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and it’s the highest rate has been reported for an uncemented stem in the third decade.Poster: 19Cement Penetration in Impaction Bone Grafting by YU Revision System:Experimental Study*Katsuyuki Dairaku - Saiseikai Yamagata Saisei Hospital - Yamagata, JapanYasunobu Tamaki - Department of Orthopaedic Surgery, Saiseikai Yamagata Saisei Hospital -Yamagata, JapanHiroyuki Kawaji - Department of Orthopaedic Surgery, Saiseikai Yamagata Saisei Hospital -Yamagata, Japan*Email: dairaku@zj8.so-net.ne.jpBackground: The impaction bone graft (IBG) technique is one of the important surgicaltechnique to recover bone stock and obtain implant stability in revision for failed femoral stemwith extensive bone defect. The purpose of this study is to evaluate the thickness of the cementmantle and grafted layer, and cement penetration to the grafted layer in the improved IBGtechnique by experimental model.Materials and methods: Frozen swine femoral head and distal femur were morsellized by combtype bone mill. Mosellized bone was impacted into five sawbones (model no. 1193, Sawbones,USA). YU revision system (JMM, Osaka, Japan) was used for IBG procedure. The canal offemur was completely packed with morsellized bone at first and reamed by drill through theguide pin. Finally, the medullar space was finished up with the stem impactor and bone pusher.Helical CT scan (Aquilion 16, Toshiba, Japan) was examined after removal of the stem toanalyze the thickness of the cement mantle and grafted layer, and cement penetration to thegrafted layer.Results: Average thickness of cement mantle was 1.32 mm (0.84 - 2.02 mm) and averagethickness of Grafted layer was 3.26 mm (1.08 - 10.07 mm). Cement penetration was found atany slice level, and some of which reached to the endosteal of the sawbone.Discussion: IBG technique with morselized allogenic bone to the patient with small femur andnarrow canal is difficult. Grafted layer tends to insufficient especially at middle part of theimplant. Our modified IBG technique is useful to make the grafted layer safety and uniformly.It is reported the structure characteristic of the cement and grafted morsellized bone complex isone of the important factor on primary stability of the implant. The results of this study seemedto indicate strong mechanical strength.Conclusion: Our modified IBG technique was useful for the formation of adequate cementmantle and the grafted layer.file:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]