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00005768-200305001-0185900005768_2003_35_s335_haapasalo_prospective_5miscellaneous< 17_0_5_0 >Medicine & Science in Sports & Exercise©2003The American College of Sports MedicineVolume 35(5) Supplement 1May 2003p S335PROSPECTIVE ONE‐YEAR FOLLOW‐UP OF KNEE INJURIES IN LEISURE‐TIME PHYSICAL ACTIVITIES[G-15O FREE COMMUNICATION/POSTER EPIDEMIOLOGY]Haapasalo, H1; Parkkari, J1; Kannus, P1; Natri, A1; Järvinen, M11Tampere Research Center of Sports Medicine; UKK Institute; and Tampere University Medical School, Department of Surgery, Tampere, FinlandPURPOSETo compare the risks of knee injuries in various commuting and lifestyle activities as well as in recreational and competitive sports in 15-to74-year-old Finnish population.METHODS3 657 subjects were randomly selected from the nationwide population register of Finland. The subjects recorded all their physical activities that lasted over 15 minutes and registered all injuries that were sustained in these activities. The subjects were interviewed three times by telephone during the follow-up year. The knee injury risk per 1000 exposure hours was calculated for each activity. The effect of age and sex on the injury risk was also evaluated.RESULTSFifteen percent of all reported injuries in the cohort (n=321) affected the knee. The risk of knee injury per 1000 exposure hours was 0.44 (95% CI 0.39 to 0.50) in recreational and competitive sports, 0.06 (95% CI 0.04 to 0.09) in commuting activities, and 0.04 (95% CI 0.03 to 0.06) in lifestyle activities. The highest knee injury incidence rates were seen in squash (5.4), judo (2.2), rinkball (2.1), floorball (2.0), wrestling (1.8), volleyball (1.4), skating (1.1), soccer (1.1), ice hockey (1.1) and track and field sports (1.1). In commuting (p = 0.046) and lifestyle (p = 0.038) activities the risk of knee injuries significantly increased with age. In recreational and competitive sports, in turn, the knee injury incidence significantly decreased with age (p < 0.001). In commuting activities (Hazard Ratio, HR= 5.99), endurance sports (1.40), and power and contact sports (2.10) the risk of knee injury was higher in women than in men.CONCLUSIONThe risk of knee injury is almost ten times higher in recreational and competitive sports than in commuting or lifestyle activities. The knee injury rates are high especially in various team sports and ball games. Large absolute number of knee injuries occurs during low-to-moderate intensity activities indicating that preventive efforts are needed also among less-demanding activities.PROSPECTIVE ONE‐YEAR FOLLOW‐UP OF KNEE INJURIES IN LEISURE‐TIME PHYSICAL ACTIVITIESHaapasalo, H; Parkkari, J; Kannus, P; Natri, A; Järvinen, MG-15O Free Communication/Poster Epidemiology535