Full Text Journal Articles by
Author Phillip Reyes

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Comparing the Biomechanical Stability of Cortical Screw Trajectory Versus Standard Pedicle Screw Trajectory for Short- and Long-Segment Posterior Fixation in 3-Column Thoracic Spinal Injury.

Amey R Savardekar, Nestor G Rodriguez-Martinez, Anna G U S Newcomb, Phillip M Reyes, Hector Soriano-Baron, Steve W Chang, Brian P Kelly, Neil R Crawford,

<h4>Background</h4>Information on the performance of posterior fixation with cortical screw (CS) versus pedicle screw (PS) trajectories for stabilizing thoracolumbar burst fractures is limited. Therefore, we sought to analyze stability with CS versus PS in short- and long-segment fixations using a 3-column spinal injury model.<h4>Methods</h4>Nondestructive flexibility tests: (1) intact, (2) intact + short ... Read more >>

Int J Spine Surg (International journal of spine surgery)
[2019, 13(3):245-251]

Cited: 0 times

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Biomechanical Evaluation of Cervicothoracic Junction Fusion Constructs.

Jakub Godzik, Jonathan F Dalton, Eduardo Martinez-Del-Campo, Anna G U S Newcomb, Felix Dominguez, Phillip M Reyes, Nicholas Theodore, Brian P Kelly, Neil R Crawford,

<h4>Objective</h4>We studied the effect of different cervicothoracic construct design variables on biomechanical stability in vitro.<h4>Methods</h4>Six fresh-frozen human cadaveric spines (C5-T4) were used. After intact analysis, each specimen was destabilized and reconstructed, with all groups having 4.0-mm pedicle screws placed at T1-T3. The 2 hook-rod constructs included interlaminar hooks at C6 and ... Read more >>

World Neurosurg (World neurosurgery)
[2018, :]

Cited: 1 time

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Biomechanical evaluation of interbody fixation with secondary augmentation: lateral lumbar interbody fusion versus posterior lumbar interbody fusion.

Jakub Godzik, Samuel Kalb, Marco T Reis, Phillip M Reyes, Vaneet Singh, Anna G U S Newcomb, Steve W Chang, Brian P Kelly, Neil R Crawford,

<h4>Background</h4>Many approaches to the lumbar spine have been developed for interbody fusion. The biomechanical profile of each interbody fusion device is determined by the anatomical approach and the type of supplemental internal fixation. Lateral lumbar interbody fusion (LLIF) was developed as a minimally invasive technique for introducing hardware with higher ... Read more >>

J Spine Surg (Journal of spine surgery (Hong Kong))
[2018, 4(2):180-186]

Cited: 1 time

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Contribution of Neural Elements to Thoracic Stability.

Fatih Ersay Deniz, Phillip M Reyes, Bruno C R Lazaro, Felix C Dominguez, Anna G U S Newcomb, Volker K H Sonntag, Neil R Crawford,

<h4>Aim</h4>Studies of spinal biomechanics typically do not focus on the contributions to range of motion (ROM) of the primary components of the spinal canal, dura, arachnoid, pia, spinal cord, nerve roots, ligaments, and vessels. We sought to determine the stability offered by these soft tissues in vitro.<h4>Material and methods</h4>Human cadaveric ... Read more >>

Turk Neurosurg (Turkish neurosurgery)
[2017, 27(4):631-635]

Cited: 0 times

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Feasibility and Biomechanics of Multilevel Arthroplasty and Combined Cervical Arthrodesis and Arthroplasty.

Sam Safavi-Abbasi, Phillip M Reyes, Celeste Abjornson, Neil R Crawford,

<h4>Study design</h4>A new experimental protocol was applied utilizing a simplified postural control model. Multiple constructs were tested nondestructively by interconnecting segmental rods to screws.<h4>Objective</h4>To investigate how posture and distribution of segmental angles under physiological loads are affected by combined cervical arthroplasty and fusion.<h4>Summary of background data</h4>Previous studies of biomechanics of ... Read more >>

Clin Spine Surg (Clinical spine surgery)
[2016, 29(10):E522-E531]

Cited: 5 times

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Biomechanical Evaluation of Lumbar Decompression Adjacent to Instrumented Segments.

