Rotator cuff tear and sarcopenia: are these related?

Background: Sarcopenia is the loss of muscle mass and consequent loss of muscle function with aging. Its prevalence among the general population is 12% to 30% in those aged >60 years. We evaluated (1) the difference in the prevalence of sarcopenia between patients with rotator cuff tear and controls and (2) the sarcopenia severity according to the size of the rotator cuff tear. Methods: Group 1 included 48 consecutive patients with chronic symptomatic full-thickness rotator cuff tears (mean +/- age, 60.1 +/- 6.5 years; range, 46-76 years), and group 2 included 48 age- and sex-matched patients. The sarcopenic index was evaluated by using the grip strength of the asymptomatic contralateral side and the skeletal muscle mass. Results: No significant differences were found in the baseline data and demographic factors between the groups. The sarcopenic index was significantly inferior in the rotator cuff tear group than in the age-and sex-matched control groups (P = .041, .007, and .05, respectively). Patients with large to massive tears had a significantly inferior sarcopenic index than those with small and medium tears. Conclusion: The results showed that sarcopenia was more severe in patients with a chronic symptomatic full-thickness rotator cuff tear than in the age-and sex-matched control population and was correlated with the size of the tear, with the numbers available. Despite the individual variance in the underlying medical condition and physical activities, this study suggests that clinicians should consider the sarcopenic condition of patients with a rotator cuff tear, especially in elderly patients with large to massive tears. (C) 2016 Journal of Shoulder and Elbow Surgery Board of Trustees. All rights reserved.