Does the direction of pedicle screw rotation affect the biomechanics of direct transverse plane vertebral derotation?

Spine
Stefan ParentPeter O Newton

Abstract

In vitro biomechanical investigation using human cadaveric vertebrae. Evaluate the biomechanical differences in transverse plane vertebral body derotation maneuvers of thoracic pedicle screws in both medial and lateral directions. Thoracic pedicle screws are thought to have better vertebral rotation control and better segmental scoliosis correction compared to hooks and wires. Little data exists regarding the biomechanical stability of pedicle screws when derotated in either medial or lateral directions. Vertebral bodies (T4-L5) from 12 cadavers were instrumented with appropriate length pedicle screws while measuring insertion torque. Each body was anchored for independent loading in medial or lateral directions. Each screw was rotated around a rod using a constant length lever arm (30.5 cm) rigidly attached to the screw head simulating the posterior vertebral derotation maneuver. Yield torques (Nm) were analyzed using a one-way analysis of variance (P < 0.05). Yield torques for both directions were significantly related to screw insertion torque (both P < 0.01). There were no statistical differences in yield torque between medial (12.0 +/- 4.9 Nm) or lateral (11.5 +/- 5.1 Nm) directions. There were no significant differences a...Continue Reading

References

Jun 1, 1991·Spine·R H WittenbergW C Hayes
Jan 1, 1990·Journal of Orthopaedic Trauma·T A DeCosterW Jones
Aug 1, 1994·Spine·A G BrantleyK R Clark
Jul 9, 1998·Spine·D W PollyR G Ellenbogen
Nov 1, 2000·The Journal of Bone and Joint Surgery. American Volume·R W Gaines
May 25, 2006·Spine·Serkan InceoğluRobert F McLain

❮ Previous
Next ❯

Citations

Jun 16, 2009·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Ahmet Yilmaz SarlakLevent Buluç
Jun 8, 2014·Clinical Biomechanics·Frederique Desrochers-PerraultRichard M Schwend
Oct 15, 2011·The Spine Journal : Official Journal of the North American Spine Society·Elena MontesCarlos Correa
Dec 10, 2014·The Spine Journal : Official Journal of the North American Spine Society·Siddharth A BadveWilliam F Lavelle
Nov 17, 2015·Spine·Rohan-Jean BiancoPierre-Jean Arnoux
May 14, 2019·Asian Spine Journal·Tevfik BalikciMurat Bezer
Apr 25, 2017·Clinical Spine Surgery : a Spine Publication·Xiaoyu WangJeremy Rawlinson
Dec 9, 2016·Spine Deformity·Sean L BorkowskiEdward Ebramzadeh
May 20, 2019·Irish Journal of Medical Science·Iain FeeleyConnor Green

❮ Previous
Next ❯

Related Concepts

Related Feeds

Biomechanics

Biomechanics examines the generation of internal forces within the body and investigates the effects and control of forces that act on or are produced on tissues. Here are the latest discoveries.