In a study of ski injuries in Sapporo during 1979 through 1984, information regarding 1276 ski injuries was obtained. Children ages 6 to 12 accounted for 40% of all injuries observed. The most common injuries were fractures and sprains in the case of children, sprains in adolescents, lacerations in male adults, and sprains in female adults. The injuries were seen mostly after 1 or 2 h of skiing among intermediate skiers and when the skier fell forward. The slopes and soft snow condition were also significant injury factors. The most important factor was whether or not the bindings released on impact. Fractures and sprains occurred without the release of bindings, while lacerations occurred with the release of bindings. Tibia fractures occurred as a spiral fracture in children and tended to occur as oblique fractures at the distal one-third in adults. In knee sprains, Grade I injuries accounted for 70% and Grade II injuries accounted for about 30% in any age group.