Muscle thickness of LT and SA in scapular dyskinesis
Alterations in scapular muscle function have been proposed to contribute to abnormal scapular motion and shoulder pain. MSK ultrasound has proved to be a useful tool to identify dysfunction of regional stabilizing muscle activity at rest and with contraction, in various musculoskeletal disorders.
The purpose of this study was to compare change in scapular muscle (lower trapezius and serratus anterior) thickness, measured with MSK ultrasound, between individuals with and without scapular dyskinesis.
The dyskinesis group demonstrated a greater increase (p = 0.005) in LT thickness with the isometric contraction than the group without (mean difference = 31.6%; 95%CI = 10.3, 53.0). No dif- ferences in SA or resting thickness of either muscle were found between groups. The presence of scapular dyskinesis alters thickness changes of the lower trapezius during activation. Furthermore, potential underlying reasons beyond muscle contractile behavior must be considered.
> From: Seitz et al., Manual Therapy (2015) (Epub ahead of print). All rights reserved to Elsevier Ltd.. Click here for the Pubmed summary.