Chae Soo-Won, Kang Ju-Yong, Lee Juneyoung, Han Seung-Ho, Kim Soung-Yon
Department of Mechanical Engineering, Korea University, Seoul, South Korea.
Department of Biostatistics, College of Medicine, Korea University, Seoul, South Korea.
J Orthop Res. 2018 Dec;36(12):3318-3327. doi: 10.1002/jor.24135. Epub 2018 Sep 21.
Various types of suture anchor designs are currently available for rotator cuff repair. The purpose of our study was to investigate the pullout strength of such anchors based on their structural design and the predominant geometric design factors affecting the pullout strength using finite element analysis. Finite element models were constructed using five cadaveric humeri and ten suture anchors with different designs. The pullout strength and distribution of bone stress around the anchor at three different directions of the applied force (0°, 45°, and 75°) were analyzed. The following geometric factors of suture anchor design were computed and their correlations with pullout strength assessed: Overall length, minor, and major diameters; number of threads; height of thread; distance between threads; helix angle; contact surface area between the anchor threads and surrounding bone; contact surface area between the cylindrical portion of the anchor; and surrounding bone and total contact surface area between the anchor and surrounding bone. The pullout strength and distribution of bone stress around the anchor varied according to the suture anchor designs and the direction of the applied force, respectively. The pullout strength had a strong positive correlation with the contact surface area between the anchor threads and surrounding bone, overall length, and the number and height of threads. This study demonstrated that suture anchor designs with increased contact surface area between the anchor threads and surrounding bone, overall length, and the number and height of threads can enhance the pullout strength during rotator cuff repair. © 2018 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 36:3318-3327, 2018.
目前有多种类型的缝合锚设计可用于肩袖修复。我们研究的目的是基于其结构设计以及使用有限元分析来研究影响拔出强度的主要几何设计因素，从而探究此类锚的拔出强度。使用五具尸体肱骨和十种不同设计的缝合锚构建有限元模型。分析了在三个不同施力方向（0°、45°和75°）下锚周围的拔出强度和骨应力分布。计算了缝合锚设计的以下几何因素，并评估了它们与拔出强度的相关性：总长、小径和大径；螺纹数量；螺纹高度；螺纹间距；螺旋角；锚螺纹与周围骨之间的接触表面积；锚圆柱部分与周围骨之间的接触表面积；以及锚与周围骨之间的总接触表面积。锚周围的拔出强度和骨应力分布分别根据缝合锚设计和施力方向而变化。拔出强度与锚螺纹与周围骨之间的接触表面积、总长以及螺纹数量和高度呈强正相关。本研究表明，在肩袖修复过程中，增加锚螺纹与周围骨之间的接触表面积、总长以及螺纹数量和高度的缝合锚设计可以提高拔出强度。©2018骨科研究协会。由威利期刊公司出版。《矫形外科学研究》2018年第36卷：3318 - 3327页。
