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Stress Analysis of Improper Femur Cut in Total Knee Arthroplasty by Finite Element Method

  • W. L. Su (a1), K. D. You (a1), C. C. Yang (a2), J. J. Wu (a2) and M. K. Yeh (a1)...

Abstract

Precise bone cut is fundamental in total knee arthroplasty. However, notching of anterior femoral is not uncommon in clinical practice. Reviewing the article, notching and its complication may reach up to 30% and 2.5%, and there is scanty study of notching on the femoral strength. We therefore conduct the finite element analysis to elucidate the effect of notching on femoral mechanical strength. The computerized tomography images were used as the basis to develop the knee model, which was assumed mainly to consist of cortical and cancellous bones. For the implant joint, Zimmer data was considered partly as the basis to develop the model. This study investigated the femoral improper cut effect on the surgery with a static standing condition. The results show that the anterior femoral cut should be undercut 2 mm to overcut 1 mm during the surgery, in order to prevent bone materials from yielding. The exposure of the cancellous bone may cause bone materials to yield when the femur overcut was 2 mm; the cancellous bone may load too much and result in a fracture when the undercut was 3 mm. The effect of undercut, which was rarely discussed, was particularly addressed in our study. Precise femoral cut is crucial for the longevity of total knee arthroplasty.

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Corresponding author

*Corresponding author (mkyeh@pme.nthu.edu.tw)

References

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Keywords

Stress Analysis of Improper Femur Cut in Total Knee Arthroplasty by Finite Element Method

  • W. L. Su (a1), K. D. You (a1), C. C. Yang (a2), J. J. Wu (a2) and M. K. Yeh (a1)...

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