The compression of the nerve is a known pathology since the late fifties, described for the first time par Thompson & Kopell. Many etiologies have been described, including traumatic aetiology further to a fracture of the scapula by bullet wound, which is never reported in the literature and falls within the framework of a syndrome of trapping. The identification of the NSS lesion requires not only careful clinical examination of the shoulder, but also a detailed neurophysiological evaluation, possibly using imagery.Diagnosis and treatment of this compression should be as early as possible, before the installation of irreversible amyotrophy. The surgery of different causes of compression has improved the functional prognosis of the injured shoulder.