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Archives of Orthopaedic and Trauma Surgery

, Volume 138, Issue 8, pp 1127–1134 | Cite as

Biomechanical properties of suprapectoral biceps tenodesis: double knotless screw fixation is superior to single knotless screw fixation

  • Chih-Kai Hong
  • Chih-Hsun Chang
  • Florence L. Chiang
  • I-Ming Jou
  • Ping-Hui Wang
  • Hung-Nan Wang
  • Kai-Lan Hsu
  • Fa-Chuan Kuan
  • Wei-Ren Su
Arthroscopy and Sports Medicine
  • 80 Downloads

Abstract

Introduction

The purpose of this study is to biomechanically evaluate a new technique of double knotless screw fixation for suprapectoral biceps tenodesis and compare the results with that of the single knotless screw fixation as well as the interference screw fixation.

Methods

24 fresh-frozen human cadaveric shoulders with a mean age of 68.3 ± 9 years were studied. The specimens were randomly divided into three experimental biceps tenodesis groups (n = 8): single knotless screw, double knotless screw and interference screw. Each tenodesis specimen was mounted on a mechanical testing machine, preloaded for 2 min at 5 N, tested with cyclic loading from 5 to 70 N for 500 load cycles and subjected to an axial load to failure test (1 mm/s). The ultimate failure load, stiffness, cyclic displacement and mode of failure were evaluated.

Results

The interference screw fixation had the highest ultimate failure load (215.8 ± 43.1 N) and stiffness (25.7 ± 5.2 N/mm) which were significantly higher than the corresponding results for the single and double knotless screw groups (P = 0.0029). The double knotless screw group had the second highest ultimate failure load (162.8 ± 13.8 N) and stiffness (15.1 ± 4.1 N/mm) which were significantly higher than the corresponding results for the single knotless screw technique (P = 0.0002). The most common mode of failure was suture slippage for both the double (7/8) and single knotless screw (6/8) groups while biceps tendon tearing occurred most often for the interference screw group (6/8).

Conclusion

In this biomechanical study, the double knotless screw fixation was found to have a significantly greater ultimate failure load and stiffness than the single knotless screw fixation but lower values than the interference screw fixation.

Keywords

Knotless screw Double knotless screw Winding suture Suprapectoral biceps tenodesis Interference screw 

Notes

Funding

There is no funding source.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This article was granted an exemption from the institutional review board (IRB) in a medical center.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Chih-Kai Hong
    • 1
  • Chih-Hsun Chang
    • 1
  • Florence L. Chiang
    • 2
  • I-Ming Jou
    • 3
  • Ping-Hui Wang
    • 4
  • Hung-Nan Wang
    • 5
  • Kai-Lan Hsu
    • 1
  • Fa-Chuan Kuan
    • 1
  • Wei-Ren Su
    • 1
    • 6
    • 7
  1. 1.Department of Orthopaedic Surgery, National Cheng Kung University Hospital, College of MedicineNational Cheng Kung UniversityTainanTaiwan
  2. 2.University of Texas Health Science Center at San Antonio School of MedicineSan AntonioUSA
  3. 3.Department of Orthopedics, E-Da HospitalI-Shou UniversityKaohsiungTaiwan
  4. 4.Department of Orthopaedic SurgeryChi-Mei Medical CenterTainanTaiwan
  5. 5.Department of NursingMin-Hwei College of Health Care ManagementTainanTaiwan
  6. 6.Medical Device Innovation CenterNational Cheng Kung UniversityTainanTaiwan
  7. 7.Medical Device R & D Core LaboratoryNational Cheng Kung University HospitalTainanTaiwan

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