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Results: The accuracy (mean of the absolute difference between intra-operative target angleand post-operative CT angle) of anteversion angle was 4.0 ± 4.7 degrees in navigated group,and 12.5 ± 8.2 degrees in conventional group. The accuracy of the inclination angle was 3.1 ±3.5 degrees in navigated group, and 5.4 ± 3.4 degrees in conventional group. When we focus onthe recent 30 cases in the navigated group, the accuracy of anteversion and inclination anglewas 2.5 ± 2.1 degrees and 1.7 ± 1.4 degrees respectively. There was no postoperative dislocationin both groups.Conclusions: Our study clearly showed that CT based navigation system improved accuracy ofthe cup placement in cementless THA, especially for the anteversion angle. On the contrary,unexpected poor accuracy of the conventional technique was revealed. Although there are somedisadvantages such as initial investment, additional operation time for the placement of trackersand surface registration, and learning curve, the CT based navigation system has greatadvantage to minimize the complication due to improper placement of the cup and maximizethe longevity of total hip arthroplasty.Poster: 22Dysplastic Hip*Ashraf Elwakeel - ? - ?, ?*Email: mta.2006@yahoo.comDysplastic hip means abnormality during development resulting in abnormality of depth,orientation and/or configuration, it is usually associated with proximal femoral abnormality andthere is statistical association between an abnormal center edge angle and the incidence of hiposteoarthritis.50 cases of dysplastic hip were done by different techniques with the aim to regain theanatomical hip center with reasonable coverage and well fixed cups.All the cases are evaluated according to Crowe classification with new technique for hipreplacement in D.D.H by iliofemoral distraction and new evaluation in hip replacementfollowing fracture neck femur.file:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]