Arthroscopic reduction of a chronically dislocated reversed shoulder arthroplasty.

We present the case of a 64-year-old female patient who had a traumatic dislocation of a reversed shoulder arthroplasty that was unnoticed for 5 weeks and that was reduced arthroscopically. Arthroscopy of the shoulder, as in other joints with prostheses, can facilitate the treatment of conditions that would otherwise require the use of open surgery to solve them and that might become more frequent because of the widespread use of reversed shoulder arthroplasties, which have a high rate of dislocation.