Effect of structural design on the pullout strength of suture anchors for rotator cuff repair

Soo Won Chae, Ju Yong Kang, Juneyoung Lee, Seung Ho Han, Soung Yon Kim

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)3318-3327
Number of pages10
JournalJournal of Orthopaedic Research
Volume36
Issue number12
DOIs
Publication statusPublished - 2018 Dec

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (Ministry of Science, ICT & Future Planning). (No. NRF-2016R1A2B4013297, NRF-2016R1A2B4013885).

Funding Information:
Grant sponsor: National Research Foundation of Korea (NRF) grant funded by the Korean government (Ministry of Science, ICT & Future Planning); Grant numbers: NRF-2016R1A2B4013297, NRF-2016R1A2B4013885. *Correspondence to: Soung-Yon Kim (T: +82-2-920-6843; F: 82-2-6280-5810; E-mail: singsingkr@yahoo.co.kr)

Publisher Copyright:
© 2018 Orthopaedic Research Society. Published by Wiley Periodicals, Inc.

Keywords

  • anchor design
  • finite element analysis
  • geometric factors
  • pullout strength
  • suture anchor

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

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