This document discusses vascular injuries, their causes, signs, investigations, and principles of management. It focuses on surgical repair techniques including preparing the limb, assessing and trimming the injured vessel, thrombectomy, and using a reverse saphenous vein graft or direct approximation when possible. It also addresses venous injuries, combined vascular and skeletal trauma, and the role of primary amputation in extensive crush injuries. The overall aim is to resuscitate the patient, repair the injury as soon as possible with or without fasciotomy or external fixation, provide post-operative monitoring, and enable rehabilitation.