Journal ArticleDOI
Assessment of pedicle screw pullout strength based on various screw designs and bone densities-an ex vivo biomechanical study.
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TLDR
Pedicle screw with an outer cylindrical and inner conical configuration with a V-shaped thread may have maximum pullout strength, regardless of bone density.About:
This article is published in The Spine Journal.The article was published on 2012-02-01. It has received 108 citations till now.read more
Citations
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Journal ArticleDOI
Designs and Techniques That Improve the Pullout Strength of Pedicle Screws in Osteoporotic Vertebrae: Current Status
Thomas M. Shea,Jake Laun,Sabrina A. Gonzalez-Blohm,James J. Doulgeris,William E. Lee,Kamran Aghayev,Frank D. Vrionis +6 more
TL;DR: The objective of this investigation is to provide an overview of the different pedicle screw designs and the associated surgical techniques either currently utilized or proposed to improve pullout strength in osteoporotic patients.
Journal ArticleDOI
Effect of various factors on pull out strength of pedicle screw in normal and osteoporotic cancellous bone models
TL;DR: The findings from the current study suggest that holding power of the pedicle screws can be increased by increasing the purchase depth and reducing the angle of insertion, and a statistical model was developed to predict the holdingPower of the screw which can assist surgeon in pre surgical planning.
Journal ArticleDOI
Surgical management of spinal conditions in the elderly osteoporotic spine
TL;DR: The purpose of this review is to familiarize the reader with the impact of osteoporosis on spinal instrumentation, the broad variety of techniques that have been developed for addressing these issues, and the biomechanical and clinical evidence in support of the use of these techniques.
Journal ArticleDOI
A novel auxetic structure based bone screw design: Tensile mechanical characterization and pullout fixation strength evaluation
TL;DR: In this paper, the auxetic unit cells (A1-A6) were introduced into the design of screw bodies after a mechanical evaluation, and the novel auxetic structure based bone screws were designed and mechanical properties and fixation strength were evaluated.
Journal ArticleDOI
Rotary ultrasonic bone drilling: Improved pullout strength and reduced damage.
TL;DR: A significant decrease in the number and dimensions of microcracks generated on the inner surface of drilled holes with the RUBD process in comparison to CSBD, and it was observed that a higher rotational speed and a lower feed rate resulted in lower damage, i.e. fewer microcrack.
References
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Journal ArticleDOI
A biomechanical study of intrapeduncular screw fixation in the lumbosacral spine.
TL;DR: Methyl methacrylate was found to restore secure fixation in previously-loosened screws and pressurization of cement doubled the pull-out force in cyclic load tests, deeper-inserted screws were found to withstand a greater number of cycles before loosening.
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New universal instrumentation in spinal surgery.
TL;DR: A new instrumentation for posterior spinal surgery consists of metallic rods carved with diamond-shaped asperities on which vertebral hooks or screws can be screwed in any position, level, or degree of rotation, which allows mobilization of the vertebrae located at the apex of the curve and obtains a three-dimensional correction.
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Effects of bone mineral density on pedicle screw fixation.
TL;DR: Pedicle screw pullout strength was highly correlated with bone mineral density, and use of pedicle screws in conjunction with laminar hooks at two levels improved pull out strength.
Journal ArticleDOI
Complications associated with pedicle screws.
John E. Lonstein,Francis Denis,Joseph H. Perra,Manuel R. Pinto,Michael D. Smith,Robert B. Winter +5 more
TL;DR: There are few problems associated with the insertion of screws, provided that the surgeon is experienced and adheres to the principles and details of the operative technique, and a low rate of postoperative complications related to pedicle screws.
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A method of spinal fusion
TL;DR: A relatively simple method of spinal fusion with internal splinting by screw fixation with lively and healthy interest shown in the factor which has allowed early activity is described.