Traumatic injuries such as hand injuries are caused by mechanical causes of bone, muscle or tissue damage, from severed fingers, fractures to minor skin injuries and so on. Such as the use of sharp-edged tools, the manipulation of some large knives, sharp machines or instruments, can cause hand cuts and so on; handling, the use of spindles, nails, screwdrivers, chisels, Sprained into the machinery will be sprained, crushed and even rolled off your fingers.