Principally, there are three mechanisms of tissue damage due to bullets: laceration and crushing, shock waves, and cavitation. Laceration and crushing are generated by the projectile displacing the tissues in its track and are recognized as the primary wounding mechanism produced by handguns The degree and amount of laceration and crushing are dependent upon projectile velocity, shape, angle of impact, yaw, and tumbling. Shock waves, the second mechanism often cited as significant in wounding, occur by the compression of tissues that lay ahead of the bullet, are generated by high velocity projectile generally exceeding 2,500 feet per second. A projectile´s ability to produce a temporary cavity is considered an important component in wound production and degree of destruction. Most researchers agree that the wounding effect of the cavitation phenomenon is only significant in velocities surpassing 1,000 feet per second. When a projectile enters the body, the kinetic energy imparted on the surrounding tissues forces them forward and radically producing a temporary cavity or temporary displacement of tissues. The temporary cavity may be considerably larger than the diameter of the bullet, and rarely lasts longer than a few milliseconds before collapsing into the permanent cavity or wound (bullet) track. The permanent cavity, or wound track, is the defect generated when the tissues in the projectile´s path are expelled from the body. The cavitation phenomenon has been used to explain the fracturing of bone not in the direct path of a projectile.