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The objective of this study is to assess the interest and the efficiency of virtual reality in functional rehabilitation of shoulder pain and shoulder injuries. Participants will follow a 12-week rehabilitation program based either on exercises or on a program integrating virtual reality. Results obtained with classical rehabilitation will be compared with the one obtained virtual reality.

Fifty people will be included in the study. Then, they were randomly separated in two groups : 25 people will do the "classical rehabilitation" and the other 25 will have a treatment with virtual reality.

Each group (virtual reality and "classical rehabilitation") is going to follow 12 weeks of rehabilitation, at a rate of 2x 30 minutes per week. In "virtual reality group", each session will be divided in two parts : 15 minutes of virtual reality exercises and 15 minutes of exercises from "classical program". Exercises suggested in the classical program have been chosen among evidence based exercises described in literature.

Before the beginning of rehabilitation sessions, participants will be assessed at the Laboratory of Human Motion Analysis of the University of Liege. At this place, EMG activity of periscapular muscles (upper trapezius, lower trapezius and serratus anterior) (Delsys Trigno) , 3D scapular kinematics (Codamotion) will be assessed on the painful side when doing shoulder elevations in sagittal and in frontal planes. Maximum isometric strength will also be assessed using handheld dynamometer (MicroFet2) in 3 different positions (SeatedU90°, SeatedU125°, Prone-v-thumbs up)

This first evaluation will be done after the 12 week of rehabilitation too, with the same method.

Participants will also have to complete Dash (Disability of the Arm, Shoulder and Hand) questionnaire 3 times during the study (at the beginning, at 6 weeks and at the end of the study). Moreover, pain score will be asked to participants at each rehabilitation session.

Inclusion criteria:

• unilateral scapular dyskinesis
• positive scapular assistance test and positive resistance test
• shoulder pain
• ability to play sport despite shoulder pain
• one or more positive tendinous tests

Exclusion criteria :

• traumatic history of shoulder injury in the last 6 months
• surgical history at shoulder or cervical location
• scoliosis