Retear Rate Between 1 and 2 Years Postoperatively After Arthroscopic Rotator Cuff Repair Is Over 30% and Associated With Higher Tear Size and Fatty Degeneration.

Purpose: The purpose of this study was to evaluate the integrity of the repaired rotator cuff between 1 and 2 years postoperatively after arthroscopic rotator cuff repair (ARCR) using magnetic resonance imaging (MRI), investigate the factors affecting its change, and assess the association between the change and postoperative clinical outcomes.

Methods: Rotator cuff tear patients who underwent ARCR and were evaluated by MRI before surgery, and 1 and 2 years after ARCR with a minimum of 2-year follow-up were included in this study. Repair integrity was evaluated using Sugaya's classification, and according to the classification types IV and V were defined as retears.

Influence of a nerve injury proximal to the suprascapular nerve on healing of repaired rotator cuff tear.

Background: Massive rotator cuff tears have a high rate of re-injury because of severe fatty infiltration. Our data showed that injuries proximal to the suprascapular nerve may be one cause of massive rotator cuff tears. The purpose of this study was to evaluate, using a rat model, how brachial plexus injury associated with a massive rotator cuff tear influences healing of the rotator cuff repair.

Assessment of pain-related behavior and pro-inflammatory cytokine levels in the rat rotator cuff tear model.

The cause of pain following rotator cuff tear has not been fully elucidated. The purpose of this study was to evaluate behavior and inflammatory cytokines in a rat unstabilized rotator cuff defect (UCD) model. Forty-five Sprague-Dawley rats were divided into three groups: sham; UCD; and stabilized rotator cuff defect (SCD).