Fifty patients with stress fractures occurring during sports activities were treated between 1989 and 1996. We assessed the sites of injury, sports specificity, relationship between sites and sports, the month of injury and the interval between the cessation of sports activities and the disappearance of symptoms. The predominant sites were tibia (48%), metatarsal bone (18%) and ribs (14%). Running was the major associated sport. 48% of patients were injured between April and June. The mean period until disappearance of symptoms was 9.1 weeks in the tibia, 6.7 weeks in the metatarsal bone and 6.4 weeks in ribs.