Development of an Extraosseous Nitinol Implant for the Hallux Valgus Treatment: Preliminary Mechanical Investigations, Design and Numerical Simulation
Development of an Extraosseous Nitinol Implant for the Hallux Valgus Treatment: Preliminary Mechanical Investigations, Design and Numerical Simulation
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DOI：
10.1515/bmt-2012-4368
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发表时间：
2012-09
期刊：
影响因子：
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通讯作者：
V. Heizmann;F. Capanni;T. Engleder;A. Appelt
中科院分区：
文献类型：
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作者：
V. Heizmann;F. Capanni;T. Engleder;A. Appelt
拇外翻是一种复杂的第一排错位，发生在2-4%的人口。由于关节功能的缺陷，畸形导致行走时的问题和疼痛。用于大脚趾轻度和中度矫正手术的标准植入物，即Scarf截骨术，是钛骨螺钉和接骨板，需要经验丰富的外科医生。开发的植入物，一种骨外夹，允许外科医生以减少的手术步骤进行可控和可重复的矫正。成形夹由镍钛诺（一种形状记忆合金）制成。由于镍钛合金的超弹性特性，钛夹获得类似弹簧的效果，作为重建骨碎片上的夹紧力。最终的设计是通过解剖测试，力学计算和有限元分析创建的。每个夹子的最小夹紧力为43 N，与通过生物力学假设计算的术后鞋（OrthoWedge，co. Darco）中的作用力相比，提供了三倍的机械安全性。下一步，需要通过机械测试验证计算出的数字。
The hallux valgus is a complex malposition of the first ray which occurs in 2-4% of the population. The deformity causes problems and pain during walking due to the defected functionality of the joint. Standard implants used for mild and moderate corrective surgery of the big toe the Scarf osteotomy are titanium bone screws and plates and do require well-experienced surgeons. The developed implant, an extraosseous clip, allows the surgeon a controlled and reproducible correction with a reduced number of surgical steps. The clip is made of Nitinol, a shape memory alloy. Due to the superelastic characteristics of Nitinol the clip gets a spring-like effect acting as a clamping force on the reconstructed bone fragments. The final design was created by anatomical tests, mechanical calculations and a finite element analysis. The minimum clamping force per clip is 43 N, offering a threefold mechanical safety compared to the acting forces in the post-operative shoe (OrthoWedge, co. Darco) calculated by biomechanical assumptions. As a next step the calculated figures need to be validated by mechanical testing.