We carried out a survey of lower extremity injuries in runners living in Saiki city and its environs. The mean age of subjects was 38.8 years, the mean number of years running 13 years, and mean monthly mileage 224km. We obtained information by means of questionnaires, measuring alignment in the lower extremity and muscular strength.23 runners had experience of running injuries and many had hsd Achilles tendinitis. Injured runners differed significantly from noninjured runners in that they were more likely to have run more miles per week, run at a faster pace, and been running for more years. With respect to malalignment of the lower extremity 8 runners demonstrated genu varum and 5 runners flat foot.No specific malalignment correlated with any specific injury. There was no statistical difference in muscular strength between injured runners and noninjured runners. There may be a positive association between running injury and training errors.