• William C H Parr, Tian Wang, Christopher Tan, Michael J Dan, William R Walsh, and Per Morberg.
• Surgical and Orthopaedic Research Laboratories (SORL), School of Clinical Sciences, Faculty of Medicine, UNSW Sydney, Level 1 Clinical Sciences Building, Prince of Wales Hospital, Gate 6 Avoca Street, Randwick, New South Wales (NSW), 2031, Australia.
• Injury. 2021 Oct 1; 52 (10): 2896-2902.

Objectives- We aimed to investigate how pre-bending affects the mechanical properties, specifically fatigue, of stainless-steel plates.Methods- 3.5mm LCP 10-hole plates were pre-bent in 1, 2 and 3 locations to the same overall degree and fatigue testing performed. Finite Element Analysis (FEA) was performed in Strand7 (version 2.4.6) to better understand the failure point of the plates in four-point bending.Results- Six different plate pre-bending conditions were tested for resistance to fatigue failure. Increasing the number of pre-bends improved the fatigue resistance with two pre-bends having a mean 509,304 cycles to failure and three pre-bends 491,378 cycles to failure. The region of highest stress and the point of fatigue failure were at the plate's minimum cross-sectional area, which was predicted by the FEA and confirmed with mechanical testing. For plates pre-bent in two locations, the fatigue failure always occurred in the screw hole not in between the positions of the two pre-bends. Non-linear FEA simulation confirmed that work hardening occurs around pre-bend locations, conferring increased fatigue resistance to the holes next to, or between, pre-bend locations.ConclusionsWe found that contrary to orthopaedic folklore, pre-bending of plates is not detrimental to fatigue resistance of the stainless-steel plates we tested. Pre-bending plates in a single plane increased the fatigue properties of the 10-hole stainless-steel plate tested.Copyright © 2021. Published by Elsevier Ltd.

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