OBJECTIVE: To investigate the effects of two different exercise programs on three-dimensional scapular kinematics, disability, and pain in participants with subacromial impingement syndrome (SIS). DESIGN: Randomized controlled trial. SETTING: Outpatient clinic and research laboratory. PARTICIPANTS: Thirty participants who were diagnosed with SIS and who also exhibited scapular dyskinesis. INTERVENTIONS: The participants were randomized in two different exercise groups: (1) shoulder girdle stretching and strengthening with additional scapular stabilization exercises based on a kinetic chain approach (intervention group), and (2) shoulder girdle stretching and strengthening exercises only (control group). MAIN OUTCOME MEASURES: Three-dimensional scapular kinematics, self-reported shoulder pain, and disability were evaluated at baseline, after 6 weeks of training, and after 12 weeks of training. RESULTS: Significant differences were observed between the control and intervention group in external rotation and posterior tilt after 6 weeks of training and in external rotation, posterior tilt, and upward rotation after 12 weeks of training. All groups showed improvement in self-reported pain and disability scores, however there were no significant differences between the groups. CONCLUSION: Progressive exercise training independent from specific scapular stabilization exercises provides decreased disability and pain severity in impingement syndrome.

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