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acetabular anterior roof and (3) whether affected side femoral artery would fork moreproximally to profunda artery than unaffected side artery, in the case of congenital high hipdislocation.[Patients and Methods]We retrospectively reviewed 18 patients / 23 hips of congenital high hip dislocation, one male /17 female, mean 65.1 ± 8.8 years old (54-83), eight Crowe Type III hips / 15 Type IV hips.There were no Crowe Type I and II hips. In the unilateral patients, unaffected side hip wasdefined as normal hip. Radio graphical examination was performed using CT scan image. Weclassified a run of femoral artery as far group if the distance between femoral artery andacetabular anterior roof was more than 1cm and as near group if the distance was less than 1cm.We examined the location of the fork of femoral artery to profunda.[Results]Near groups were 17 hips in the 23 hips of congenital high hip dislocation (73.9%) and 4 hipsin the 12 normal hips (33.3%). Near groups could be seen significantly frequent in the cases ofcongenital high hip dislocation than in the normal hips. The distance between femoral arteryand acetabular anterior roof was significantly shorter in the case of congenital high hipdislocation. Twenty iliopsoas muscles could not be seen in the 23 cases of congenital high hipdislocation and all iliopsoas muscles could be seen in the 12 normal hips between femoralartery and acetabular anterior roof. Nine femoral arteries forked to the profunda artery at thelevel of original acetabulum in the 23 cases of congenital high hip dislocation (39.1%). Threefemoral arteries forked at the level of original acetabulum in the 12 normal hips (25.0%).[Summary]We evaluated anatomical analysis of femoral artery in the case of congenital high hipdislocation using CT scan. The femoral artery of affected side had run closely from acetabularanterior roof in the case of congenital high hip dislocation. We should pay attention to the runof artery surrounding hip.Poster: 115Evaluation of New Developmental Navigation System for Total KneeArthroplasty(Purpose)Yusuke Yokoyama - Okayama University Hospital - Okayama, Japan*Nobuhiro Abe - Okayama University Hosptal - Okayama, JapanToshifumi Ozaki - Okayama University Hospital - Okayama, Japan*Email: nobuabe@md.okayama-u.ac.jpThe navigation system was reported to improve the accuracy of bone resection for total kneefile:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]