Impact of fractured tibia implant fixation devices on bone stiffness during bending test

IF 1.7 4区 医学 Q3 ENGINEERING, BIOMEDICAL
Hajer Ketata , Naila Hfaiedh , Michèle Kanhonou , Houssem Badreddine
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Abstract

This study focuses on evaluating the failure resistance of a previously reduced tibia with internal fixation implants as PLate (PL) or InterMedullary Nail (IMN), subjected later to a tibial lateral trauma. To replicate this type of trauma, which can be caused by a road accident, a three-point bending test is considered using experimental tests and numerical simulations.

The withstand evaluation of the tibia-PL and tibia-IMN structures was conducted by following the load transfer through, the bone and the used implants. The analysis, up to tibia failure, required the use of an elasto-plastic behavior law coupled to damage. The model parameters were identified using experimental tests.

Il was shown that the tibia-IMN structure provided a bending resistant load up to three-times higher than the tibia-PL. In fact, the used screws for plate fixation induced a high level of stress in the vicinity of threaded region, leading to a crack initiation and a damage propagation. However, in tibia-IMN structure the highest stress was generated in the trapped zone between the loader and the nail, promoting crack formation.

From a biomechanical point of view, the structure with IMN is safer than the structure with PL, whose fixation induces earlier damage in bone.

弯曲试验中胫骨骨折植入固定装置对骨硬度的影响
这项研究的重点是评估胫骨在受到胫骨外侧创伤后,先前已用 PLate(髓板)或髓内钉(IMN)等内固定植入物缩减的胫骨的抗破坏性。胫骨-PL 和胫骨-IMN 结构的耐力评估是通过跟踪骨和所用植入物的载荷传递来进行的。分析直至胫骨失效,需要使用与损伤耦合的弹塑性行为定律。实验表明,胫骨-IMN 结构的抗弯载荷是胫骨-PL 结构的三倍。事实上,用于钢板固定的螺钉会在螺纹区域附近产生高应力,导致裂纹产生和损伤扩展。然而,在胫骨-IMN 结构中,最高应力产生于加载器和钉子之间的滞留区,从而促进了裂纹的形成。从生物力学的角度来看,使用 IMN 的结构比使用 PL 的结构更安全,因为 PL 的固定方式会更早地引起骨骼损伤。
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来源期刊
Medical Engineering & Physics
Medical Engineering & Physics 工程技术-工程:生物医学
CiteScore
4.30
自引率
4.50%
发文量
172
审稿时长
3.0 months
期刊介绍: Medical Engineering & Physics provides a forum for the publication of the latest developments in biomedical engineering, and reflects the essential multidisciplinary nature of the subject. The journal publishes in-depth critical reviews, scientific papers and technical notes. Our focus encompasses the application of the basic principles of physics and engineering to the development of medical devices and technology, with the ultimate aim of producing improvements in the quality of health care.Topics covered include biomechanics, biomaterials, mechanobiology, rehabilitation engineering, biomedical signal processing and medical device development. Medical Engineering & Physics aims to keep both engineers and clinicians abreast of the latest applications of technology to health care.
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