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The effect of rotator cuff malreduction on tendon tension: an evaluation of a custom-made digital tensiometer clamp

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

Abstract

Introduction

Rotator cuff tears are common and good-to-excellent clinical outcome is reported after subsequent repair. However, the retear rate of rotator cuff repairs has been shown to be as high as 20%. The reasons for retear seem to be multifactorial, mainly comprised by mechanical and biological aspects. Regarding mechanical causes, the role of the tendon tension and malreduction is so far unknown. First, we hypothesized that the tendon tension depends on the technique of tendon reposition and that malreduction of the tendon results in an increased tendon tension. Second, we aimed to demonstrate the inter- and intraobserver reliability of a novel custom-made digital tensiometer clamp.

Materials and methods

A tendon defect of posterosuperior rotator cuff (reverse L-shaped) was simulated in seven cadaveric human shoulder specimens. By use of a custom-made tensiometer clamp, the supraspinatus tendon was reduced by pulling it in (1) an anterolateral direction (anatomical reduction) and (2) in a straight lateral direction (malreduction) until the footprint was completely covered. The reduction procedure was consecutively repeated to evaluate the inter- and intraobserver reliability.

Results

The mean traction forces for anatomical reduction and malreduction were 16.02 N (SD 8.06) and 19.52 N (SD 9.95), respectively. The difference between the two groups was statistically significant (p = 0.028). The interobserver reliability showed a correlation of r = 0.757 [95% confidence interval (CI) 0.092–0.955]. The intraobserver reliability of the three surgeons was observed to be between r = 0.905 and 0.986.

Conclusions

The malreduction of the rotator cuff has a significant influence on the tendon tension and may therefore affect the healing rate of the tendon after the repair, so that a tension-balanced repair could improve the clinical results. Furthermore, the application of a novel custom-made tensiometer clamp showed good interobserver and excellent intraobserver reliabilities.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, Medical School Hannover, Anna-von-Borries Straße 1-7, 30625, Hannover, Germany

    Marc-Frederic Pastor, Tomas Smith & Mathias Wellmann

  2. Laboratory of Biomechanics and Biomaterials, Medical School Hannover, Hannover, Germany

    Manuel Kraemer, Michael Schwarze & Christof Hurschler

Authors
  1. Marc-Frederic Pastor
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  2. Manuel Kraemer
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  3. Michael Schwarze
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Correspondence to Mathias Wellmann.

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Conflict of interest

Pastor MF, Kraemer M, Schwarze M, Hurschler C, Smith T, and Wellmann M declare that they have no conflict of interest.

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Pastor, MF., Kraemer, M., Schwarze, M. et al. The effect of rotator cuff malreduction on tendon tension: an evaluation of a custom-made digital tensiometer clamp. Arch Orthop Trauma Surg 138, 219–225 (2018). https://doi.org/10.1007/s00402-017-2823-7

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