Finite Element Analysis of Transhumeral and Transtibial Percutaneous Osseointegrated Endoprosthesis Implantation.
Finite Element Analysis of Transhumeral and Transtibial Percutaneous Osseointegrated Endoprosthesis Implantation.
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DOI：
10.3389/fresc.2021.744674
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发表时间：
2021-11-23
期刊：
影响因子：
--
通讯作者：
Bachus KN
中科院分区：
文献类型：
--
作者：
Taylor CE;Henninger HB;Bachus KN
经皮骨整合对接系统(Pod)用于骨整合(OI)假体附着体的身体力学测试显示，将精确的系统从肱骨平移到胫骨可能并不合适。尽管形态显示了平移的可行性，但专门为肱骨设计的豆荚在肱骨中获得了比在胫骨中高1.4-4.8倍的机械稳定性。为了更好地理解这种差异，有限元分析(FEA)对豆荚植入骨骼的过程进行了建模。通过CT扫描建立3例身体肱骨和3例胫骨的模型，并进行一系列与骨内膜表面接触但不能穿透外皮质的假体的虚拟植入准备。使用位移斜坡功能模拟假体的最终嵌入，以将假体模型压入骨中。记录撞击力和最大第一主(周)应力，以评估系统的稳定性和骨折风险。我们假设，肱骨和胫骨将有不同的最佳豆荚大小标准，以最大化撞击力和最小化第一主应力。肱骨的最佳大小符合植入说明，而胫骨的最佳大小是指南所示的三倍。这种对撞击力和应力分布的有限元分析使我们相信，同样的内固定策略不适用于胫骨，因为内侧和外侧皮质较薄，影响了植入。
Cadaveric mechanical testing of a percutaneous osseointegration docking system (PODS) for osseointegration (OI) prosthetic limb attachment revealed that translation of the exact system from the humerus to the tibia may not be suitable. The PODS, designed specifically for the humerus achieved 1.4–4.8 times greater mechanical stability in the humerus than in the tibia despite morphology that indicated translational feasibility. To better understand this discrepancy, finite element analyses (FEAs) modeled the implantation of the PODS into the bones. Models from cadaveric humeri (n = 3) and tibia (n = 3) were constructed from CT scans, and virtual implantation preparation of an array of endoprosthesis sizes that made contact with the endosteal surface but did not penetrate the outer cortex was performed. Final impaction of the endoprosthesis was simulated using a displacement ramp function to press the endoprosthesis model into the bone. Impaction force and maximum first principal (circumferential) stress were recorded to estimate stability and assess fracture risk of the system. We hypothesized that the humerus and tibia would have different optimal PODS sizing criteria that maximized impaction force and minimized first principal stress. The optimal sizing for the humerus corresponded to implantation instructions, whereas for the tibia optimal sizing was three times larger than the guidelines indicated. This FEA examination of impaction force and stress distribution lead us to believe that the same endoprosthesis strategy for the humerus is not suitable for the tibia because of thin medial and lateral cortices that compromise implantation.
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影响因子：
4.2
作者：
Jeyapalina, Sujee;Beck, J. Peter;Bachus, Kent N.
通讯作者：
Bachus, Kent N.
影响因子：
--
作者：
Gerzina, Christopher;Potter, Eric;Dabash, Sherif
通讯作者：
Dabash, Sherif
影响因子：
3.5
作者：
Liu, Bo;Ma, Wenhui;Han, Yongtai
通讯作者：
Han, Yongtai
影响因子：
2.8
作者：
Stenlund, Patrik;Trobos, Margarita;Palmquist, Anders
通讯作者：
Palmquist, Anders
影响因子：
2.2
作者：
Helgason, Benedikt;Palsson, Halldor;Viceconti, Marco
通讯作者：
Viceconti, Marco