| Objective: Knowledge of the kinematics and associated muscular activity in individuals with different types of scapular dyskinesis(SD) may provide insight into the SD in injury mechanism and get a more efficient way to prevent and treat diseases. We investigated the surface electromyography(s EMG) characteristics of the periscapular muscle activation from patients with different types of SD.Methods: To test the maximum of muscle activation on both sides of 11 health adults with symmetrical scapula(control group) and 29 SD patients(SD group), including Kibler's Type I, Type II, Type III during the arm flexion and abduction, and make the absolute value(|?|) of control group's D-value as a reference, then observe the number of muscle activity increasing or decreasing in different SD groups(compared with the contralateral side).Results: Increaser UT activity in type I, II, III subjects and IF activity in type II subjects were found(P<0.05), and decreaser MT activity in type II subjects and AD activity in type III subjects was found during the arm flexion(P<0.05). In addition, decreaser LT/SA/AD activity in type I subjects and LT/MT/AD/PD activity in type II subjects and AD activity in type III subjects were found(P<0.05), and increaser UT activity in type III subjects during the arm abduction(P<0.05).Conclusions: Type I dyskinesis is prominence of the inferior medial scapular angle,relating to the decreasion of Serratus anterior and Lower trapezius activation; Type II dyskinesis is prominence of the entire medial border of the scapula, relating to the decreasion of Middle and Lower trapezius activation; Type III dyskinesis is elevation of the superior border of the scapula, relating to the increasion of Upper trapezius.Secondly, scapular dyskinesis may be related to the decreasion of Anterior deltoid and Posterior deltoid activation and the increasion of Infraspinatus activation. |
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