Peter Grunert, Phillip M Reyes, Anna G U S Newcomb, Sara B Towne, Brian P Kelly, Nicholas Theodore, Roger Härtl,

<h4>Background</h4>Multilevel lumbar stenosis, in which 1 level requires stabilization due to spondylolisthesis, is routinely treated with multilevel open laminectomy and fusion. We hypothesized that a minimally invasive (MI) decompression is biomechanically superior to open laminectomy and may allow decompression of the level adjacent the spondylolisthesis without additional fusion.<h4>Objective</h4>To study the ... Read more >>

Neurosurgery (Neurosurgery)
[2016, 79(6):895-904]

Cited: 6 times

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Biomechanical evaluation of lateral lumbar interbody fusion with secondary augmentation.

Marco T Reis, Phillip M Reyes, Bse, Idris Altun, Anna G U S Newcomb, Vaneet Singh, Steve W Chang, Brian P Kelly, Neil R Crawford,

OBJECTIVE Lateral lumbar interbody fusion (LLIF) has emerged as a popular method for lumbar fusion. In this study the authors aimed to quantify the biomechanical stability of an interbody implant inserted using the LLIF approach with and without various supplemental fixation methods, including an interspinous plate (IP). METHODS Seven human ... Read more >>

J Neurosurg Spine (Journal of neurosurgery. Spine)
[2016, 25(6):720-726]

Cited: 7 times

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Biomechanics of transvertebral screw fixation in the thoracic spine: an in vitro study.

Nestor G Rodriguez-Martinez, Amey Savardekar, Eric W Nottmeier, Stephen Pirris, Phillip M Reyes, Anna G U S Newcomb, George A C Mendes, Samuel Kalb, Nicholas Theodore, Neil R Crawford,

OBJECTIVE Transvertebral screws provide stability in thoracic spinal fixation surgeries, with their use mainly limited to patients who require a pedicle screw salvage technique. However, the biomechanical impact of transvertebral screws alone, when they are inserted across 2 vertebral bodies, has not been studied. In this study, the authors assessed ... Read more >>

J Neurosurg Spine (Journal of neurosurgery. Spine)
[2016, 25(2):187-192]

Cited: 2 times

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Biomechanics of a Posterior Lumbar Motion Stabilizing Device: In Vitro Comparison to Intact and Fused Conditions.

Luis Perez-Orribo, James F Zucherman, Kenneth Y Hsu, Phillip M Reyes, Nestor G Rodriguez-Martinez, Neil R Crawford,

Nondestructive flexibility tests were performed in vitro, comparing multiple conditions of fixation in a single group of specimens.To compare the biomechanical behavior of the lumbar spine in the intact condition, after implanting a novel motion stabilizer, and after implanting a rigid fixator.Two specific scenarios that may benefit from dynamic lumbar ... Read more >>

Spine (Phila Pa 1976) (Spine)
[2016, 41(2):E55-63]

Cited: 3 times

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The role of obesity in the biomechanics and radiological changes of the spine: an in vitro study.

Nestor G Rodriguez-Martinez, Luis Perez-Orribo, Samuel Kalb, Phillip M Reyes, Anna G U S Newcomb, Jeremy Hughes, Nicholas Theodore, Neil R Crawford,

<h4>Object</h4>The effects of obesity on lumbar biomechanics are not fully understood. The aims of this study were to analyze the biomechanical differences between cadaveric L4-5 lumbar spine segments from a large group of nonobese (body mass index [BMI] < 30 kg/m2) and obese (BMI ≥ 30 kg/m2) donors and to ... Read more >>

J Neurosurg Spine (Journal of neurosurgery. Spine)
[2016, 24(4):615-623]

Cited: 9 times

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Biomechanics of posterior instrumentation in L1-L3 lateral interbody fusion: Pedicle screw rod construct vs. transfacet pedicle screws.

