Moments and forces during pedicle screw insertion. In vitro and in vivo measurements

Spine
D W BühlerL P Nolte

Abstract

Moments and forces during pedicle screw insertion were measured in vivo and in vitro and were correlated to several parameters of the screw-bone interface. To compare the in vitro and in vivo screw insertion loads and to relate these measurements to bone mineral density, pedicle size, and other screw parameters (material, diameter). The in vitro screw insertion torque has been correlated to the screw pullout forces and the number of cycles to ultimate interface failure. However, there are no comparable in vivo data. One hundred three pedicle screws were included in the study, 43 in vivo and 60 in vitro. Duel-energy x-ray absorptiometry boen mineral density data were available for 20 in vivo and 32 in vitro specimens. A custom-made sterilizable six-axis load cell was integrated into a torque wrench, enabling the recording of the applied moments and forces during screw insertion. Statistical analysis was performed to detect differences and correlations. The mean in vivo insertion torque (1.29 Nm) was significantly greater than the in vitro value (0.67 Nm). The linear correlation between insertion torque and bone mineral density was significant for the in vitro data but not for the in vivo data. No correlation was observed between...Continue Reading

References

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Citations

Apr 9, 2005·Journal of Orthopaedic Science : Official Journal of the Japanese Orthopaedic Association·Koichi MizunoKazuyuki Otani
May 1, 2011·Geriatric Orthopaedic Surgery & Rehabilitation·A Feroz DinahStephen M Belkoff
Jun 5, 2003·Clinical Orthopaedics and Related Research·Panayiotis J PapagelopoulosKai-Nan An
Apr 21, 2007·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Qi LiuRobert A Hart
Sep 22, 2009·Journal of Prosthodontics : Official Journal of the American College of Prosthodontists·Michael S McCrackenMahendra D Mavalli
Aug 14, 2018·Clinical Spine Surgery : a Spine Publication·Koji IshikawaKatsunori Inagaki
Dec 5, 2018·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·Marco BurkhardMazda Farshad
Aug 29, 2014·Journal of Orthopaedic Surgery·Chun Ee TanKenneth Man Chee Cheung
Jul 27, 2017·Clinical Spine Surgery : a Spine Publication·Keitaro MatsukawaKoichi Nemoto
Oct 3, 2002·Foot & Ankle International·Catherine G AmbroseW Hodges Davis
Aug 7, 2019·Clinical Biomechanics·James W A FletcherEzio Preatoni

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