The hand is anatomically complex. Having an anatomical-based approach to the assessment of patients who present to the Emergency Department is important to preserve quality of life following a hand injury. Hand injuries are the second most common injury leading to days without work. It is no surprise then that open finger injuries land in the top 10 most common diagnoses that end up in court. In this first part of our two-part series on hand injuries Dr. Matt Distefano and Dr. Arun Sayal guide us through the principles and pitfalls of assessment and management of hand injuries and answer questions such as: what is the differential diagnosis of a globally swollen hand? What is the intrinsic minus hand position? When should we suspect compartment syndrome of the hand? How should we best locate retracted lacerated tendons of the hand? What are the best ways to control bleeding of a finger tip amputation? What are the best analgesic choices? How large of a skin avulsion hand injury should we let heal by secondary intention rather than recommend a flap/skin graft? and many more...