Kingsley R Chin, Anna G U Newcomb, Marco T Reis, Phillip M Reyes, Grace A Hickam, Josue Gabriel, Fabio J R Pencle, Roger D Sung, Neil R Crawford,

The use of pedicle screws is the gold standard for supplemental posterior fixation in lateral interbody fusion. Information about the performance of transfacet pedicle screws compared to standard pedicle screws and rods in the upper lumbar spine with or without a lateral interbody fusion device in place is limited.Fifteen fresh ... Read more >>

Clin Biomech (Bristol, Avon) (Clinical biomechanics (Bristol, Avon))
[2016, 31:59-64]

Cited: 3 times

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Biomechanics of Nested Transforaminal Lumbar Interbody Cages.

Hector Soriano-Baron, Anna G U S Newcomb, Devika Malhotra, Kaylee de Tranaltes, Eduardo Martinez-Del-Campo, Phillip M Reyes, Neil R Crawford, Nicholas Theodore, Luis M Tumialán,

<h4>Background</h4>Arthrodesis is optimized when the structural graft occupies most of the surface area within a disc space. The transforaminal corridor inherently limits interbody size.<h4>Objective</h4>To evaluate the biomechanical implications of nested interbody spacers (ie, a second curved cage placed behind a first) to increase disc space coverage in transforaminal approaches.<h4>Methods</h4>Seven lumbar ... Read more >>

Neurosurgery (Neurosurgery)
[2016, 78(2):297-304]

Cited: 1 time

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The effect of implant placement on sacroiliac joint range of motion: posterior versus transarticular.

Hector Soriano-Baron, Derek P Lindsey, Nestor Rodriguez-Martinez, Phillip M Reyes, Anna Newcomb, Scott A Yerby, Neil R Crawford,

A human cadaveric biomechanical study of 2 sacroiliac (SI) joint fusion implant placement techniques.To evaluate and compare the biomechanical properties of 2 implant placement techniques for SI joint fusion.Minimally invasive placement of SI joint fusion implants is a potential treatment of SI joint disruptions and degenerative sacroiliitis. Biomechanical studies of ... Read more >>

Spine (Phila Pa 1976) (Spine)
[2015, 40(9):E525-30]

Cited: 14 times

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Biomechanics of a flexible sublaminar connector in long-segment thoracic fixation.

Nestor G Rodriguez-Martinez, Sam Safavi-Abbasi, Luis Perez-Orribo, Anna G U S Newcomb, Phillip M Reyes, Galyna Loughran, Nicholas Theodore, Neil R Crawford,

OBJECT The Universal Clamp Spinal Fixation System (UC) is a novel sublaminar connection for the spine that is currently used in conjunction with pedicle screws at the thoracic levels for the correction of scoliosis. This device allows the surgeon to attach rods and incorporate a pedicle screw construction. The flexible ... Read more >>

J Neurosurg Spine (Journal of neurosurgery. Spine)
[2016, 24(2):340-346]

Cited: 2 times

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Biomechanical assessment of anchored cervical interbody cages: comparison of 2-screw and 4-screw designs.

Marco T Reis, Phillip M Reyes, Neil R Crawford,

<h4>Background</h4>A new anchored cervical interbody polyetheretherketone spacer was devised that uses only 2 integrated variable-angle screws diagonally into the adjacent vertebral bodies instead of the established device that uses 4 diagonal fixed-angle screws.<h4>Objective</h4>To compare in vitro the stability provided by the new 2-screw interbody spacer with that of the 4-screw ... Read more >>

Neurosurgery (Neurosurgery)
[2014, 10 Suppl 3:412-7; discussion 417]

Cited: 3 times

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Evaluation of a minimally invasive procedure for sacroiliac joint fusion - an in vitro biomechanical analysis of initial and cycled properties.

