Effect of thread direction on rotational stability in lag-screw fixation of sacroiliac luxation: An ex vivo cadaveric study in small-breed dogs.

IF 1.3 2区农林科学 Q2 VETERINARY SCIENCES Veterinary Surgery Pub Date : 2024-11-09 DOI:10.1111/vsu.14188

SeungPyo Bae, YoungJin Jeon, Haebeom Lee, Jaemin Jeong

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Abstract

Objective: To assess the effect of screw thread direction on rotational resistance in canine sacroiliac (SI) luxation models using left- and right-handed screws.

Study design: Controlled laboratory study.

Sample population: Twenty-four adult canine pelves with proximal femora were examined.

Methods: Four groups (n = 6 each) were established: right-handed screw/right SI luxation (RhRSI), right-handed screw/left SI luxation (RhLSI), left-handed screw/left SI luxation (LhLSI), and left-handed screw/right SI luxation (LhRSI). Under fluoroscopy, 2.4 mm cortical screws were placed into the SI joint in a lag fashion. An acute failure test measured force and torque at yield and peak points, with the ilium and femur positioned at a 108° angle and displacement at 0.099 cm/s. Torque (N cm) was calculated from force (N) and the moment arm (cm).

Results: Differences in median torque were found at yield and peak points. RhRSI gave 50.08 N cm versus 16.01 N cm for RhLSI (p < .01), and LhLSI showed 39.42 N cm versus 19.93 N cm for LhRSI (p < .03). At peak, RhRSI recorded 67.55 N cm compared to 28.14 N cm for RhLSI (p < .01), and LhLSI reached 51.79 N cm versus 28.28 N cm for LhRSI (p < .05). All samples failed by rotation without screw breakage or fractures.

Conclusion: Right-handed screws provided greater rotational resistance in right-sided luxation, and left-handed screws in left-sided luxation, which demonstrated that screw thread direction influenced fixation stability in SI luxation.

Clinical significance: The findings suggest that selecting screw thread direction can enhance biomechanical stability in SI luxation repair, improving surgical outcomes for affected dogs.

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螺纹方向对骶髂关节松弛滞后螺钉固定旋转稳定性的影响：小型犬尸体外研究。

目的：评估使用左旋和右旋螺钉的犬骶髂关节（SI）松弛模型的旋转阻力：评估使用左旋和右旋螺钉的犬骶髂关节（SI）松弛模型中螺钉螺纹方向对旋转阻力的影响：研究设计：实验室对照研究：研究设计：实验室对照研究：方法：分为四组（每组6只）：右手螺钉/右侧SI松弛（RhRSI）、右手螺钉/左侧SI松弛（RhLSI）、左手螺钉/左侧SI松弛（LhLSI）和左手螺钉/右侧SI松弛（LhRSI）。在透视下，将2.4毫米的皮质螺钉以滞后方式植入SI关节。在髂骨和股骨呈108°角、位移速度为0.099厘米/秒的情况下，进行急性失效测试，测量屈服点和峰值点的力和扭矩。扭矩（牛顿厘米）由力（牛顿）和力矩臂（厘米）计算得出：在屈服点和峰值点发现了扭矩中值的差异。RhRSI 扭矩为 50.08 牛顿/厘米，而 RhLSI 扭矩为 16.01 牛顿/厘米（P右旋螺钉为右侧关节松动提供了更大的旋转阻力，左旋螺钉为左侧关节松动提供了更大的旋转阻力，这表明螺钉螺纹方向影响了SI关节松动的固定稳定性：临床意义：研究结果表明，选择螺纹方向可以提高SI松弛修复的生物力学稳定性，改善患犬的手术效果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.