Examining the Relationship Between Sarcopenia and Rotator Cuff Tears: A Retrospective Comparative Study.

: With the rapid increase in the aging population, the number of patients complaining of shoulder pain is also increasing. Among shoulder ailments, rotator cuff tears (RCTs) are most frequently observed in middle-aged and elderly individuals. Sarcopenia refers to the decline in muscle mass (lean body mass) and the subsequent decrease in muscle function that is linked to the natural aging process. To the best of our knowledge, there is currently limited information available regarding the association between RCTs and sarcopenia. The study included only individuals who had undergone dual-energy X-ray absorptiometry and body composition assessments. After applying the exclusion criteria, the participants were divided into sarcopenia and non-sarcopenia groups by the body composition tests. Next, those diagnosed with RCTs were assigned to the experimental group, and those without RCTs were assigned to the control group. The matching was performed using propensity score matching. Sarcopenia was defined as a skeletal muscle index lower than 7.0 kg/m in males and 5.4 kg/m in females. Multivariable logistic regression with backward elimination was performed. After propensity score matching, there were no significant differences in age, sex, and bone mineral density between the RCT and control groups. In the univariate analysis, it was observed that most of the baseline data and demographic factors did not exhibit significant differences, except for calcium levels and the presence of chronic kidney injury. According to the multivariable logistic regression analysis of factors related to RCTs, sarcopenia was unrelated to RCTs, but chronic kidney injury and Ca levels were significantly associated. Also, there was also no significant association between sarcopenia and RCT size and severity. In conclusion, we cannot find a significant relationship between sarcopenia and RCTs.