Objective: The purpose of this study was to compare the scapular rotational movement measures between patients with Shoulder impingement syndrome and healthy persons during humeral elevation in scapular plane using Motion analyzer and Acromion cluster.

Mterials & Methods: Through a case-control study, 15 Patients (Males=7, Females=8) with Shoulder Impingement Syndrome (mean age= 46.6±14.242 years) and 13 healthy subjects (Male=7, Female=6 and mean age= 47.461±14.309 years) participated in this study. Subjects were asked to elevate humerous in scapular movement plane during 4 seconds with one-kilogram weight in hand, using the VICON motion analyzer and Acromion marker cluster. The marker set and kinematics analysis were based on ISB protocol.

Results: Data analysis demonstrated that Scapular rotational movement patterns were similar in both groups. The amount of upward rotation angle of scapula was significantly lower in patients group compared to healthy subjects (P=0.048).

Conclusion: These results suggest that altered scapular rotational movements may be an important aspect of scapulohumeral rhythm in the impingement syndrome and must be considered during assessment and treatment, specific in patients with shoulder pain.