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In vitro evaluation of bone plate strain following fracture repair using different screw configurations

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Title: In vitro evaluation of bone plate strain following fracture repair using different screw configurations
Author: Wainberg, Shannon
Department: Department of Clinical Studies
Program: Clinical Studies
Advisor: Moens, Noel
Abstract: This study investigated a comprehensive examination of plate strain under realistic fracture configurations. The effect of plate working length, plate contact, fracture length and position on strain was evaluated using bone surrogates subjected to “load controlled”, non-destructive conditions. We hypothesized that under load-controlled conditions, plates with a long working length would experience greater or equal strain as plates with short working length. Five 3.5mm LCP™ plates were instrumented with 6 strain gauges and nine fracture models were created using bone surrogate, each representing a combination of the criteria under study: long vs. short working length, degree of plate compression, fracture location and fracture length. The constructs were cyclically loaded at a rate of 5mm/min to 50N, 100N and 200N and strain was recorded at each of the calibrated gauges. In all symmetrical models, strain was noted to be highest over the fracture gap. Increasing the plate working length increased strain at higher loads and increased strain on the plate adjacent to the fracture gap. A shorter fracture gap with a long working length only had a negligible protective effect at higher loads as the surrogate contacted the plate during bending. Elevating the plate from the bone increased strain in all configurations. Fracture location had minimal effect on plate strain. Overall, a shorter working length reduced strain on the plate over the span of the plate.
Date: 2021-05
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