Derek P Lindsey, Luis Perez-Orribo, Nestor Rodriguez-Martinez, Phillip M Reyes, Anna Newcomb, Alexandria Cable, Grace Hickam, Scott A Yerby, Neil R Crawford,

<h4>Introduction</h4>Sacroiliac (SI) joint pain has become a recognized factor in low back pain. The purpose of this study was to investigate the effect of a minimally invasive surgical SI joint fusion procedure on the in vitro biomechanics of the SI joint before and after cyclic loading.<h4>Methods</h4>SEVEN CADAVERIC SPECIMENS WERE TESTED ... Read more >>

Med Devices (Auckl) (Medical devices (Auckland, N.Z.))
[2014, 7:131-137]

Cited: 14 times

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Characteristics of immediate and fatigue strength of a dual-threaded pedicle screw in cadaveric spines.

Leonardo B C Brasiliense, Bruno C R Lazaro, Phillip M Reyes, Anna G U S Newcomb, Joseph L Turner, Dennis G Crandall, Neil R Crawford,

<h4>Background context</h4>Novel dual-threaded screws are configured with overlapping (doubled) threads only in the proximal shaft to improve proximal cortical fixation.<h4>Purpose</h4>Tests were run to determine whether dual-threaded pedicle screws improve pullout resistance and increase fatigue endurance compared with standard pedicle screws.<h4>Study design/setting</h4>In vitro strength and fatigue tests were performed in human ... Read more >>

Spine J (The spine journal : official journal of the North American Spine Society)
[2013, 13(8):947-956]

Cited: 13 times

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Biomechanical evaluation of a metal-on-metal cervical intervertebral disc prosthesis.

Kyle O Colle, John B Butler, Phillip M Reyes, Anna G U S Newcomb, Nicholas Theodore, Neil R Crawford,

<h4>Background context</h4>In vitro nondestructive flexibility testing of the CerviCore total disc replacement (TDR) was performed. It was hypothesized that TDR would not significantly alter biomechanics relative to intact, whereas rigid fixation would cause significant changes.<h4>Purpose</h4>To assess the ability of a cervical metal-on-metal saddle-shaped TDR to replicate normal biomechanics in vitro.<h4>Study ... Read more >>

Spine J (The spine journal : official journal of the North American Spine Society)
[2013, 13(11):1640-1649]

Cited: 12 times

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Biomechanics of dynamic rod segments for achieving transitional stiffness with lumbosacral fusion.

Bruno C R Lazaro, Phillip M Reyes, Anna G U S Newcomb, Ali S Yaqoobi, Leonardo B C Brasiliense, Volker K H Sonntag, Neil R Crawford,

<h4>Background</h4>Transitioning from rigid to flexible hardware at the distal rostral or caudal lumbar or lumbosacral level hypothetically maintains motion at the transition level and protects the transition level and intact adjacent levels from stresses caused by fusion.<h4>Objective</h4>To biomechanically compare transitional and rigid constructs with uninstrumented specimens in vitro.<h4>Methods</h4>Human cadaveric L2-S1 ... Read more >>

Neurosurgery (Neurosurgery)
[2013, 73(3):517-527]

Cited: 3 times

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Biomechanical evaluation of the craniovertebral junction after inferior-third clivectomy and intradural exposure of the foramen magnum: implications for endoscopic endonasal approaches to the cranial base.

Andrew S Little, Luis Perez-Orribo, Nestor G Rodriguez-Martinez, Phillip M Reyes, Anna G U S Newcomb, Daniel M Prevedello, Neil R Crawford,

<h4>Object</h4>Endoscopic endonasal approaches to the craniovertebral junction (CVJ) and clivus are increasingly performed for ventral skull-base pathology, but the biomechanical implications of these approaches have not been studied. The aim of this study was to investigate the spinal biomechanics of the CVJ after an inferior-third clivectomy and anterior intradural exposure ... Read more >>

J Neurosurg Spine (Journal of neurosurgery. Spine)
[2013, 18(4):327-332]

Cited: 4 times

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Stability of transforaminal lumbar interbody fusion in the setting of retained facets and posterior fixation using transfacet or standard pedicle screws.

