Most symptomatic large-to-massiverotator cuff tears (RCTs) should be operated, but the prognosis and postoperative risk of re-tear depended on the quality of rotator cuff muscles. Preoperative evaluations were usually done by magnetic resonance imaging (MRI). MRI was used in recent studies to predict the surgical outcome of large-to-massive RCTs and postoperative re-tear, but the clinical availability was not as good as ultrasound. The investigators hypothesize that ultrasound elastography can predict the prognosis of large-to-massive RCTs and risk of re-tear.
To predict the prognosis of large-to-massive RCTs and risk of re-tear by ultrasound elastography.