Knee Surgery, Sports Traumatology, Arthroscopy

, Volume 25, Issue 7, pp 2129–2137 | Cite as

Arthroscopic modified Mason-Allen technique for large U- or L-shaped rotator cuff tears

  • Sung-Weon JungEmail author
  • Dong-Hee Kim
  • Seung-Hoon Kang
  • Ji-Heon Lee



While a conventional single- or double-row repair technique could be applied for repair of C-shaped tears, a different surgical strategy should be considered for repair of U- or L-shaped tears because they typically have complex patterns with anterior, posterior, or both mobile leaves. This study was performed to examine the outcomes of the modified Mason-Allen technique for footprint restoration in the treatment of large U- or L-shaped rotator cuff tears.


Thirty-two patients who underwent an arthroscopic modified Mason-Allen technique for large U- or L-shaped rotator cuff tears between January 2012 and December 2013 were included in this study. Margin convergence was first performed to reduce the tear gap and tension, and then, an arthroscopic Mason-Allen technique was performed to restore the rotator cuff footprint in a side-to-end repair fashion. All patients were evaluated preoperatively and for a minimum of 2 years of follow-up with a visual analog scale (VAS) for pain, Constant score, and ultrasonography.


There was significant improvement in all VAS and Constant scores compared with the preoperative values (P < 0.001). Functional results by Constant scores included 9 cases that were classified as excellent, 11 cases as good, 8 cases as fair, and 2 cases as poor. Binary logistic regression analysis revealed that heavy work, pseudoparalysis, joint space narrowing, fatty degeneration of the SST and IST, and a positive tangent sign were found to significantly correlate with functional outcomes. Multivariable logistic regression analysis revealed that only fatty degeneration of the SST was a risk factor for fair/poor clinical outcomes. Complications occurred in 5 of the 32 patients (15.6 %), and the reoperation rate due to complications was 6.3 % (2 of 32 patients).


An arthroscopic modified Mason-Allen technique was sufficient to restore the footprint of the rotator cuff in our data. Overall satisfactory results were achieved in most patients, with the exception of those with severe fatty degeneration. An arthroscopic modified Mason-Allen technique could be an effective and reliable alternative for patients with large U- or L-shaped rotator cuff tears.

Level of evidence

Case Series, Therapeutic Level IV.


Rotator cuff tear Large size Mason-Allen technique Margin convergence Shoulder 



This study was approved by the IRB committee of Samsung Medical Center.

Compliance with ethical standards

Conflict of interest

No benefits in any form have been received or will be received from a commercial party related directly or indirectly to the subject of this article.

Supplementary material

Supplementary material 1 (AVI 9669 kb)


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Copyright information

© European Society of Sports Traumatology, Knee Surgery, Arthroscopy (ESSKA) 2016

Authors and Affiliations

  • Sung-Weon Jung
    • 1
    Email author
  • Dong-Hee Kim
    • 1
  • Seung-Hoon Kang
    • 1
  • Ji-Heon Lee
    • 1
  1. 1.Department of Orthopedic Surgery, Samsung Changwon HospitalSungkyunkwan University School of MedicineChangwon-siKorea

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