Alterations in Stress Distribution and Micromotion Characteristics due to an Artificial Defect within a Composite Tibia used for Mechanical/Biomechanical Evaluation of Total Knee Arthroplasty

다국어 초록 (Multilingual Abstract)

Artificial composite tibiae have been widely used for mechanical evaluations of total knee arthoplasty (TKA) because of their low variability and wide availability. However, little information is available about whether artificial defects created during production significantly change the distribution of stress and micromotion within composite tibiae during a mechanical evaluation for TKA. The purpose of this study was to determine the effects of artificial defects on alterations in stress distribution and micromotion in composite tibiae during a mechanical evaluation for TKA using finite element (FE) analysis. The results showed that von Mises stresses near the artificial defect were approximately 1.6-fold higher than those on the same regions of composite tibiae without artificial defects.
However, the difference in von Mises stresses decreased gradually beginning 3 mm from the center of the artificial defect. Micromotion in composite tibiae with artificial defects was similar to that of tibiae without artificial defects. These findings suggest that stress/strain on the cortical bone surface should be measured at least 3 mm from artificial defect centers but that micromotion is not affected by the artificial defects during a mechanical evaluation for TKA using composite tibiae.

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