Search Results - "Krag, M. H."

Biomechanics of thoracolumbar spinal fixation. A review by Krag, M H

“…Extensive development of spinal instrumentation has occurred recently, benefitted by improved biomechanical knowledge. Reviewed here are various devices and…”
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A poroelastic finite element formulation including transport and swelling in soft tissue structures by Simon, B R, Liable, J P, Pflaster, D, Yuan, Y, Krag, M H

“…A field theory is presented for the study of swelling in soft tissue structures that are modeled as poroelastic materials. As a first approximation, soft…”
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Effect of test environment on intervertebral disc hydration by PFLASTER, D. S, KRAG, M. H, JOHNSON, C. C, HAUGH, L. D, POPE, M. H

“…Water content of fresh human lumbar intervertebral discs (with adjacent endplates) was assessed in three studies: 1) after each of seven specimen preparation…”
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Screw fixation in the human sacrum. An in vitro study of the biomechanics of fixation by Carlson, G D, Abitbol, J J, Anderson, D R, Krag, M H, Kostuik, J P, Woo, S L, Garfin, S R

“…A load-to-failure test was used to study the biomechanical properties of sacral screw fixation in human cadaveric specimens. The goals of this study were 1) to…”
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Pin loosening in a halo-vest orthosis: A biomechanical study by FLEMING, B. C, KRAG, M. H, HUSTON, D. R, SUGIHARA, S

“…The cranial pin force history of a halo-vest orthosis was measured using an instrumented halo in a clinical study with three patients. Pin force values at the…”
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Repeatability of four clinical methods for assessment of lumbar spinal motion by Gill, K, Krag, M H, Johnson, G B, Haugh, L D, Pope, M H

“…Spinal motion usually is recorded from subjective observation of the fully flexed trunk using a goniometer or the distance from the fingertips to the floor. To…”
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Morphometry of the thoracic and lumbar spine related to transpedicular screw placement for surgical spinal fixation by Krag, M H, Weaver, D L, Beynnon, B D, Haugh, L D

“…Vertebral transpedicular screws provide secure attachment for posterior spinal fixation devices. Screw design details, biomechanics, and implantation safety…”
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Body height change during upright and recumbent posture by Krag, M H, Cohen, M C, Haugh, L D, Pope, M H

“…Body height changes are known to occur in response to changes in loads acting along the spine, such as those produced by movement from a recumbent to an…”
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Biomechanical response to acupuncture needling in humans by Langevin, Helene M, Churchill, David L, Fox, James R, Badger, Gary J, Garra, Brian S, Krag, Martin H

“…1  Departments of Neurology, 2  Orthopaedics and Rehabilitation, 3  Medical Biostatistics, and 4  Radiology, University of Vermont College of Medicine,…”
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A dynamic material parameter estimation procedure for soft tissue using a poroelastic finite element model by Laible, J P, Pflaster, D, Simon, B R, Krag, M H, Pope, M, Haugh, L D

“…A three-dimensional finite element model for a poroelastic medium has been coupled with a least squares parameter estimation method for the purpose of…”
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An internal fixator for posterior application to short segments of the thoracic, lumbar, or lumbosacral spine. Design and testing by Krag, M H, Beynnon, B D, Pope, M H, Frymoyer, J W, Haugh, L D, Weaver, D L

“…A new spinal implant has been designed and biomechanical testing completed, intended for application to "short-segment" spinal defects such as disc…”
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Placement of transpedicular vertebral screws close to anterior vertebral cortex. Description of methods by Krag, M H, Van Hal, M E, Beynnon, B D

“…Strengthening of the screw-vertebra interface has been shown to occur with implantation of longer transpedicular screws, the tips of which are placed closer to…”
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Clinical, radiographic, and kinematic results from an adjustable four-pad halovest by TOMONAGA, T, KRAG, M. H, NOVOTNY, J. E

“…Charts and radiographs of all patients treated with this halovest at one university hospital were reviewed retrospectively. To describe the outcomes from an…”
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Diagnosing instability by Pope, M H, Frymoyer, J W, Krag, M H

“…The various definitions of instability are reviewed and preference is given to the definition of instability as a loss of stiffness. This definition fits with…”
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Internal deformations of intact and denucleated human lumbar discs subjected to compression, flexion, and extension loads by Seroussi, R E, Krag, M H, Muller, D L, Pope, M H

“…Three rows of six evenly spaced 0.5 mm metal beads were implanted midsagittally into the discs of ten L4-5 human lumbar motion segments. The intradiscal bead…”
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Pull-off strength of gardner-Wells tongs from cadaveric crania by Krag, M H, Byrt, W, Pope, M

“…Failure of attachment ("pull-off") of Gardner-Wells tongs from the cranium occasionally occurs, and may cause problems, especially in cases of significant…”
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Repair of failed transpedicle screw fixation. A biomechanical study comparing polymethylmethacrylate, milled bone, and matchstick bone reconstruction by Pfeifer, B A, Krag, M H, Johnson, C

“…In a random, controlled laboratory study, pedicle screws placed in human cadaveric vertebrae were axially loaded to failure. Three repair methods were tested…”
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Effects of disc injury on mechanical behavior of the human spine by Panjabi, M M, Krag, M H, Chung, T Q

“…The effects of injury to the intervertebral disc were investigated using three-dimensional flexibility and creep measurements of functional spinal units from…”
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A new halo-vest: rationale, design and biomechanical comparison to standard halo-vest designs by Krag, M H, Beynnon, B D

“…The traditional halo-vest rigidly grips the cranium, but not the torso. Unexpectedly large motion and forces in the cervical spine have been shown by others to…”
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Vertebral osteomyelitis caused by Clostridium difficile. A case report and review of the literature by Incavo, S J, Muller, D L, Krag, M H, Gump, D

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