title: Incidence of Patients With Knee Strain and Sprain Occurring at Sports or Recreation Venues and Presenting to United States Emergency Departments.
abstract: BACKGROUND
  Knee injuries account for a substantial percentage of all athletic injuries. The relative rates of knee injury for a variety of sports by sex and age need to be understood so we can better allocate resources, such as athletic trainers, to properly assess and treat injuries and reduce injury risk.
  
  
  OBJECTIVE
  To describe the epidemiology of patients with sport-related knee strain and sprain presenting to US emergency departments from 2002 to 2011.
  
  
  METHODS
  Cross-sectional study.
  
  
  METHODS
  Using the Consumer Products Safety Commission's National Electronic Injury Surveillance System and the US Census Bureau, we extracted raw data to estimate national rates of patients with knee strain and sprain presenting to emergency departments.
  
  
  METHODS
  Participants were individuals sustaining a knee strain or sprain at sports or recreation venues and presenting to local emergency departments for treatment. We included 12 popular sports for males and 11 for females. Ages were categorized in six 5-year increments for ages 5 to 34 years and one 10-year increment for ages 35 to 44 years.
  
  
  METHODS
  Incidence rates were calculated using weights provided by the National Electronic Injury Surveillance System and reported with their 95% confidence intervals for sport, sex, and age.
  
  
  RESULTS
  Strain and sprain injury rates varied greatly by sport, sex, and age group. The highest injury rates occurred in football and basketball for males and in soccer and basketball for females. The most at-risk population was 15 to 19 years for both sexes.
  
  
  CONCLUSIONS
  Athletes experience different rates of knee strain and sprain according to sport, sex, and age. Increased employment of athletic trainers to care for the highest-risk populations, aged 10 to 19 years, is recommended to reduce emergency department use and implement injury-prevention practices.
authors.affiliation: Department of Orthopaedic Surgery and Rehabilitation, University of Texas Medical Branch, Galveston.
authors.forename: Aaron M
authors.initials: AM
authors.lastname: Gray
authors.affiliation: Department of Orthopaedic Surgery and Rehabilitation, University of Texas Medical Branch, Galveston.
authors.forename: William L
authors.initials: WL
authors.lastname: Buford
mesh_terms: D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D056352:Athletes / Q000706:statistics & numerical data; D001265:Athletic Injuries / Q000453:epidemiology; D001490:Basketball / Q000293:injuries / Q000706:statistics & numerical data; D002648:Child; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data; D005260:Female; D005538:Football / Q000293:injuries / Q000706:statistics & numerical data; D006801:Humans; D015994:Incidence; D007718:Knee Injuries / Q000453:epidemiology*; D008297:Male; D011998:Recreation / Q000502:physiology; D012916:Soccer / Q000293:injuries / Q000706:statistics & numerical data; D013180:Sprains and Strains / Q000453:epidemiology*; D014481:United States / Q000453:epidemiology; D055815:Young Adult
keywords: athletic injuries; athletics; epidemiology; sex differences