Children with TD and Unaffected Shoulders
In adults, demonstration of greater strength in the more-versus less-preferred shoulder has been inconsistent, depending on the population and muscle tested.30–32 For instance, in a population of adults who did not play asymmetrical sports, shoulder adduction, extension, and internal rotation strength values were shown to be greater on the dominant side, but abduction and external rotation were greater on the nondominant side.32 In our study in children with TD, a significant asymmetry of approximately 10% in flexion and abduction was found, but no asymmetries were detected for external and internal rotation.