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dislocation after total hip arthroplasty. DDH had more complex to adjust cup and femoral neckanteversion during surgery. Purpose of this study was to evaluate neck-cup impingement withneck changeable Kinectiv stem for DDH patients.Materials & Methods;Single surgeon analyzed neck cup impingement during 148 primary total hip surgeries withDDH. 25 hips in men, surgical approach were 81 mini-one antero-lateral, 56 mini- Watson-Jones, and 11 Hardinge. Acetabular cups were seated 20 degrees anteversion. Stem was insertedmanually with standard technique. First trial was performed with straight type of neck and26mm femoral head based on preoperative templating. At neck and head trial to evaluatedantero-superior impingement with “flex+Add.+IR” and potero-inferior impingement with“ext.+add.+ER”. If the neck and cup impingement occurred even if no dislocation, necks werereplaced different version or larger offset.Results:Neck trial was 2 to 3 times during surgery (ave. 2.5). Version was changed 85 cases. Surgeonselected larger offset in 46, 35 longer length, 29 shorter length. Larger offset with longer lengthin 29, 9 had larger offsets and shorter length compared to 2D templating before surgery. Wehad no dislocations or revisions. Averaged hospital stay was 7 (4-12) days.Discussion:One Kiective stem had 60 variety of necks based on 4 mm head center difference. Largeamount of variation especially anteverted or retroverted neck selection might reduce neck-cupimpingement compared to other straight type of femoral stems. Proper offset and leg lenghth arealso very important issues for the patients. This type of stem had more advantages than straighttype monolithic stems to reduce wear and dislocation caused by impingement.Poster: 37Evaluation of Mechanical and Wear Properties of Low TemperatureDegradation Free Zirconia Toughened Alumina Ceramic for Artificial Joint*Junji Ikeda - Japan Medical Materials Corp. - Osaka, JapanTekefumi Nakanishi - Japan Medical Materials Corp. - Osaka, JapanFumiaki Miyaji - Japan Medical Materials Corp - Osaka, JapanYoshinori Sawae - Department of Mechanical Engineering, Faculty of Engineering, KyushuUniversity - Fukuoka, JapanTeruo Murakami - Kyushu University - Fukuoka, Japanfile:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]