Cannulated screw with solid core insert: stronger than cannulated screws

We conducted a study to determine if there is a significant difference in ultimate load, yield strength, and fatigue strength between solid core screws and cannulated screws and if a solid core insert placed inside a cannulated screw would have biomechanical effects similar to those of a solid core...

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Bibliographic Details
Published inThe American journal of orthopedics (Belle Mead, N.J.) Vol. 43; no. 9; p. E191
Main Authors Dundon, John M, Gould, Gregory C, Herbenick, Michael A, Hamilton, J Adam
Format Journal Article
LanguageEnglish
Published United States 01.09.2014
Subjects
Biomechanical Phenomena
Bone Screws
Fracture Fixation - instrumentation
Humans
Materials Testing
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Summary:We conducted a study to determine if there is a significant difference in ultimate load, yield strength, and fatigue strength between solid core screws and cannulated screws and if a solid core insert placed inside a cannulated screw would have biomechanical effects similar to those of a solid core screw. Five screw designs were tested: Synthes 4.5-mm solid core and 4.5-mm cannulated and our prototype 4.0-mm solid core, 4.0-mm cannulated, and 4.0-mm cannulated with solid core insert. Biomechanical testing with 3-point bending was used to determine ultimate load, yield strength, and cycles to failure for 6 screws of each design. Ultimate load, yield strength, and cycles to failure were significantly (P < .05) lower in the Synthes 4.5-mm cannulated screws than in the Synthes solid core screws and significantly lower in the prototype cannulated screws than in the prototype solid core screws (P < .05) and prototype cannulated screws with solid core inserts (P < .05). There was no significant difference (P > .05) in ultimate load, yield strength, or cycles to failure between the prototype cannulated screws with solid core inserts and the prototype solid core screws.
ISSN:1934-3418