Lower limb injuries are commonly sustained in automobile crashes. These injuries are oñen debilitating and expensive to treat. Although they have been studied extensively, lower limb injury mechanisms are poorly understood due to the numerous factors that must be considered as causes. Many of these factors are related to the type of vehicle and the severity of the crash. Recent studies suggest that occupantrelated factors such as age, gender, preimpact bracing, and anthropometry may also influence the risk of lower limb injuries. Each of these factors is discussed in this paper. Crash data base ñles, experimental studies, and published literature are examined to discern their relative importance in producing lower limb injuries.