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Related Experiment Video

Updated: Jun 27, 2026

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Type III Sugaya Classification after Rotator Cuff Repair: Preoperative Risk Factors and Progression to Retear.

Soo-Young Jeong1, Ki Won Young1, Tae Kang Lim1

  • 1Department of Orthopedic Surgery, Nowon Eulji Medical Center, Eulji University School of Medicine, Seoul, Korea.

Clinics in Orthopedic Surgery
|April 6, 2026
PubMed
Summary

Sugaya type III rotator cuff repairs indicate poorer infraspinatus muscle quality and a higher retear risk compared to Sugaya types I/II. This classification highlights potential long-term healing differences after rotator cuff repair.

Keywords:
Magnetic resonance imageRetearRotator cuffSugaya classificationUltrasonography

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Area of Science:

  • Orthopedic Surgery
  • Musculoskeletal Imaging
  • Sports Medicine

Background:

  • The Sugaya classification assesses rotator cuff tendon integrity post-repair.
  • Sugaya type III has limited research regarding preoperative factors and long-term outcomes.
  • Clarifying Sugaya type III's status as healed or retorn is crucial.

Purpose of the Study:

  • Evaluate preoperative risk factors for Sugaya type III rotator cuff repair.
  • Assess the longitudinal outcomes of Sugaya type III repairs.
  • Hypothesize association with tear severity and higher retear risk.

Main Methods:

  • Retrospective study of 124 arthroscopic rotator cuff repairs.
  • MRI at 6 months (Sugaya classification) and ultrasound at final follow-up.
  • Comparison of preoperative data, clinical scores, and ultrasound results between Sugaya types I/II and III.

Main Results:

  • Sugaya type III occurred in 27% of patients at 6 months post-surgery.
  • Late retears were significantly higher in Sugaya type III (12.1%) vs. I/II (1.3%) (p=0.014).
  • Infraspinatus fatty infiltration was the sole predictor of Sugaya type III (p=0.005).

Conclusions:

  • Postoperative Sugaya type III is linked to preoperative infraspinatus muscle quality.
  • Sugaya type III repairs face a greater risk of subsequent retears.
  • This classification aids in understanding rotator cuff repair healing and prognosis.