Study of the Biological Function of Muscle Satellite Cells From Patients With Obstetric Brachial Plexus Palsy

The purpose of this prospective work is to study the consequences of obstetrical brachial plexus paralysis on the rotator muscles of the shoulder. The hypothesis is that shoulder stiffness of these children is due to an impairment of the shoulder rotator muscles. The investigators want to test the regenerative capacities of these muscles. The development of a cellular model of this pathology will allow to test new therapeutic perspectives and to validate our hypothesis.