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 journalArticle

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
JournalJournal of Orthopaedic Research
DOIs
Publication statusAccepted/In press - 2018 Jan 1

Fingerprint

Suture Anchors
Rotator Cuff
Bone and Bones
Finite Element Analysis
Humerus

Keywords

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

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

Cite this

Effect of structural design on the pullout strength of suture anchors for rotator cuff repair. / Chae, Soo Won; Kang, Ju Yong; Lee, Juneyoung; Han, Seung Ho; Kim, Soung Yon.

In: Journal of Orthopaedic Research, 01.01.2018.

Research output: Contribution to journalArticle

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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.",
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