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. The engineer who will carry out the test measures the size of his lower limbs.