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Updated: Jul 22, 2026

Development of a Rabbit Chronic-Like Rotator Cuff Injury Model for Study of Fibrosis and Muscular Fatty Degeneration
Published on: March 31, 2023
Tendon stump change as a risk factor for structural failure of arthroscopic rotator cuff repair
Jun Kawamata1,2, Shoji Fukuta1, Masashi Kano2
1Department of Orthopaedic Surgery, NHO Kochi National Hospital, Kochi, Japan.
Background:
This study aimed to identify risk factors for retear after arthroscopic rotator cuff repair (ARCR) using the suture bridge method and to assess the relation between preoperative and postoperative tendon condition and retear.
Methods:
We retrospectively analyzed patients who underwent ARCR for a medium tear. Potential risk factors, including tear width, anteroposterior and medial-lateral tear width, atrophy, fatty degeneration, and condition of the tendon stump (Ishitani's classification and rotator cuff/deltoid muscle [C/D] ratio), were identified on magnetic resonance preoperatively. Magnetic resonance imaging was performed regularly after surgery, and the C/D ratio in the sutured cuff was evaluated. Shoulders that were Sugaya type I-III were classified as the repair group and those that were type IV or V as the retear group. Risk factors for retear were analyzed by univariable and multivariable analyses.
Results:
We analyzed 175 patients in 183 shoulders. The overall retear rate was 13.1%. Multivariable analysis revealed medial-lateral width (odds ratio: 0.88; 95% confidence interval: 0.82-0.95; P < .001) and C/D ratio (odds ratio: 0.30; 95% confidence interval: 0.16-0.58; P < .001) as independent risk factors for retear. At 3 weeks postoperatively, the C/D ratio was significantly higher in the retear group (1.70 ± 1.47 vs. 0.84 ± 0.72; P = .002).
Conclusions:
The C/D ratio and tear width were risk factors for retear after ARCR using the suture bridge method. The C/D ratio was higher in retear cases both preoperatively and postoperatively.
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