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Young Athletes Who Return to Sport Before 9 Months After Anterior Cruciate Ligament Reconstruction Have a Rate of New Injury 7 Times That of Those Who Delay Return

Journal article
Authors Susanne Beischer
L. Gustavsson
Eric Hamrin Senorski
Jón Karlsson
C. Thomee
Kristian Samuelsson
Roland Thomeé
Published in Journal of Orthopaedic & Sports Physical Therapy
Volume 50
Issue 2
Pages 83-90
ISSN 0190-6011
Publication year 2020
Published at Institute of Neuroscience and Physiology, Department of Health and Rehabilitation
Institute of Clinical Sciences, Department of Orthopaedics
Pages 83-90
Language en
Links dx.doi.org/10.2519/jospt.2020.9071
Keywords adolescent, rehabilitation, subsequent ACL Injury, acl reconstruction, graft rupture, knee, risk, predictors, reliability, surgery, Orthopedics, Rehabilitation, Sport Sciences
Subject categories Orthopedics

Abstract

OBJECTIVE: To investigate the association between sustaining a second anterior cruciate ligament (ACL) injury and (1) time to return to sport, (2) symmetrical muscle function, and (3) symmetrical quadriceps strength at the time of return to sport in young athletes after primary ACL reconstruction. DESIGN: Prospective cohort study. METHODS: Patient demographics and results from 5 tests of muscle function (2 strength tests and 3 hop tests) were extracted from a rehabilitation registry. A questionnaire was sent to athletes (1530 years old) who were involved in knee-strenuous sport before the injury and had undergone primary ACL reconstruction to determine time of return to knee-strenuous sport (preinjury Tegner Activity Scale score of 6 or greater). We used the Cox proportional hazard regression model to analyze time to event. RESULTS: One hundred fifty-nine (32% of initial sample) athletes (mean +/- SD age, 21.5 +/- 4.4 years; 64% female) were included. Athletes with a higher preinjury Tegner Activity Scale score had a higher rate of second ACL injury (hazard ratio = 2.1; 95% confidence interval: 1.2, 3.6; P<.01). Athletes who returned to knee-strenuous sport before 9 months after reconstruction had a higher rate of second ACL injury (hazard ratio = 6.7; 95% confidence interval: 2.6,16.7; P<.001). There was no association between symmetrical muscle function or quadriceps strength and second ACL injury. CONCLUSION: Returning to knee-strenuous sport before 9 months after ACL reconstruction was associated with an approximately 7-fold increased rate of sustaining a second ACL injury. Achieving symmetrical muscle function or quadriceps strength was not associated with new ACL injury in young athletes.

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