Kingsley R Chin, Marco T Reis, Phillip M Reyes, Anna G U Newcomb, Anda Neagoe, Josue P Gabriel, Roger D Sung, Neil R Crawford,

<h4>Background context</h4>The transforaminal lumbar interbody fusion (TLIF) technique supplements posterior instrumented lumbar spine fusion and has been tested with different types of screw fixation for stabilization. Transforaminal lumbar interbody fusion is usually placed through a unilateral foraminal approach after unilateral facetectomy, although extraforaminal entry allows the facet to be spared.<h4>Purpose</h4>To ... Read more >>

Spine J (The spine journal : official journal of the North American Spine Society)
[2015, 15(5):1077-1082]

Cited: 7 times

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Biomechanical evaluation of the craniovertebral junction after anterior unilateral condylectomy: implications for endoscopic endonasal approaches to the cranial base.

Luis Perez-Orribo, Andrew S Little, Richard D Lefevre, Phillip R Reyes, Anna G U S Newcomb, Daniel M Prevedello, Hector Roldan, Peter Nakaji, Curtis A Dickman, Neil R Crawford,

<h4>Background</h4>: Endoscopic endonasal approaches to the craniovertebral junction and clivus, which are increasingly performed for ventral skull base pathology, may require disruption of the occipitocondylar joint.<h4>Objective</h4>: To study the biomechanical implications at the craniovertebral junction of progressive unilateral condylectomy as would be performed through an endonasal exposure.<h4>Methods</h4>: Seven upper cervical ... Read more >>

Neurosurgery (Neurosurgery)
[2013, 72(6):1021-29; discussion 1029-30]

Cited: 8 times

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Biomechanics of lumbar cortical screw-rod fixation versus pedicle screw-rod fixation with and without interbody support.

Luis Perez-Orribo, Samuel Kalb, Phillip M Reyes, Steve W Chang, Neil R Crawford,

<h4>Study design</h4>Seven different combinations of posterior screw fixation, with or without interbody support, were compared in vitro using nondestructive flexibility tests.<h4>Objective</h4>To study the biomechanical behavior of a new cortical screw (CS) fixation construct relative to the traditional pedicle screw (PS) construct.<h4>Summary of background data</h4>The CS is an alternative to the ... Read more >>

Spine (Phila Pa 1976) (Spine)
[2013, 38(8):635-641]

Cited: 63 times

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Biomechanical analysis of a novel hook-screw technique for C1-2 stabilization.

Marco Túlio Reis, Eric W Nottmeier, Phillip M Reyes, Seungwon Baek, Neil R Crawford,

<h4>Unlabelled</h4>The Food and Drug Administration has not cleared the following medical devices for the use described in this study. The following medical devices are being discussed for an off-label use: cervical lateral mass screws.<h4>Object</h4>As an alternative for cases in which the anatomy and spatial relationship between C-2 and a vertebral ... Read more >>

J Neurosurg Spine (Journal of neurosurgery. Spine)
[2012, 17(3):220-226]

Cited: 3 times

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Biomechanical contribution of the rib cage to thoracic stability.

Leonardo B C Brasiliense, Bruno C R Lazaro, Phillip M Reyes, Seref Dogan, Nicholas Theodore, Neil R Crawford,

<h4>Study design</h4>In vitro assessment of rib cage biomechanics in the region of true ribs with the ribs intact then sequentially resected in 5 steps.<h4>Objective</h4>To determine the contribution of the rib cage to thoracic spine stability and kinematics.<h4>Summary of background data</h4>Previous in vitro studies of rib cage biomechanics have used animal ... Read more >>

Spine (Phila Pa 1976) (Spine)
[2011, 36(26):E1686-93]

Cited: 28 times

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