When the patient agree to participate and signed informed consent, the investigators collected dependent variables considered (symptoms, mechanosensitivity, functional capacity with upper limb, tractor speed of neural conduction ...) and the patient is assigned to an intervention group: real or placebo. Each patient receives treatment 5 sessions trascurriendo intersessional 2- 5 days. After 5 sessions the investigators remeasured the same variables. In addition, a month later they remeasured again symptoms and functional capacity with upper limb. Finally, they were shown the technique they have received. If the patient has received the technical placebo he/she is given the opportunity to receive 5 sessions of the actual technique.