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Yoshiaki Miyake - Okayama University - Okayama, JapanToshifumi Ozaki - Okayama University Hospital - Okayama, JapanShigeru Mitani - Kawasaki Medical School - Kurashiki-city, Japan*Email: fujiwara@md.okayama-u.ac.jp(Objectives) Few reports were shown about the position of the cup in total hip arthroplasty(THA) with CT-based navigation system. We use minimally invasive surgery (MIS) techniquewhen we perform cementless THA and the correct settings of cups are sometimes difficult inMIS. So we use CT-based navigation system for put implants with correct angles and positions.We evaluated the depth of cup which was shown on intra-operative navigation system.(Materials and Methods) We treated 30 hips in 29 patients (1 male and 28 females) bynavigated THA. 21 osteoarthritis hips, 6 rheumatoid arthritis hips and 3 idiopathic osteonecrosiships were performed THA with VectorVision Hip 2.5.1 navigation system (BrainLAB).Implants were AMS HA cups and PerFix stems (Japan Medical Materials, Osaka). Appropriateangles and positions of cups were decided on the 3D model of pelvis before operation.According to the preoperative planning, we put the implants with navigation system. We correctthe pelvic inclination angle and measured the depth of cups with 3D template software.(Results) The average distance from the surface of the cup to the edge of medial wall of pelviswas 3.4mm (0.0-8.0mm) on the axial plane which include the center of femoral head onpostoperative CT. The average distance from the surface of the cup to the edge of medial wallof pelvis was 6.4mm (1.5-15.0mm) on intraoperative navigation. The average error was 2.9mm(0.0-9.0mm). The cup positions of post operative CT were deeper than that of intraoperativenavigation in twenty six hips (86%).(Conclusions) The shallow setting of cups caused the instability of cups. Deep setting causeddamage of acetabular fossa. The positions of cups on the navigation system tend to be shownshallower than actual positions, so we should take care of deeper setting.Friday, October 8, 2010, 16:30-17:30Session B15: MIS Techniques in TKASubvastus Approach, the Only True Mis Approach in Total KneeINTRODUCTION:*Ibrahim Gado - American Hospital - Dubai, UAESamih Tarabichi - - Dubai, UAE*Email: ibrahim.gado@yahoo.comThe majority of papers covering MIS total knee describe a surgical approach where the quadstendon is violated. This presentation describes a modified subvastus approach using MIStechnique. The results are compared to the regular subvastus approach.file:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]