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Multiaxial pedicle screw designs: static and dynamic mechanical testing.

Authors
  • Stanford, Ralph Edward
  • Loefler, Andreas Herman
  • Stanford, Philip Mark
  • Walsh, William R
Type
Published Article
Journal
Spine
Publisher
Ovid Technologies (Wolters Kluwer) - Lippincott Williams & Wilkins
Publication Date
Feb 15, 2004
Volume
29
Issue
4
Pages
367–375
Identifiers
PMID: 15094532
Source
Medline
License
Unknown

Abstract

Bending yield strengths just exceeded loads expected in vivo. Multiaxial designs had lower static bending yield strength than fixed screw designs. Five out of six multiaxial screw designs achieved one million cycles at 200 N in compression bending. "Ball-in-cup" multiaxial locking mechanisms were vulnerable to fatigue failure. Smooth surfaces and thicker material appeared to be protective against fatigue failure.

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