Insertion torque and pullout force of rescue screws for anterior cervical plate fixation in a fatigued initial pilot hole

Journal of Neurosurgery. Spine
T R PitzenWolf-Ingo Steudel

Abstract

The purpose of this study was to investigate whether thicker-core-diameter screws increase fixation strength in the cervical spine. Bone mineral density (BMD) was determined for each vertebral body (VB) obtained in six human C4-7 segments. Based on their BMD, the specimens were assigned to one of two groups in which torque and pullout force were tested. Two initial pilot holes were drilled into the VBs and tests were first performed using a standard screw. The test was repeated using a thicker rescue screw inserted into the same initial pilot hole. The mean value of peak torque and pullout force resulting from the single left/right measurements was used for statistical analysis. A t-test was performed to determine the effect of screw design on peak torque and pullout force. Moment correlation coefficients were calculated to determine the effect of BMD on peak torque and pullout force. Mean insertional peak torque for the standard screw was 82.1 N/cm and that for the rescue screw was 47.6 Ncm (p < 0.001). There was a strong correlation between insertional peak torque and BMD for both standard screws (r = 0.71, p = 0.02) and rescue screws (r = 0.59, p = 0.07). The mean pullout force for standard screws was 464.7 N, whereas it was...Continue Reading

References

Jun 18, 1998·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·B JostL P Nolte
Feb 24, 2001·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·P I WuismanB J Van Royen
May 7, 2002·Journal of Neurosurgery·John S SarzierDavid W Cahill
Oct 18, 2002·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·T PitzenM Strowitzki
Dec 4, 2002·Clinical Orthopaedics and Related Research·William J MaloneyWilliam H Harris

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Citations

Dec 11, 2007·Osteoporosis International : a Journal Established As Result of Cooperation Between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA·J GoldhahnB Hanson
Feb 3, 2007·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·Konrad SellerBerend Linke
Jan 24, 2007·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·Tobias PitzenHans Joachim Wilke
Mar 2, 2006·Journal of Neurosurgery. Spine·Tobias Rainer PitzenWolf-Ingo Steudel
Apr 23, 2013·The Spine Journal : Official Journal of the North American Spine Society·Leonardo B C BrasilienseNeil R Crawford
Aug 4, 2015·The Spine Journal : Official Journal of the North American Spine Society·Srinidhi NagarajaMelvin D Helgeson
May 2, 2015·Journal of Korean Neurosurgical Society·Suk-Hyung KangSeung Won Park
Apr 9, 2010·Yonsei Medical Journal·Moon Young JungSang Sup Chung
Jun 25, 2016·Injury·Christian von Rüden, Peter Augat
Jan 22, 2017·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·Sebastian HartmannWerner Schmölz
Jul 18, 2012·Clinical Spine Surgery : a Spine Publication·Murat YilmazNeil R Crawford

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pullout

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