Evaluation of the Relationship Between Scapular Dyskinesis and Acromiohumeral Distance

Abstract

This study analyzed the interaction between scapular dyskinesis (SDK) and acromiohumeral distance (AHD). Diagnostic ultrasound (DUS) was used to measure the AHD of 33 participants between 10 and 120o of weighted arm elevation in the scapular and frontal planes. Images were collected every 10o as the participant raised and held the weight at each increment. This process was completed bilaterally prior to completion of the Scapular Dyskinesis Test (SDT) to diagnose the presence of SDK. Intra-rater reliability was assessed with ICC (3,1) and four multilinear regressions were used to evaluate the relationship between AHD and SDK. Results indicated nearly perfect inter-rater reliability and a significant, positive relationship between AHD and SDK of the non-dominant arm in the scapular and frontal plane of movement.