目前拇趾外翻在先前的手術治療研究中只有探討手術固定板的治療方法，並沒有文獻是針對Kirschner Wire來做更進一步的探討，因此本研究的目的是建立一個完整膝下骨骼肌肉模型與植入物模型，並透過有限元素法探討拇趾外翻治療之骨科力學評估。
本研究使用Solidworks建立完整膝下模型、截骨術植入物及遠近端截骨術模型，接著使用ANSYS Workbench 19.2 進行模擬。本研究主要探討遠端及近端截骨術，配合不同方法、角度、深度的Kirschner Wire固定方法，以正常站立及前足站立負載模擬，比較其穩定度、蹠骨應力、植入物應力、截骨面的正向壓力。
克氏針打入之深淺結果顯示，打入至後方楔形骨會使第一蹠骨應力些微提升及植入物應力大幅提升，但截骨面之正向壓力卻反之下降。而在第一蹠骨截骨術整體評比中顯示出遠端截骨術單支固定-淺(DSS)擁有最好的手術穩定度、骨頭較不易破裂、植入物較不易破壞及有良好的截骨面接觸壓力能促使手術截面癒合。
結論得出克氏針打入之深淺在本研究中顯示打入至後方楔形骨(深)較差，而透過近端截術正規化評比可以得出DSS擁有最好的優勢，但實際情況中若第一蹠骨角度偏差太大無法使用遠端截骨術，則本研究指出近端截骨術大角度交叉-淺(PLCS)，在近端截骨術中擁有較好的優勢。

Hallux valgus is one of the most common foot deformity, which caused the dislocation of the metatarsophalangeal joint (MTP). Over a hundred different types of operations have been described for the treatment of hallux valgus. However, there are no studies specifically investigating the Kirschner wire fixation. The purpose of this study was to develop a three-dimensional human musculoskeletal lower extremity model to investigate the different types of Kirschner wire fixation for hallux valgus by using finite element (FE) method with motion analysis.
Three-dimensional human musculoskeletal lower extremity models with ten types of Kirschner wire fixation were developed using SolidWorks. Ten types of Kirschner wire fixation consider different method, depth, angle of Kirschner wire on proximal and distal osteotomy. In this study, 20 FE analyses were conducted using ten types of tread pattern design with two positions: standing position and forefoot standing. The FE simulations were performed by using the ANSYS Workbench 19.2. In post-processing, the fixation stability, the contact pressure of the osteotomy plan, the stress of metatarsal and implants were calculated to evaluate the performances of Kirschner wire fixation.
The results showed that the shallow fixation method had lower first tibia and implant stress than that of the deep fixation method both in proximal and distal osteotomy. For the results of contact pressure on the osteotomy plane, the shallow fixation method had higher value of contact pressure than that of the deep fixation method. Normalization method was applied for evaluating the performance of ten types fixations with four indicators. The normalizing results showed that the distal osteotomy single-short (DSS) had the best advantage of fixation performance in metatarsal osteotomy.
In conclusion, the results of this study suggest that cuneiform fracture and fixation failure were more likely to occur in the case of deep fixation method. The normalizing results revealed that DSS had the best advantage of fixation performance than others in distal osteotomy. This study can provide useful information for surgeons to understand the biomechanics of Kirschner wire fixation.

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