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Conclusion: the longivity of hip arthroplasty is an important factor in gauging the success ofan implant. Increasing the femoral offset should result in a reduction in joint reaction force.This should decrease the polyethylene wear. It can be concluded that this stem is now able tosatisfy the aim of reconstructing the normal anatomy of the hip joint and therefore improvejoint biomechanics.Poster: 69Patient-Specific Mechanical Navigation of Acetabular ComponentOrientation Based on Conventional RadiographyWilliam S Murphy - new england baptist hospital - boston, usaSimon D Steppacher - inselspital - bern, switzerlandJens H Kowal - inselspital - bern, switzerland*Stephen Murphy - New England Baptist Hospital - Boston, USA*Email: stephenbmurphymd@gmail.comPATIENT-SPECIFIC MECHANICAL NAVIGATION OF ACETABULARCOMPONENT ORIENTATION BASED ON CONVENTIONAL RADIOGRAPHYWilliam S. Murphy 1 , Simon D. Steppacher MD 2 , Jens H. Kowal PhD 2 , Stephen B. MurphyMD 11 Center for Computer Assisted and Reconstructive Surgery, New England Baptist Hospital,Boston, University of Bern, Bern Switzerland 2Introduction: Acetabular component malposition is associated with wear- induced looseningand instability, the two most common reasons for revision THA. A novel mechanical navigationinstrument, adjusted uniquely for each patient, has already been shown to produce acceptablecup position in 70 of 70 hips when planned using preoperative CT surface modeling. Thecurrent study compares the accuracy of adjusting the instrument with information derived fromstatistical models based on individual patient AP and lateral radiographs to 3D models from CTimaging.file:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]