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Biomechanical evaluation of four different transosseous-equivalent/suture bridge rotator cuff repairs

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Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

Purpose

Evaluate the biomechanical behavior of four variants of the transosseous-equivalent/suture bridge (TOE/SB) repair.

Methods

Four suture bridge (SB) constructs were created using 24 sheep infraspinatus tendon-humerus constructs (n = 6 per technique). The groups were (1) Knotted Standard Suture Bridge (Standard SB)—suture bridge with two medial mattress stitches, (2) Knotted Double Suture Bridge (Double SB)—four medial mattress stitches, (3) Untied Suture Bridge with Medial FT Anchors (Untied SB with FT)—two medial mattress stitches without knots, and (4) Untied Suture Bridge with PushLocks (Untied SB with Pushlocks)—two medial mattress stitches without knots. The contact area footprint was measured with an electronic pressure film prior to dynamic mechanical testing for gapping and testing to failure.

Results

The Double SB produced the greatest contact area footprint compared to the other techniques, which did not differ. The Double SB repair with a mean failure load of 456.9N was significantly stronger than the Untied SB with Pushlocks repair at 300N (P = 0.023), the standard SB repair at 295N (P = 0.019), and lastly the Untied SB with FT repair at 284N (P = 0.011). No differences were detected between the two mattress stitch standard SB repair with knots and the knotless two mattress stitch repairs (Untied SB with FT and Untied SB with Pushlocks). Gaps developed during cyclic loading in all repairs apart from the Double SB repair.

Conclusions

The transosseous-equivalent/suture bridge repair with 4 stitches tied in the medial row and maximal lateral suture strand utilization (Double SB) outperformed all other repairs in terms of failure load, tendon–bone contact, and gapping characteristics. The presence of knots in the medial row did not change tendon fixation with respect to failure load, contact area or gapping characteristics.

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Author information

Authors and Affiliations

  1. University of New South Wales, Randwick, Australia

    Michael Maguire, Nicky Bertollo, Matthew Henry Pelletier & William R. Walsh

  2. Orthosports, Randwick, Australia

    Jerome Goldberg

  3. Macquarie University, Ryde, Australia

    Desmond Bokor

  4. Prince of Wales Hospital, Randwick, Australia

    Wade Harper

Authors
  1. Michael Maguire
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  2. Jerome Goldberg
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  3. Desmond Bokor
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  4. Nicky Bertollo
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  5. Matthew Henry Pelletier
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  6. Wade Harper
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  7. William R. Walsh
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Corresponding author

Correspondence to Matthew Henry Pelletier.

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Maguire, M., Goldberg, J., Bokor, D. et al. Biomechanical evaluation of four different transosseous-equivalent/suture bridge rotator cuff repairs. Knee Surg Sports Traumatol Arthrosc 19, 1582–1587 (2011). https://doi.org/10.1007/s00167-011-1436-x

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  • DOI: https://doi.org/10.1007/s00167-011-1436-x

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