Knee extensor strength and hop test performance following anterior cruciate ligament reconstruction

Knee extensor strength and single limb hop for distance have been suggested as useful measures to evaluate readiness to return to sport after anterior cruciate ligament (ACL) reconstruction. The aim of the study was to examine the association between knee extensor strength and single leg hop for dis...

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Bibliographic Details
Published in:The knee 2019-01, Vol.26 (1), p.149-154
Main Authors: Barfod, Kristoffer W., Feller, Julian A., Hartwig, Taylor, Devitt, Brian M., Webster, Kate E.
Format: Article
Language:English
Subjects:
ACL
Anterior cruciate ligament
Fitness equipment
Hop tests
Knee
Leg
Patients
Quadriceps strength
Rehabilitation
Return to play
rtp
Studies
Symmetry
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Summary:Knee extensor strength and single limb hop for distance have been suggested as useful measures to evaluate readiness to return to sport after anterior cruciate ligament (ACL) reconstruction. The aim of the study was to examine the association between knee extensor strength and single leg hop for distance following ACL reconstruction and to determine the proportion of patients with knee extensor strength symmetry deficits at six and 12 months. From December 2013 to December 2015 69 patients aged 14 to 45 undergoing primary ACL reconstruction were recruited. Isokinetic concentric knee extensor strength testing and single limb hop for distance were performed six and 12 months postoperatively. Satisfactory knee extensor strength was defined as a leg symmetry index (LSI) ≥85%. At six months 27.5% (19/69) of patients had recovered satisfactory knee extensor strength in the injured leg, improving to 46.4% (32/69) at 12 months. Recovery of satisfactory strength was associated with hopping distance. Hop symmetry was achieved considerably faster than knee extensor symmetry, with 66.7% (46/69) of patients demonstrating satisfactory hopping symmetry at six months, 89.9% (62/69) at 12 months. Recovery of hopping distance was not associated with knee extensor strength. Single leg hop test cannot be used as a surrogate measure for knee extensor strength as no association was found between hop tests and knee extensor strength. Less than one in three patients at six months and one in two at 12 months had recovered satisfactory knee extensor strength.
ISSN:0968-0160
1873-5800
DOI:10.1016/j.knee.2018.11.004