Stem Requirements of Tibial Augmentations in TKA: A FEA STUDY

摘要

FE simulation showed that case 3 offers the highest stability among the three cases as indicated by the overall stress fields. This trend was observed for both two cases of load application: medial and lateral. However, stress shielding appears to be a potential problem resulting from the use of extended stem augment. Generally, when new designs, such as the Deltafit Keel tibial tray, is used in TKR with bone loss, the construct of tibia tray with block augment only seems from the present results to be adequate. The stem extension could be considered for the cases with larger bone loss than that discussed here. The relationship between the amount of bone defect and the knee stability under the configuration of extended stem could be investigated by means of a similar FEA technique. This study assumed homogenous material properties for both cortical and cancellous bones. The effect of heterogeneous material property on the presented results should be carefully evaluated before any clinical conclusions are made on the present design.