Reportage on the Rossetti health centre in Nice, France. This rehabilitation centre is a hub of excellence with cutting-edge technology. Seen here, a quantified motion analysis test carried out in the Clinical Motion Analysis Unit, a technical platform enabling a better understanding of walking anomalies. This 15-year old boy suffers from cerebal palsy, is mentally and physically retarded and has orthopedic disorders. A physiotherapist who evaluates his muscle range, spasticity and strength before the test examines him.