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wear rates compared to the non-edge loaded group. The devices in the edge loaded group alsoshowed a greater scatter with unpredictable linear wear.FiguresFriday, October 8, 2010, 16:30-17:30Session B15: MIS Techniques in TKAUsefulness of New Distal Femoral Cutting Guide for MIS-TKA*Sadafumi Ichinohe - Iwate Med. Univ. - Morioka, JapanYoichi Kamei - Iwate Medical university - morioka, japanSeiji Tokunaga - Morioka Municipal hospital - Morioka, JapanMakoto Suzuki - Iwate Medical university - Morioka, Japan*Email: Sadaichi@iwate-med.ac.jp(Purpose) Many TKA instruments were developed in these days. Distal femoral cutting guideusing intra-medullary system were divided into two methods, from anterior or medial. Manycompanies employed anterior cutting guide, however these guides have a disadvantage of wideskin and quadriceps incision. Only Zimmer provided medial cut guide which performed shortskin and quadriceps incision. However, reference point (medial femoral condyle) will be a riskof imprecise cutting for a medial condyle defect cases. We tried L-shaped new distal femoralcutting guide, reference point will be both femoral condyle and cutting from antero-medial side.The purpose of this study was to prove usefulness of the new guide.(Materials and Methods) Twenty-nine knees were employed in this study. All knees weretreated with Optetrak knee system (Exactec). Surgical methods were as follows, mid line skinincision, short para-patellar deep incision, no patellar resurfacing, PS type implant and cementfixation were employed. 13 knees were used original anterior cutting guide (O group) and 16knees were used new antero-medial cut guide (N group). Study items were length of skinincision, length of Quadriceps incision, surgical time, JOA score, and component tilting angles(implant position were compared to femoral axis with AP and lateral view of roentgenograms).(Results) Average skin incision was 11.7cm in O group and 10.6cm in N group. AverageQuadriceps incision was 4.1cm in O group and 2.9cm in N group. There were significantdifference in length of skin incision and length of Quadriceps incision. Average surgical timewas 155min in O group and 147min in N group. Average component angles of AP view were84 deg. in O group and 83 deg. in N group. Average component angles of lateral view were 99deg. in O group and 99 deg. in N group. There were no significant differences between O groupand N group in surgical time, component angles, amount of bleeding, and post surgical JOAscores.(Conclusions) New distal femoral cutting guide demonstrated same precise cutting compared tooriginal guide. New distal femoral cutting guide achieved small skin incision and smallquadriceps incision which is useful for MIS-TKA.file:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]