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15 The association between physical activity and 3–15 year history of sport-related intra-articular knee injury: a matched cohort design
  1. Clodagh Toomey1,2,
  2. Jackie Whittaker1,3,4,
  3. Patricia Doyle-Baker1,2,5,
  4. Carolyn Emery1,2,6
  1. 1Faculty of Kinesiology, University of Calgary, Canada
  2. 2The Alberta Children’s Hospital Research Institute, Cumming School of Medicine, University of Calgary, Canada
  3. 3Glen Sather Sport Medicine Clinic, University of Alberta, Canada
  4. 4Department of Physical Therapy, Faculty of Rehabilitation Medicine, University of Alberta, Canada
  5. 5Faculty of Environmental Design, University of Calgary, Canada
  6. 6Cumming School of Medicine, University of Calgary, Canada


Introduction Much injury literature has focused on successful return-to-sport in the two-years following traumatic knee injury. However, little is known regarding physical activity (PA) participation in the post-rehabilitation period (3–15 years later), which may be a stronger determinant of future health and risk of joint disease.

Materials and methods A sub-sample of the Alberta Youth PrE-OA cohort wore a waist-mounted accelerometer device (ActiGraph wGT3X-BT) for 7 days. This cohort was comprised of individuals with a 3–15 year history of sport-related intra-articular knee injury and age, sex and sport-matched uninjured controls. Descriptive statistics [mean within-pair difference (95% CI)] were used to compare moderate-to-vigorous PA (MVPA) between pairs. Multivariable linear regression was used to explore the association between MVPA and Knee Injury and Osteoarthritis Outcome Score (KOOS) subscales (scored/100), controlling for injury history.

Results Seventy-six participants were recruited (38 injured and 38 matched-controls; 16–28 years; 63% female). Previously injured participants were a median of 8.2 years since injury and spent significantly less time in daily MVPA compared to matched-controls [−13 min (95% CI: −24 to –2)]. There was a significant association between MVPA and two of the KOOS subscales, sport and recreation (β=0.68, 95% CI: 0.1 to 1.3) and quality-of-life (QOL; β=0.89, 95% CI: 0.1 to 1.7) that was not modified by injury history.

Conclusion Youth and young adults spend less time in MVPA 3–15 years after sustaining a traumatic knee injury compared to matched-controls. This may be partly explained by a perceived reduction in knee function related to sport and recreational activities (e.g. running/jumping) and QOL (e.g. lifestyle modification).

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