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Subscapularis tendon tears hidden by the medial biceps sling can be missed on arthroscopic examination

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

Abstract

Introduction

To investigate (1) the prevalence of “hidden lesions” and “non-hidden lesions” of subscapularis tendon tears requiring repair during arthroscopic examination that would be missed by a 30° arthroscope, but could be identified by a 70° arthroscope, from the standard posterior portal and (2) the correlation of preoperative internal rotation weakness and findings of magnetic resonance imaging (MRI) indicating hidden lesions.

Materials and methods

We retrospectively examined 430 patients who underwent arthroscopic subscapularis repair between was initially nonvisible with a 30° arthroscope but became visible only with a 70° arthroscope from the standard posterior portal. The preoperative and intraoperative findings of the hidden lesion group (n = 82) were compared with those of the non-hidden lesion group (n = 348). 2016 and 2020. A hidden lesion was defined as a subscapularis tendon tear requiring repair that preoperative internal rotation weakness was assessed using the modified belly-press test. Preoperative MR images were reviewed using a systemic approach.

Results

The prevalence of hidden lesions was 19.1% (82/430). No significant difference was found in preoperative internal rotation weakness between the groups. Preoperative MRI showed a significantly lower detection rate in the hidden lesion group than in the non-hidden group (69.5% vs. 84.8%; P = 0.001). The hidden lesions were at a significantly earlier stage of subscapularis tendon tears than the non-hidden lesions, as revealed by the arthroscopic findings (Lafosse classification, degree of retraction; P = 0.003 for both) and MR findings (muscle atrophy, fatty infiltration; P = 0.001, P = 0.005, respectively).

Conclusions

Among the subscapularis tears requiring repair, 19.1% could be identified by a 70° arthroscope, but not by a 30° arthroscope, through the posterior portal. The hidden lesions showed a significantly lower detection rate on preoperative MRI than the non-hidden lesions. Thus, for subscapularis tears suspected on preoperative physical examination, the 70° arthroscope would be helpful to avoid a misdiagnosis.

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Acknowledgements

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Funding

This study was supported by a faculty research grant from the Yonsei University College of Medicine (6-2018-0067).

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Contributions

J-HK, MD, involved in writing—original draft, conceptualization, data curation, formal analysis, investigation, resources, visualization, approval of the submitted and final versions. W-SD, MD, took part in writing—review and editing, conceptualization, data curation, approval of the submitted and final versions. J-RL, MD, PhD, involved in conceptualization, supervision, visualization, approval of the submitted and final versions. T-HY, MD, PhD, involved in data curation, resources, validation, visualization, approval of the submitted and final versions. Y-MC, MD, PhD, took part in conceptualization, data curation, formal analysis, funding acquisition, investigation, methodology, resources, visualization, writing—original draft, writing—review and editing, approval of the submitted and final versions. All authors have read approved the final submitted manuscript.

Corresponding author

Correspondence to Yong-Min Chun.

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Ethical approval

This study was approved by the Institutional Review Board for Severance Hospital at the Yonsei University College of Medicine (IRB No. 4-2021-1074).

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Our institutional review board approved this study after waiving the requirement for the informed consent.

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Kim, JH., Do, WS., Lim, JR. et al. Subscapularis tendon tears hidden by the medial biceps sling can be missed on arthroscopic examination. Arch Orthop Trauma Surg 143, 3251–3258 (2023). https://doi.org/10.1007/s00402-022-04681-1

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