The purpuse of this study is to asses if the pulsed radiofrecuency of the supraescapular nerve and accesory nerve have the same or superior efectivity controlling the acute postoperative pain than interscalenic braquial plexus block

This is a randomized, double-blind trial that compares the effect in postoperative pain of pulsed radiofrecuency of the supraescapular nerve carried out at least two to four weeks before reverse total shoulder arthroplasty surgery with interscalenic braquial plexus block done at the moment of the surgery. All the patients received conventional general anaesthesia and multimodal postoperative analgesia with additional patient-controlled rescue analgesics were prescribed

Inclusion criteria:

• Over 18 y.o.
• Cronic pain (more than 3 months) due to rotator cuff arthropathy
• VAS higher than 4
• Decrease Constant score
• Conservative treatment (physiotherapy and NSAIs) unsuccessful

Exclusion criteria:

• psychiatric illness
• drug abuse.
• previous surgeries.
• acute traumatic pathology or ethiology different from rotator cuff arthropathy
• pacemaker
• infectious process

Double blind trial