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Special Section Technical Briefs

Spinal Pedicle Screw Design Retains Grip Strength After Loosening and Relocking1

[+] Author and Article Information
David J. Nuckley, Krishna C. Vedula, Hugh Hestad, John Dawson

Research and Development,
Zimmer Spine,
Minneapolis, MN 55439

Accepted and presented at The Design of Medical Devices Conference (DMD2015), April 13–16, 2015, Minneapolis, MN, USA.

Manuscript received March 3, 2015; final manuscript received March 17, 2015; published online July 16, 2015. Editor: Arthur Erdman.

J. Med. Devices 9(3), 030901 (Sep 01, 2015) (2 pages) Paper No: MED-15-1056; doi: 10.1115/1.4030542 History: Received March 03, 2015; Revised March 17, 2015; Online July 16, 2015

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Figures

Grahic Jump Location
Fig. 1

Experimental evaluation of pedicle screw–rod interface via ASTM F1798-13 axial (a), torsional (b), and flexion/extension (c) grip strength testing

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Fig. 2

Experimental results of axial grip testing. Notice that design B increases in axial grip, while design A decreases after one cycle of tightening, loosening, and tightening.

Grahic Jump Location
Fig. 3

Experimental results of torsional grip testing. Design A experiences a marked decrease in torsional grip strength, while design B increases in grip strength.

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