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  • Title: Intraprosthetic screw fixation increases primary fixation stability in periprosthetic fractures of the femur - a biomechanical study.
    Author: Brand S, Klotz J, Hassel T, Petri M, Ettinger M, Bach FW, Krettek C, Gösling T.
    Journal: Med Eng Phys; 2014 Feb; 36(2):239-43. PubMed ID: 23993993.
    Abstract:
    BACKGROUND: The purpose of this study was to develop a new fixation technique for the treatment of periprosthetic fractures using intraprosthetic screw fixation. The goal was to biomechanically evaluate the increase in primary fixation stability compared to unicortical locked-screw plating. METHODS: A Vancouver C periprosthetic fracture was simulated in femur prosthesis constructs. Fixation was then performed with either unicortical locked-screw plating using the LISS-plate or with intraprosthetic screw fixation. Fixation stability was compared in an axial load-to-failure model. RESULTS: The intraprosthetic fixation model was superior to the unicortical locked-screw fixation in all tested devices. The intraprosthetic fixation model required 11,807N±1596N for failure and the unicortical locked-screw plating required 7649N±653N (p=0.002). CONCLUSION: Intraprosthetic screw anchorage with a special prosthesis drill enhances the primary stability in treating periprosthetic fractures by internal fixation.
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