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Biomechanical comparison of the primary stability of suturing Achilles tendon rupture: a cadaver study of Bunnell and Kessler techniques under cyclic loading conditions

  • Arthroscopy and Sports Medicine
  • Published:
Archives of Orthopaedic and Trauma Surgery Aims and scope Submit manuscript

Abstract

Introduction

Biomechanical studies investigating suture techniques for Achilles tendon repair used single load to failure tests in order to evaluate the maximal load capacity of the repaired construct. During early rehabilitation the repair is repetitively loaded such as exercise or daily living activities like walking. Cyclic loading seems to duplicate the physiological loading conditions more closely than single cycle failure tests. Aim of this study was to test the most commonly used Achilles tendon repair techniques (Bunnell and Kessler repair) under cyclic loading conditions.

Materials and methods

Following tenotomy fresh human cadaveric tendons were sutured either with the Bunnell or Kessler technique. After repair, cyclic loading tests were performed with a uniaxial biomechanical testing machine Lloyd LR-5K Plus. Both groups were sutured with 0.7 mm PDS.

Results

Except at maximum load we could not find significant differences between tendons sutured by Bunnell and Kessler techniques. During the cyclic testing there were no differences between both groups with respect to displacement. This applies also to the stiffness of the constructs, which we defined from the load to failure measurements. The failure modes in both groups differed; the tendons repaired by Kessler technique were cut by the tendons and in the Bunnell group the suture material tore in each specimen tested.

Conclusion

In our study Bunnell and Kessler techniques showed similar biomechanical properties using the same suture material. The typical failure mode of the Bunnell technique shows potential to optimise biomechanical behavior by using stronger suture material.

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Authors and Affiliations

  1. Department of Trauma, Hand and Reconstructive Surgery, Westfaelische, Wilhelms, University Muenster, Waldeyerstrasse 1, 48149, Munster, Germany

    Mirco Herbort, Axel Haber, Thore Zantop, Steffen Rosslenbroich, Michael J. Raschke & Wolf Petersen

  2. Department of Orthopaedic Surgery, Westfaelische, Wilhelms, University Muenster, Muenster, Germany

    Georg Gosheger

Authors
  1. Mirco Herbort
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  2. Axel Haber
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  3. Thore Zantop
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  4. Georg Gosheger
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  5. Steffen Rosslenbroich
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  6. Michael J. Raschke
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  7. Wolf Petersen
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Correspondence to Mirco Herbort.

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Herbort, M., Haber, A., Zantop, T. et al. Biomechanical comparison of the primary stability of suturing Achilles tendon rupture: a cadaver study of Bunnell and Kessler techniques under cyclic loading conditions. Arch Orthop Trauma Surg 128, 1273–1277 (2008). https://doi.org/10.1007/s00402-008-0602-1

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  • DOI: https://doi.org/10.1007/s00402-008-0602-1

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