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Patterns of tendon retraction in full-thickness rotator cuff tear: comparison of delaminated and nondelaminated tendons

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Abstract

Objective

To analyze full-thickness rotator cuff tears, compare retraction patterns in delaminated and nondelaminated tendons, and correlate retraction distances with anteroposterior tear lengths.

Materials and methods

In 483 MR examinations reported as showing full-thickness cuff tear, two musculoskeletal radiologists independently characterized tendons as delaminated or nondelaminated. Tendon delamination was defined as either horizontal intra-substance splitting of bursal and articular layers by an intervening plane of fluid, or differential retraction of bursal and articular layers. In a subset of 144 shoulders with surgically proven full-thickness cuff tears (45 delaminated, 99 nondelaminated tendons), matched cohorts (n = 45) were further analyzed to compare tendon retraction distance, anteroposterior tear length and retraction ratios (retraction distance/anteroposterior length).

Results

Delamination was present in 13% of 483 total tears, and 31% of 144 operated tears (p = 0.001). In nondelamination and delamination cohorts, mean anteroposterior tear length measured 30.0 and 31.5 mm respectively (p = 0.6). Although nondelaminated tendons showed mean retraction 31.5 mm, articular and bursal layers of delaminated tendons showed mean retractions 36.3 mm and 21 mm respectively (p < 0.0001). Anteroposterior tear length and retraction distance were significantly associated in all cuff tears (p < 0.0001). Retraction ratio for nondelaminated tendons (1.05) was significantly different from retraction ratios for articular (1.21) and bursal (0.70) layers of delaminated tendons (p < 0.0001).

Conclusion

In full-thickness rotator cuff tear, delaminated and nondelaminated tendons show significant differences in retraction distances, despite similarities in anteroposterior dimensions. Delaminated tendons are important to identify and report because they are more likely to fail conservative treatments and undergo operative repairs.

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Acknowledgements

We acknowledge the expert statistical assistance provided by Elkan F. Halpern, PhD.

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Authors and Affiliations

  1. Department of Radiology, University Hospital of Strasbourg, Strasbourg, France

    Guillaume Bierry

  2. Department of Radiology, Massachusetts General Hospital, Harvard Medical School, 55 Fruit Street, YAW 6030, Boston, MA, 02114, USA

    William E. Palmer

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Correspondence to William E. Palmer.

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Bierry, G., Palmer, W.E. Patterns of tendon retraction in full-thickness rotator cuff tear: comparison of delaminated and nondelaminated tendons. Skeletal Radiol 48, 109–117 (2019). https://doi.org/10.1007/s00256-018-3013-6

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  • DOI: https://doi.org/10.1007/s00256-018-3013-6

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