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RESULTS. In Group 1, average bone preparation was 5.13 + 2.70 degrees of varus and 7.40 +2.59 degrees of posterior slope. Final implant position was 3.56 + 1.93 degrees of varus and5.19 + 3.37 degrees of slope. The variance from intended position was 2.31 + 1.74 degrees ofvarus and 3.80 + 2.90 degrees of slope. For Group 2, average bone preparation was 5.26 + 3.70degrees of varus and 5.49+ 2.39 degrees of posterior slope. Final implant position was 6.58 +3.40 degrees of varus and 6.11 + 2.39 degrees of slope. The variance from intended positionwas 1.82 + 1.42 degrees of varus and 1.39 + 1.48 degrees of slope. ANOVA revealed nodifferences between groups regarding bone prep in the coronal plane, final implant slope, orvariation from intended coronal position. However, bone prep in the sagittal plane showedstatistically significant more slope for Group 1 (p = 0.03), increased slope in Group 2 (p=0.004),and greater variation from intended sagital position for Group 1.CONCLUSIONS. Independent cementing of implants showed decreased variation in final tibialcomponent position. However, some implants showed up to 6 degrees of malposition from theintended position. We believe this to be a shortcoming of the inlay style of tibial componentfor UKA, which even cannot be overcome with the precision and accuracy of a robotic armassistant.Friday, October 8, 2010, 7:30-8:30Session B9: Complications in ArthroplastyEradication of Negative Bone Remodelling Using the C-Stem Polished,Triple-Tapered Femoral Implant*David Sochart - NORTH MANCHESTER GENERAL HOSPITAL - Manchester, UNITEDKINGDOMNargis Chaudhary - north manchester general hospital - manchester, united kingdom*Email: sochart@hotmail.co.ukNegative remodelling of the femoral cortex in the form of calcar resorption due to stressshielding,and femoral cortical hypertrophy at the level of the tip of the implant due to distalload transfer, is frequenly noted following cemented total hip replacement, most commonlywith composite beam implants, but also with polished double tapered components.The C-stem polished femoral component was designed with a third taper running from lateral tomedial across and along the entire length of the implant, with the aim of achieving moreproximal and therefore more natural loading of the femur. The implant is designed tosubside within the femoral cement mantle utilising the cement property of creep, generatinghoop stresses, which are transferred more proximally to the femoral bone, starting at the level ofthe medial calcar. The intention is to load the proximal femur minimising stress-shielding andcalcar resorption, as well as reducing distal load transfer as signified by the lack of distalfemoral cortical hypertrophy.file:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]