Background: Forward head and round shoulder posture (FHRSP) is believed to be related to scapular dyskinesis (SD) placing increased stress on the neck and shoulder, leading to pain and dysfunction. Therefore, a clinical method with sufficient reliability to distinguish normal and abnormal scapular position and motion among people with FHRSP are needed. The study aims to evaluate intrarater and interrater reliability and agreement of the scapular dyskinesis test (SDT) in people with FHRSP.
Methodsː This reliability study included 60 young men who were identified as having FHRSP as measured by photogrammetry method. The clinical examination included a Scapular Dyskinesis Test (SDT) assessment which was performed by two raters who were blinded to their mutual test results during two different days. Intra- and interrater reliabilities were determined using the Kappa coefficient with linear weighting for the ordinal classification of SD by SDT.
Results: Interrater agreement values ranging from 90.8% to 92.1%. Furthermore, the interrater reliabilities were presented almost perfect reliability (k > 0.82). For intrarater agreement, raters presented high percentage values of agreement between the two measurements (88.9% to 92.5%). Intrarater reliability for raters was substantial to almost perfect (k >0.77).
Conclusion: The intra- and interrater reliability and agreement of the SDT obtained by two raters was substantial to almost perfect among young men with FHRSP. Therefore, it seems that SDT is a simple method to distinguish normal and abnormal scapular position and motion in order to screen or assess before developing prevention programs.