Pedicle Screw Designs in Spinal Surgery: Is There a Difference? A Biomechanical Study on Primary and Revision Pull-Out Strength

Spine
Wei Ren Daniel SengJacob Y L Oh

Abstract

An experimental laboratory-based biomechanical study. The objective of this study was to evaluate, in a synthetic bone model, the difference in primary and revision pull-out strength using pedicle screws of different thread designs. Over the past few decades, there has been a growing interest in optimizing the screw pull-out strength using various screw designs (single-thread, mixed-thread, dual-thread). Although primary pull-out strength has been studied previously, little is known about revision pull-out strength of different pedicle screws. The pull-out strengths of three different pedicle screw designs (single-thread, mixed-thread, dual-thread) were tested in standardized polyurethane foam in three sequences. Sequence 1: A 6.5 mm screw was inserted into the foam block and the primary pull-out strength measured. Sequence 2: A 6.5 mm screw was inserted, removed, and then reinserted into the same foam block. The revision pull-out strength was then measured. Sequence 3: A 6.5 mm screw was inserted, removed and a 7.5-mm screw of the same thread design was reinserted. The revision pull-out strength was then measured. The primary pull-out strength was similar across screw designs, although dual-thread screws showed higher primary ...Continue Reading

References

Aug 1, 1996·Journal of Biomechanical Engineering·J R ChapmanD Kowalski
Jul 2, 2008·Journal of Neurosurgery. Spine·Michael Hannes KrennPeter Augat
Feb 18, 2012·The Spine Journal : Official Journal of the North American Spine Society·Young-Yul KimKee-Won Rhyu

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Citations

Jan 15, 2021·Biomedical Physics & Engineering Express·Pushpdant JainMohammed Rajik Khan
Jul 19, 2021·The Spine Journal : Official Journal of the North American Spine Society·Ryan WeegensSteven D Glassman

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