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*Email: haciba.khelifi@luc-voyages.comIntroductionRoutine radiological study of THA patients is based on standing AP radiographs. The EOS®system provides simultaneous AP and lateral with low dose high definition images. For the firsttime the authors report data on standing and sitting positions in THA patientsMaterial and methods200 asymptomatic THA patients were enrolled in the study. Two independent observersperformed the measurements in standing and sitting positions (frontal and sagittal cupinclinations , incidence angle , pelvic tilt angle, sacral slope angle, Lewinnek angle, cupanteversion according to Pradhan method). The axial torsion of the pelvis was assessed with adedicated software.ResultsIntra and inter-oberver reproducibility was excellent for the different parameters . Newinformations could be obtained about the sitting position. Anterior pelvic plane or Lewinnekangle was 0° in standing position (SD: 7,6°) but 23,5° sitting ( SD: 9,9°) . Sacral slope standingwas 40,9° (SD:9,3°) and 19,9° sitting (SD: 11,2°) . Variations of cup inclination andanteversion could be clearly correlated to the pelvic tilt changes.6% of the patients were sitting in a femoral posterior version despite a standard femoralanteversion standing.31% of the patients demonstrated a reproducible axial torsion of the pelvisin standing position or in sitting position .ConclusionThe EOS® system allows the global assessment of functionnal anatomy of the pelvic area,providing new data on the cup-stem relationships .Such informations can be useful in case ofrecurrent dislocations or abnormal wear .Poster: 54Anatomic Gender Difference of Patellar Morphology in Total KneeArthroplasty; an Aid in Patellar Component Designfile:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]