Clinical Trial to Analyze Lateralized Models and Medializations of Inverted Arthroplasty.

The patient will be admitted to undergo reconstructive surgery of the arthropathy, by means of one of the two mentioned Inverted Arthroplasty implants. The patient will be operated following always the same surgical technique with the same protocol (position, anesthesia, antibiotic prophylaxis...) and by one of the three surgeons of the shoulder unit, being always at least two of them present in each of the interventions. Both the implants used and the complications occurring during surgery or in the immediate postoperative period will be recorded.