Health-related Outcomes after a Youth Sport–related Knee Injury
Bibliographic record
Abstract
PURPOSE: Active youth are vulnerable to knee injury and subsequent osteoarthritis. Improved understanding of the association between health-related outcomes and history of joint injury could inform osteoarthritis prevention strategies. The purpose of this historical cohort study is to examine the association between youth sport-related knee injury and various clinical, physiological, behavioral, and functional health-related outcomes, 3-10 yr postinjury. METHODS: Participants included 100 individuals who experienced a youth sport-related knee injury 3-10 yr earlier and 100 age-, sex-, and sport-matched uninjured controls. Outcomes include the following: Knee Injury and Osteoarthritis Outcome Score (KOOS), Intermittent and Constant Osteoarthritis Pain Score, body mass index (BMI), fat mass index (FMI), weekly physical activity, estimated aerobic capacity, hip and knee muscle strength, and dynamic balance. Baseline characteristics were described. Multivariable regression models (95% confidence interval [CI]) were used to evaluate the association between injury history and each outcome, considering the influence of sex and time since injury. RESULTS: Participant median age was 22 yr (range, 15-26 yr), and 55% were female. The injured group demonstrated poorer KOOS subscale scores, more total and intermittent pain, higher BMI (1.8 kg·m; 95% CI = 0.9-2.6), higher FMI (1.1 kg·m; 95% CI = 0.5-1.6), weaker knee extensor (-0.18 N·m·kg; 95% CI = -0.33 to -0.02) and flexor (-0.21 N·m·kg; 95% CI = -0.30 to -0.11) muscles, and poorer balance than controls. In the previously injured group, female sex was associated with poorer KOOS quality-of-life scores, knee flexor strength, and greater FMI, whereas longer time since injury was associated with poorer KOOS symptoms scores, knee extensor strength, and balance outcomes. CONCLUSION: Youth that suffer a sport-related knee injury demonstrate on average more negative health-related outcomes consistent with future osteoarthritis compared with uninjured matched controls 3-10 yr after injury. These negative outcomes differ by sex and time since injury.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.000 | 0.004 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".