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average absolute difference between navigation and measured angles were 5.2 ± 4.0 degree ininclination, 5.9 ± 4.0 degree in anteversion. The difference of cup height was 5.8 ± 3.9 mm, cupmedialization was 3.8 ± 2.7 mm, leg elongation was 4.3±3.3mm, and offset was 5.4±4.1mm,respectively.By using this new version navigation system, we can plan the cup center position and navigateit within smaller error of vertical and horizontal direction than the previous system. Moreover,leg elongation and offset change can be satisfactory navigated during operation. Howeversurgeon’s skill and learning curve might have influence the accuracy. We have to continue toevaluate this system and make effort to further improvement.Thursday, October 7, 2010, 10:20-11:00Session A3: Bearing Mobility IssuesA Patient Specific Template Technique Improved Femoral ComponentAlignment in Hip Resurfacing*Hiroyoshi Iwaki - Osaka City University Medical School - osaka, japanTaku Yoshida - Osaka City University Graduate School of Medicine - Osaka-City, JapanMitsuhiko Ikebuchi - Osaka City University Medical School - osaka, japanYukihide Minoda - Osaka - Osaka, JapanTakahiro Iida - Osaka City Univ. Medical School - Osaka City, JapanTessyu Ikawa - Osaka City University Medical School - osaka, japanHiroaki Nakamura - Osaka City University Medical School - osaka, japan(Introduction)*Email: h-iwaki@med.osaka-cu.ac.jpThere is many reports about complications with a resurfacing total hip arthroplasty (RHA). Oneof the most common complications is the femoral neck fracture. A notch and malalignmentwere risk factors for this. For an accurate implanting the femoral component in RHA,we performed 3D template and made a patient specific template (PST) using 3D printer andapplied this technique for a clinical usage. We report a preliminary early result using this noveltechnique.(material and method)We performed 10 RHAs in nine patients (7 male, 2 female) from June 2009 to March 2010 dueto osteonecrosis in 7 hips and secondary osteoarthritis in 3hips with a mean age of 48 years (40-60). We obtained a volumetric data from pre-operative CT and planned using 3D CADsoftware. Firstly, size of femoral components were decided from the size planning of cups.We aimed a femoral component angle as ten degrees valgus to the neck axis in AP and parallelin lateral view avoiding a notch. We measured femoral shaft axis and femoral neck axis in APand lateral view using 3D processing software. PSTs were made using Laser Sintering by 3Dprinter which had the heat tolerance for sterilization in order to insert the femoral guide wirecorrectly. We operated in postero-lateral approach for all the patients PST has the base (contactpart) fit to poterior inter trochanteric area. It has the arm reached from the base and sleeve holefile:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]