Biomechanical analysis of orthogonal and unilateral locking plate constructs in a fracture gap model.

IF 1.3 2区农林科学 Q2 VETERINARY SCIENCES Veterinary Surgery Pub Date : 2025-05-01 Epub Date: 2025-02-19 DOI:10.1111/vsu.14206

Peter J Welsh, Adam M Nylund, Peter J Gilbert, Nick A Smith, Lloyd V Smith

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Abstract

Objective: To compare unilaterally plated (UP) constructs and orthogonally plated (OP) constructs of differing sizes (3.5 mm + 2.0 mm locking plates [OP2.0], 3.5 mm + 2.4 mm locking plates [OP2.4] and 3.5 mm + 3.0 mm locking plates [OP3.0]) under cyclic and static axial compression load to failure testing using a fracture gap model.

Study design: In vitro experimental biomechanical study.

Sample population: Acetal homopolymer (Delrin) rods stabilized with locking plates and screws (Arthrex OrthoLine).

Methods: One of four stabilization techniques (UP, OP2.0, OP2.4, OP3.0) was applied to rods with a fixed fracture gap. Constructs were fatigue tested under axial compression (90,000 cycles; 4-196 N) followed by static load to failure. Cyclic displacement was evaluated after the first, middle, and last 100 cycles. Stiffness and strength were analyzed during static axial compression load to failure.

Results: During cyclic testing, UP experienced 3.5, 3.8, and 4.1 times the gap strain of OP2.0, OP2.4, and OP3.0, respectively (p < 0.0075). Fatigue and construct design had significant effects on displacement (p < .0001). OP2.0, OP2.4, and OP3.0 demonstrated 2.5, 3.0, and 4.1 times the strength and 3.0, 3.6, and 4.2 times the stiffness of UP, respectively (p < .0002).

Conclusion: In the present in vitro fracture gap model, OP constructs were stronger and stiffer than UP under dynamic and static axial compression, and OP stiffness increased with increasing implant size.

Clinical significance: The results of this study demonstrate objective biomechanical advantages of OP compared to UP. Based on these results, orthogonal plating can be considered when increased fixation strength and stiffness are warranted.

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正交和单侧锁定钢板结构在骨折间隙模型中的生物力学分析。

目的：比较不同尺寸（3.5 mm + 2.0 mm锁定钢板[OP2.0], 3.5 mm + 2.4 mm锁定钢板[OP2.4]和3.5 mm + 3.0 mm锁定钢板[OP3.0]）的单侧镀（UP）假体和正交镀（OP）假体在循环和静态轴向压缩载荷下的失效测试，采用骨折间隙模型。研究设计：体外实验生物力学研究。样品群体：缩醛均聚物（Delrin）棒与锁定板和螺钉（Arthrex OrthoLine）稳定。方法：采用四种稳定技术（UP、OP2.0、OP2.4、OP3.0）中的一种对骨折间隙固定的棒体进行固定。结构体在轴压下进行疲劳测试(90000次循环；4-196 N)，然后静载荷直至失效。在前100次、中100次和最后100次循环后评估循环位移。在静轴压载荷作用下进行了刚度和强度分析。结果：在循环试验中，UP的间隙应变分别是OP2.0、OP2.4和OP3.0的3.5倍、3.8倍和4.1倍(p)。结论：在本体外骨折间隙模型中，OP构建体在动、静态轴向压缩下比UP更强、更硬，且OP刚度随种植体尺寸的增加而增加。临床意义：本研究结果客观证明了OP相对于UP的生物力学优势。基于这些结果，当需要增加固定强度和刚度时，可以考虑正交镀。

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来源期刊

Veterinary Surgery 农林科学-兽医学

CiteScore

3.40

自引率

22.20%

发文量

162

审稿时长

8-16 weeks

期刊介绍： Veterinary Surgery, the official publication of the American College of Veterinary Surgeons and European College of Veterinary Surgeons, is a source of up-to-date coverage of surgical and anesthetic management of animals, addressing significant problems in veterinary surgery with relevant case histories and observations. It contains original, peer-reviewed articles that cover developments in veterinary surgery, and presents the most current review of the field, with timely articles on surgical techniques, diagnostic aims, care of infections, and advances in knowledge of metabolism as it affects the surgical patient. The journal places new developments in perspective, encompassing new concepts and peer commentary to help better understand and evaluate the surgical patient.