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.

中文翻译：

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全膝关节置换术股骨切割不当的应力分析有限元法

精确的骨切割是全膝关节置换术的基础。然而，股骨前部切迹在临床实践中并不少见。回顾文章，切槽及其并发症可达30%和2.5%，切槽对股骨力量的研究甚少。因此，我们进行了有限元分析，以阐明切口对股骨机械强度的影响。计算机断层扫描图像被用作开发膝关节模型的基础，该模型假设主要由皮质骨和松质骨组成。对于种植体关节，Zimmer 数据被部分视为开发模型的基础。本研究调查了股骨不当切割对静态站立状态手术的影响。结果表明，术中股骨前切口应底切2mm至过切1mm，以防止骨材料屈服。当股骨过切2mm时，松质骨的暴露可能导致骨材料屈服；当咬边为 3 毫米时，松质骨可能会承受过多的负荷并导致骨折。在我们的研究中，很少讨论底切的影响。精确的股骨切割对于全膝关节置换术的寿命至关重要。