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Biomechanical Evaluation of the Less Invasive Stabilization System and the 95-degree Angled Blade Plate for the Internal Fixation of Distal Femur Fractures in Human Cadaveric Bones with High Bone Mineral Density

2006; Lippincott Williams & Wilkins; Volume: 60; Issue: 4 Linguagem: Inglês

10.1097/01.ta.0000208129.10022.f8

1529-8809

Michael Zlowodzki, S Williamson, Lyle D. Zardiackas, Philip J. Kregor,

Hip and Femur Fractures

Background: The less invasive stabilization system (LISS) is an internal fixator that utilizes unicortical locked screws for fixation of distal femur fractures. A question is whether locked unicortical screw fixation is sufficient, when compared with a standard implant such as a blade plate. Methods: Eight matched pairs of fresh-frozen cadaveric femora were instrumented with either the LISS or a 95-degree blade plate. A 4-cm supracondylar gap fracture model was created and all bone-implant constructs were tested to failure in axial loading. Results: All constructs failed by plastic deformation of the implant. There was no significant difference between the LISS and the blade plate constructs with respect to load to failure. Conclusions: Despite unicortical fixation axial loading to failure of the LISS did not result in implant/screw pull-out neither proximally nor distally. However, there does not appear to be a biomechanical advantage of using the LISS as opposed to a blade plate in bones with high bone mineral density.