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Knee Surgery, Sports Traumatology, Arthroscopy

, Volume 22, Issue 9, pp 2228–2236 | Cite as

Biomechanical evaluation of knotless anterior and posterior Bankart repairs

  • Frank Martetschläger
  • Max P. Michalski
  • Kyle S. Jansson
  • Coen A. Wijdicks
  • Peter J. MillettEmail author
Shoulder

Abstract

Purpose

The value of modern tape-like suture materials and the influence of the number of anchors inserted for arthroscopic Bankart repairs compared to the intact state have yet to be investigated. It was hypothesised: (1) suture-tape repairs will show higher biomechanical strength than common suture repairs, (2) four anchors will be stronger than three, and (3) the strength of the native capsulolabral complex will be greater than repairs.

Methods

Six matched-paired cadaveric shoulders received Bankart lesions/reconstructions and three underwent intact state testing. Anteroinferior repairs compared suture and suture-tape repairs using three anchors, while posteroinferior repairs compared three and four suture anchors using common sutures. An established testing protocol was run for biomechanical testing.

Results

There was no significant difference in the maximum loads, loads at 2 mm displacement, stiffness or energy between repair groups or between repairs and the intact state (n.s.). However, failure modes were different: 16/24 (66.7 %) of the repair groups showed glenoid labrum detachment compared to 2/12 (16.7 %) within the intact state group (P = 0.012).

Conclusions

While biomechanical parameters of repairs and intact states showed equivalence, failure-mode analysis reaffirms previous findings that capsulolabrum complex refixation is weaker than the native attachment. Therefore, in daily clinical practice, type of suture is secondary and insertion of a fourth anchor will be unlikely to add strength but may confer additional risk and cost.

Keywords

Bankart repair Glenohumeral joint Stabilisation Knotless suture anchor Shoulder instability 

Notes

Acknowledgments

The authors wish to thank Grant Dornan, M.Sc., for his contribution of statistical expertise to the analysis in this study.

Conflict of interest

One or more of the authors has declared the following potential conflict of interest or source of funding: This research study was funded by an unrestricted donation of surgical supplies by Arthrex Inc. Dr. Millett is a consultant for Arthrex Inc.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Frank Martetschläger
    • 1
    • 3
  • Max P. Michalski
    • 1
  • Kyle S. Jansson
    • 1
  • Coen A. Wijdicks
    • 1
  • Peter J. Millett
    • 2
    Email author
  1. 1.Department of BioMedical EngineeringSteadman Philippon Research InstituteVailUSA
  2. 2.The Steadman ClinicVailUSA
  3. 3.Department for Orthopaedic Sports MedicineClinic rechts der Isar, Technical University MunichMunichGermany

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