Abstract

Objective The aim of this study was to determine the effect of insertion torque and angulation on the push-out strength of screws in Atraumatic Rigid Fixation (ARIX) system.

Materials and Methods In vitro mechanical tests of the ARIX system were conducted. Screw plate constructs (n = 120) were tested using five different insertion torques at four different angles relative to the perpendicular axis of the plate. Before the push-out test, screws were locked into the plates, and the push-out force of the screw was measured by applying a load parallel to the screw axis.

Results Implant failure was observed at 0.8 Nm at an insertion angle of 15 degrees, and at 1 Nm at 0 degree, 5 degrees and 10 degrees. Two types of failures were observed: cold welding and plate deformation. An insertion torque of 0.8 Nm produced a significantly higher push-out force compared with 0.2 Nm. Non-angled specimens with 0.8 Nm insertion torque exhibited significantly higher screw push-out forces compared with other tested specimens and insertion angles. Insertion angle did not affect screw push-out force at insertion torques of 0, 0.2, 0.4 and 0.6 Nm.

Conclusion The ARIX locking system is much more sensitive to insertion torque than angle. An effect of insertion angle was observed only at an insertion torque of 0.8 Nm, under which all angles significantly decreased push-out force relative to zero degrees of angulation. In addition, low insertion torques can result in screws loosening over time, while greater insertion torques than 1 Nm can result in screw head stripping and plate hole deformation.

Authors' Contributions

Hye-Jin Jung contributed to conception of study, study design, acquisition of data and data analysis and interpretation. Aram Jang contributed to acquisition of data. Hyeong-Jun Yim contributed to data analysis and interpretation. Jae-Hoon Lee contributed to conception of study, study design, and data analysis and interpretation. Chang-Hoon Han, Aram Jang, Hye-Jin Jung and Jae-Hoon Lee drafted and approved the submitted manuscript.

Publication History

Received: 03 February 2020

Accepted: 21 July 2020

Publication Date:
16 October 2020 (online)

© 2020. Thieme. All rights reserved.

Georg Thieme Verlag KG
Stuttgart · New York

中文翻译：

---

螺钉插入扭矩对混合多轴锁定系统机械性能的影响

摘要

目的 本研究的目的是确定插入扭矩和角度对无创伤刚性固定 (ARIX) 系统中螺钉推出强度的影响。

材料和方法 进行了 ARIX 系统的体外机械测试。 在相对于板的垂直轴的四个不同角度，使用五种不同的插入扭矩测试螺钉板结构 ( n = 120)。在推出试验之前，将螺钉锁定在板中，并通过施加平行于螺钉轴线的载荷来测量螺钉的推出力。

结果 在 0.8 Nm 处以 15 度插入角度观察到植入物失败，在 1 Nm 处以 0 度、5 度和 10 度插入。观察到两种类型的故障：冷焊和板变形。与 0.2 Nm 相比，0.8 Nm 的插入扭矩产生了明显更高的推出力。与其他测试样品和插入角度相比，具有 0.8 Nm 插入扭矩的非角度样品表现出显着更高的螺钉推出力。在 0、0.2、0.4 和 0.6 Nm 的插入扭矩下，插入角度不影响螺钉推出力。

结论 ARIX 锁定系统对插入扭矩比角度更敏感。仅在 0.8 Nm 的插入扭矩下观察到插入角度的影响，在此情况下，所有角度都显着降低了相对于零角度的推出力。此外，随着时间的推移，低插入扭矩会导致螺钉松动，而大于 1 Nm 的插入扭矩会导致螺钉头脱落和板孔变形。

作者的贡献

Hye-Jin Jung 对研究概念、研究设计、数据获取以及数据分析和解释做出了贡献。Aram Jang 为数据的获取做出了贡献。Hyeong-Jun Yim 为数据分析和解释做出了贡献。Jae-Hoon Lee 对研究概念、研究设计以及数据分析和解释做出了贡献。Chang-Hoon Han、Aram Jang、Hye-Jin Jung 和 Jae-Hoon Lee 起草并批准了提交的手稿。

出版历史

收稿日期：2020 年 2 月 3 日

接受日期：2020年 7 月 21 日

出版日期：
2020 年 10 月 16 日（在线）

© 2020. 蒂姆。版权所有。

Georg Thieme Verlag KG
斯图加特·纽约