Study: Single-Sport Athletes Injured More
November 3, 2016
A study conducted by the University of Wisconsin School of Medicine and Public Health and funded by the National Federation of State High School Associations (NFHS) Foundation revealed that high school athletes who specialize in a single sport sustain lower-extremity injuries at significantly higher rates than athletes who do not specialize in one sport.
The study was conducted throughout the 2015-16 school year at 29 high schools in Wisconsin involving more than 1,500 student-athletes equally divided between male and female participants. The schools involved in the study represented a mixture of rural (14), suburban (12) and urban (3) areas, and enrollments were equally diverse with 10 small schools (less than 500 students), 10 medium schools (501-1,000 students) and nine large schools (more than 1,000 students).
Athletes who specialized in one sport were twice as likely to report previously sustaining a lower-extremity injury while participating in sports (46%) than athletes who did not specialize (24%). In addition, specialized athletes sustained 60 percent more new lower-extremity injuries during the study than athletes who did not specialize. Lower-extremity injuries were defined as any acute, gradual, recurrent or repetitive-use injury to the lower musculoskeletal system.
“While we have long believed that sport specialization by high school athletes leads to an increased risk of overuse injury, this study confirms those beliefs about the potential risks of sport specialization,” said Bob Gardner, NFHS executive director. “Coaches, parents and student-athletes need to be aware of the injury risks involved with an overemphasis in a single sport.”
Among those who reported previously sustaining a lower-extremity injury, the areas of the body injured most often were the ankle (43%) and knee (23%). The most common types of previous injuries were ligament sprains (51%) and muscle/tendon strains (20%).
New injuries during the year-long study occurred most often to the ankle (34%), knee (25%) and upper leg (13%), with the most common injuries being ligament sprains (41%), muscle/tendon strains (25%) and tendonitis (20%).
In addition, specialized athletes were twice as likely to sustain a gradual onset/repetitive-use injury than athletes who did not specialize, and those who specialized were more likely to sustain an injury even when controlling for gender, grade, previous injury status and sport.
Thirty-four (34) percent of the student-athletes involved in the Wisconsin study specialized in one sport, with females (41%) more likely to specialize than males (28%). Soccer had the highest level of specialization for both males (45%) and females (49%). After soccer, the rate of specialization for females was highest for softball (45%), volleyball (43%) and basketball (37%). The top specialization sports for males after soccer were basketball (37%), tennis (33%) and wrestling (29%).
The study, which was directed by Timothy McGuine, Ph.D., ATC, of the University of Wisconsin, also documented the effects of concurrent sport participation (participating in an interscholastic sport while simultaneously participating in an out-of-school club sport), which indicated further risk of athletes sustaining lower-extremity injuries.
Almost 50 percent of the student-athletes involved in the survey indicated they participated on a club team outside the school setting, and 15 percent of those individuals did so while simultaneously competing in a different sport within the school. Seventeen (17) percent of the student-athletes indicated that they took part in 60 or more primary sport competitions (school and club) in a single year. Among those student-athletes in this group who sustained new lower-extremity injuries during the year, 27 percent were athletes who specialized in one sport.
The student-athletes involved in the study were deemed “specialized” if they answered “yes” to at least four of the following six questions: 1) Do you train more than 75 percent of the time in your primary sport?; 2) Do you train to improve skill and miss time with friends as a result?; 3) Have you quit another sport to focus on one sport?; 4) Do you consider your primary sport more important than your other sports?; 5) Do you regularly travel out of state for your primary sport?; 6) Do you train more than eight months a year in your primary sport?
Although some sports (field hockey, lacrosse) are not offered in Wisconsin and were not included in the study, the study concluded that since specialization increased the risk of lower-extremity injuries in sports involved in the survey it would also likely increase the risk of injuries in sports that were not a part of the study.
Council Discusses Transfer, 5th-Quarter Rules in Charting Future Work During Fall Meeting
By
Geoff Kimmerly
MHSAA.com senior editor
December 18, 2025
The Representative Council of the Michigan High School Athletic Association considered several reports concerning ongoing business relevant to its member schools, discussed topics surrounding the MHSAA’s transfer and 5th-quarter rules, and conducted its annual elections among other activities during its Fall Meeting on Dec. 5 in East Lansing.
Generally, the Council takes only a few actions during its Fall Meeting, with topics often introduced for additional consideration and action during its meetings in March and May. The Council took only one action at this meeting, to approve its annual audit, but discussed several topics that will be delved into further throughout the remainder of this school year.
A significant portion of Council discussion regarded the MHSAA transfer and 5th-quarter allowance rules. The transfer conversation focused primarily on students who play as part of non-MHSAA sports organizations during their first year or years of high school but wish to then play at a member high school. The Council also received an update on the Transfer Tracker tool under development that will provide schools greater guidance on eligibility determinations by monitoring when students change schools after ninth grade.
The 5th-quarter conversation considered how allowances made in recent years in basketball, football, soccer, lacrosse, baseball and field hockey have aligned with the intent of that allowance – to help schools save subvarsity teams from elimination because of low participation by allowing athletes to play on varsity and subvarsity teams simultaneously over a set number of periods each week.
The Council received updates on this fall’s inaugural MHSAA Field Hockey Tournament and also on the first boys volleyball season to be played during Spring 2026. MHSAA staff also informed the Council on a baseball rule proposal that would require a double first base, recent viewership of NFHS Network broadcasts, and MHSAA Sports Medicine Advisory Committee discussions especially concerning the statewide shortage of athletic trainers in schools. Additional updates were provided on MHSAA athletic director Update meeting and in-service programs and other administrative topics.
The Fall Meeting also saw elections of Council officers for the upcoming year. Brighton athletic director John Thompson was reelected president after completing the previous president’s term this summer and fall. Calumet teacher and past athletic director Sean Jacques was reelected as Council vice president after completing Thompson’s term, and Vic Michaels, director of physical education and athletics for the Archdiocese of Detroit, was reelected as secretary-treasurer.
Additionally, Wyoming Godfrey-Lee Schools superintendent Arnetta Thompson and Freeland Middle School principal Jennifer Thunberg were appointed for second two-year terms on the Council.
The Representative Council is the legislative body of the MHSAA. All but five members are elected by member schools. Four members are appointed by the Council to facilitate representation of females and minorities, and the 19th position is occupied by the Superintendent of Public Instruction or designee.
The MHSAA is a private, not-for-profit corporation of voluntary membership by more than 1,500 public and private senior high schools and junior high/middle schools which exists to develop common rules for athletic eligibility and competition. No government funds or tax dollars support the MHSAA, which was the first such association nationally to not accept membership dues or tournament entry fees from schools. Member schools which enforce these rules are permitted to participate in MHSAA tournaments, which attract more than 1.4 million spectators each year.