Journal article
Biomechanical comparison of single- and dual-lead pedicle screws in cadaveric spine: Laboratory investigation
Journal of neurosurgery. Spine, Vol.8(1), pp.52-57
01/2008
DOI: 10.3171/SPI-08/01/052
PMID: 18173347
Abstract
Object
The pedicle screw (PS) is the cornerstone of spinal instrumentation, and its failure often entails additional surgery. Screw pullout is one of the most common reasons for screw failure, particularly in the elderly population. In this study the authors undertook a biomechanical comparison of the maximum pullout force (MPF) required for single- and dual-lead PSs in cadaver vertebrae.
Methods
Radiographs of 40 cadaveric vertebrae (T11–L5) were obtained, and bone mineral density (BMD) was measured in the lateral plane using dual–x-ray absorptiometry with a bone densitometer. One screw of each design was implanted for side-by-side comparison. Vertebrae were potted and mounted on an MTS test frame for accurate measurement of MPF. A total of 80 PSs were tested, 40 each of single- and dual-lead design types.
Results
The average MPF for dual-lead screws (533.89 ± 285.7 N) was comparable to that of single-lead screws (524.90 ± 311.6 N) (p = 0.3733). The BMD had a significant correlation with MPF for both dual-lead (r = 0.56413, p < 0.0001) and single-lead screws (r = 0.56327, p < 0.0001).
Conclusions
Barring the effect of BMD, this in vitro biomechanical test showed no significant difference in MPF between single- and dual-lead PSs. Dual-lead PSs can be used to achieve a faster insertion time, without compromising pullout force.
Details
- Title: Subtitle
- Biomechanical comparison of single- and dual-lead pedicle screws in cadaveric spine: Laboratory investigation
- Creators
- Arun T Jacob - 1Departments of NeurosurgeryAditya V Ingalhalikar - 2Biomedical Engineering, andJohn H Morgan - 2Biomedical Engineering, andScott Channon - 2Biomedical Engineering, andTae-Hong Lim - 2Biomedical Engineering, andJames C Torner - 3Epidemiology, University of Iowa and Carver College of Medicine, Veterans Administration and Medical Center Iowa City, IowaPatrick W Hitchon - 1Departments of Neurosurgery
- Resource Type
- Journal article
- Publication Details
- Journal of neurosurgery. Spine, Vol.8(1), pp.52-57
- DOI
- 10.3171/SPI-08/01/052
- PMID
- 18173347
- NLM abbreviation
- J Neurosurg Spine
- ISSN
- 1547-5654
- eISSN
- 1547-5646
- Publisher
- American Association of Neurological Surgeons
- Language
- English
- Date published
- 01/2008
- Academic Unit
- Roy J. Carver Department of Biomedical Engineering; Epidemiology; Surgery; Injury Prevention Research Center; Neurosurgery
- Record Identifier
- 9983995050202771
Metrics
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