16 adults with shoulder impingement signs (mean age 22 +or-1.6 years) underwent the intervention and 16 healthy participants (24.8 + or -3.1years) provided reference data. Shoulder function and pain were assessed using the Shoulder Pain and Disability Index (SPADI) and other questionnaires. Electromyography (EMG) and 3- dimensional motion analysis was used to record muscle activation and kinematic data during arm elevation to 90 degrees and lowering in 3 planes. Patients were assessed pre and post a 10-week motor control-based intervention, utilizing scapular orientation retraining. Pre-intervention, patients reported pain and reduced function compared to the healthy participants. Post-intervention, the SPADI scores reduced significantly by a mean of 10 points. EMG showed delayed onset and early termination of serratus anterior and lower trapezius muscle activity pre-intervention, which improved significantly post- intervention. Pre-intervention, patients exhibited on average 4.6-7.4 degrees less posterior tilt, which was significantly lower in 2 arm elevation planes than healthy participants. Postintervention, upward rotation and posterior tilt increased significantly during 2 arm movements, approaching the healthy values.