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 : 2025-02-19 DOI:10.1111/vsu.14206

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

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引用次数: 0

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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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.