The mechanism of the injury determines the likelihood of disruption to underlying tissue, the risk of a retained foreign body, and the degree of potential contamination. The following circumstances are associated with specific pathogens: (a) farming accidents (Clostridium perfringens), (b) wading in a freshwater stream (Aeromonas hydrophila), and (c) high-pressure water systems used for cleaning surfaces (Acinetobacter calcoaceticus). Evaluation of wounds in general is discussed in Chapter 9. It is important to determine the position of the limb at the time of injury, which will help to uncover occult tendon injuries.