Convened under the auspicious of esteemed endorsers - ISTA

The presentattion will focus on technical tips that make OrthoPilot Navigated Total kneereplacement easier and faster. Navigation while providing accuracy and soft tissue balancing,does add time to the procedure and there is a learning curve to Navigation, The presentationwill highlight steps where time is wasted and what can be done to speed up the procedure.Sources of error and steps to minimze errors will also be discussed. This will be presentationemphasizing techical tips and no research findings or data will be presented.Thursday, October 7, 2010, 11:10-11:50Session A4: Hip ResurfacingEffectiveness of Patient Matched Hip Resurfacing Femoral AlignmentGuideIntroduction*Abraham Salehi - Smith & Nephew, Inc. - Memphis, USAAshley Snider - Smith and Nephew Orthopaedics, Inc. - Memphis, USADavid Mehl - Smith and Nephew Orthopaedics, Inc. - Memphis, USA*Email: Abraham.Salehi@smith-nephew.comHip resurfacing is a bone sparing approach to treating arthritis in younger or more activepatients. Accurate positioning of the femoral component in the hip resurfacing procedure isessential for the success of the operation [1-2]. An alignment guide assisting the operator inaccurately positioning the resurfacing implant may increases the success rate of the operation.This study focuses on the effectiveness of a CT based resurfacing alignment guide, shown inFigure 1.Materials and MethodsFour full fresh frozen human cadaveric specimens were CT scanned to reconstruct bonemodels of the femoral head/neck geometries with no cartilage included in the segmentation.Femoral head resurfacing alignment guides were then created through computer aided design(CAD) modeling using landmarks from the reconstructed bone models for proper seating. Atotal of 12 resurfacing alignment guides (3 for each specimen) were prepared.After the exposure of the hip joints, the first two out of three resurfacing alignment guides wereused to asses the fit, stability, and visual assessment of valgus and version alignments. Thethird resurfacing alignment guide for each specimen was placed on the femoral head/neck regionand the guide wire was drilled into the femur. A fluoroscopy image was taken to assess andmeasure the valgus and version alignment. The acceptance criteria for valgus alignment, asshown in Figure 2, is set to be ±2.5° from a line parallel to the medial calcar of the femoralneck, Similarly, the acceptance criteria for the version alignment was set to be ±2.5° from a linepassing through the neutral axis of the femoral neck.file:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]