Investigation of Posterior Shoulder Tightness on Scapular Dyskinesis

Abstract

Purpose: It has been theorized that posterior shoulder tightness may contribute to scapular dyskinesis; however, it is not yet clear. The aim of the study was to investigate the association between posterior shoulder tightness and scapular dyskinesis in asymptomatic individuals. Methods: This was a cross-sectional study including 121 male participants 242 shoulders . Scapular dyskinesis was identified by the Scapular Dyskinesis Test, and the participants were grouped as ‘dyskinesis’ and ‘no dyskinesis’ on the dominant and non-dominant sides. Posterior shoulder tightness was assessed by measuring glenohumeral horizontal adduction. Results: Dyskinesis was detected in 67.8% of participants. The mean angles of posterior shoulder tightness in individuals with and without dyskinesis on the dominant side were 35.23 SD 7.50 and 35.43 SD 8.17 degrees, respectively. On the non-dominant side, the mean angles of posterior shoulder tightness were 39.26 SD 8.70 and 38.41 SD 8.50 degrees in individuals with and without dyskinesis, respectively. There was no statistically significant difference in posterior shoulder tightness between the groups p>0.05 . Conclusion: The findings of the study showed that there was no association between posterior shoulder tightness and scapular dyskinesis in asymptomatic individuals.