Study of a near-cortical over-drilling technique on plate constructs with a conical locking system in a rabbit femoral fracture using a finite element model

IF 2.3 4区医学 Q3 ENGINEERING, BIOMEDICAL

Medical Engineering & Physics Pub Date : 2025-07-16 DOI:10.1016/j.medengphy.2025.104399

Geovane José Pereira , Sheila Canevese Rahal , Wendell Monteiro Barboza , Ivan Moroz , Alcides Lopes Leão , Matheus Mesquita Alves , Edson Antonio Capello Sousa , Bruno Agostinho Hernandez

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Abstract

This study aimed to evaluate the near-cortical over-drilling technique on the mechanical behaviour of bone-plate constructs in a rabbit transverse femoral fracture. In vitro biomechanical testing and finite element (FE) models were used for analyses. Rabbits' bones (n = 14) were divided into two groups: G1 - without near-cortical over-drilling, and G2 - with near-cortical over-drilling. Locking stainless-steel plates composed of five holes with titanium bushings were used. A compression test was carried out with load applied eccentrically to the femoral head at a rate of 5 mm/min with load cell capacity of 500 kgf. FE model was created to evaluate differences in stress distributions between G1 and G2. In the vitro tests, the maximum load supported by G2 was statistically higher than G1 (p-value = 0.01 < 0.05), whilst there was no significant difference between the groups in bending stiffness (p-value = 0.12 > 0.05). FE models demonstrated similar behaviour to experimental data in terms of stiffness and biomechanical behaviour for either G1 or G2 (p-value = 0.09 > 0.05). Stress levels were higher for G1, and stress concentration areas were at the experimentally fractured sites. No evident pattern of fracture or stress distribution was observed in the bone for G2. In conclusion, over-drilling increased the maximum load-bearing capacity with a slight decrease in overall stiffness, which could potentially improve bone healing.

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利用有限元模型研究带锥形锁定系统的近皮质过钻技术在兔股骨骨折钢板上的应用

本研究旨在评估近皮质过度钻孔技术对兔股骨横骨折接骨板结构力学行为的影响。采用体外生物力学试验和有限元模型进行分析。将14只家兔骨分为两组：G1组（未近皮质过钻）和G2组（近皮质过钻）。锁紧不锈钢板由五个孔与钛衬套组成。进行了压缩试验，载荷以5毫米/分钟的速率偏心地施加在股骨头上，称重传感器的容量为500 kgf。建立有限元模型评价G1和G2之间应力分布的差异。在体外试验中，G2所承受的最大负荷显著高于G1 (p值= 0.01 <；各组间抗弯刚度差异无统计学意义(p值= 0.12 >；0.05)。在G1或G2的刚度和生物力学行为方面，有限元模型显示出与实验数据相似的行为(p值= 0.09 >；0.05)。G1时应力水平较高，应力集中区位于实验断裂部位。G2未见明显骨折或应力分布。综上所述，过度钻孔增加了最大承重能力，但整体刚度略有下降，这可能会改善骨愈合。

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来源期刊

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.