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Knee dislocation is a translocation of the tibia with respect to the femur following a violent trauma. It can be complicated by serious vasculo-nervous lesions, of which the paralysis of the sciatic nerve poplite external remains infrequent. This is the case of our patient who presented six months ago a traumatic dislocation of the left knee reduced in urgency, And which was complicated by a complete neurological deficit of the SPE nerve, confirmed by electromyogram (EMG). Palliative surgery was indicated and was aimed at improving functional prognosis, using tendon transfer to resuscitate the dorsal flexion of the foot.

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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.