APRIL 2013 THE TAMIL?ADU DR.M.G.R. MEDICAL U?IVERSITY CHE??AI, TAMIL?ADU 1 ...
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Minimally invasive unilateral pedicle screws and a translaminar facet screw fixation and interbody fusion for treatment of single-segment lower lumbar vertebral disease: surgical technique and preliminary clinical results
... Unilateral pedicle screws combined with a contralateral translami- nar facet screw fixation based on preoperative measured data were ...facet screws was good (type I, 53 cases with 54 segments; type ...
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Pullout strength of reinserted pedicle screws using the previous entry point and trajectory
... of pedicle screw instrumentation is to in- crease the stability of the ...reinserted pedicle screws was less than that of control screws in group A and ...reinserted screws were ...
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Analysis of in Situ Posterior Spinal Fusion with Pedicle Screws and Rods in Grade I and Grade II Isthmic and Degenerative Spondylolisthesis
... This is to certify that this dissertation entitled “Analysis of In situ Posterior Spinal Fusion With Pedicle Screws and Rods in Grade I and Grade II Isthmic and Degenerative Spondylolisthesis”, submitted by ...
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Unilateral pedicle screws asymmetric tethering: an innovative method to create idiopathic deformity
... caudal pedicle screws implantation and ipsilateral (right) rib resection (Fig ...two pedicle screws at adjacent levels on left side of the spine, proximally at the T6,7 and distally at L1,2 ...
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Modified posterior lumbar interbody fusion using a single cage with unilateral pedicle screws: a retrospective clinical study
... transpedicle screws and ...unilateral pedicle screw fixation was weaker, but there were no significant differences than intact ...of pedicle screws improved stabilisation in all directions, ...
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Comparison and prediction of pullout strength of conical and cylindrical pedicle screws within synthetic bone
... face coating, and loading type [1-7,13,15,16,23-25]. In general, those studies revealed that 1) outer diameter is an important determinant of pullout strength in a roughly linear manner, 2) pitch is important with a ...
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Differences in bone mineral density of trajectory between lumbar cortical and traditional pedicle screws
... the pedicle representing the plane wherein pedicle screws were inserted using the TT and the other in a caudocranial plane representing the plane wherein pedicle screws were inserted ...
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Treatment of thoracolumbar burst fractures by short segment pedicle screw fixation using a combination of two additional pedicle screws and vertebroplasty at the level of the fracture: a finite element analysis
... the pedicle screws during all states of motion were ...intermediate pedicle screws together with calcium sulfate cement at the fractured vertebrae may provide a stiffer construct and less von ...
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Original Article Clinical application of small oblique view of thoracolumbar pedicle screws: a prospective study of new radiological assessment of pedicles screws
... with pedicle screws is the most used operations in spine ...the screws, the wrongly located screw may cause potential alarming complications such as neural damage, infre- quent vascular or visceral ...
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The methods for inserting lumbar bicortical pedicle screws from the anatomical perspective of the prevertebral great vessels
... Second, the ratio of the three types of PGV at each TSA of the BPSs in each lumbar vertebra was calculated. The higher the ratio of the close PGVs, the higher the risk of potential injury to the PGV. The participants’ ...
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Effect of different inner core diameters on structural strength of cannulated pedicle screws under various lumbar spine movements
... the pedicle screws, the intact finite element (FE) model of the lumbar spine was implanted with screws, rods, and bone graft elements to simulate spinal ...
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Biomechanical comparison of posterior intermediate screw fixation techniques with hybrid monoaxial and polyaxial pedicle screws in the treatment of thoracolumbar burst fracture: a finite element study
... a pedicle screw was located at the lowest pedicle screws, and the maximal adjacent segmental IDPs of the fixation model were larger than the other models in flexion and extension when Mps are fixed ...
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Pullout strength of pedicle screws with cement augmentation in severe osteoporosis: A comparative study between cannulated screws with cement injection and solid screws with cement pre filling
... nonaugmented pedicle screws using polyurethane foam with densities of ...cannulated screws inserted in polyurethane foam blocks with three differ- ent densities ...of screws is directly ...
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Fenestrated pedicle screws for cement-augmented purchase in patients with bone softening: a review of 21 cases
... pedicular screws in patients with poor bone ...of screws loosening in patients with poor bone stock due to osteoporosis and/or ...fenestrated pedicle screws and PMMA ...
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Comparison of outcomes between cortical screws and traditional pedicle screws for lumbar interbody fusion: a systematic review and meta-analysis
... resulting in longer surgical incisions, large intraoperative blood loss, and excessive muscle and soft tissue damage [8]. To overcome these troubles, Santoni et al. [9] first re- ported cortical bone trajectory (CBT) ...
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Biomechanical comparison of multilevel lateral interbody fusion with and without supplementary instrumentation: a three dimensional finite element study
... two screws (parallel to endplates) fixation (LPC), three lateral cages with bilat- eral pedicle screw and rod fixation (LC + BPSR), and three lateral cages with unilateral pedicle screw and rod ...
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Volume 7 | Issue 4 - 2017
... Fenestrated pedicle screws with cement augmentation in the dorsal, lumbar and sacral spine for treatment of traumatic, degenerative, infective and neoplastic conditions in Cairo University ...
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Is Freehand Technique of Pedicle Screw Insertion in Thoracolumbar Spine Safe and Accurate? Assessment of 250 Screws.
... Background: Pedicle screw fixation is one of the widely used procedures for instrumentation and stabilization of the thoracic and lumbar ...the pedicle screws more accurately but at the expense of ...
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