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The Capital Region of Denmark - a part of Copenhagen University Hospital
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Knee extensor strength and hop test performance following anterior cruciate ligament reconstruction

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  1. Reliability of stress radiography in the assessment of coronal laxity following total knee arthroplasty

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  2. Assessment of objective dynamic knee joint control in anterior cruciate ligament deficient and reconstructed individuals

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  3. A comparison of hamstring muscle activity during different screening tests for non-contact ACL injury

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  1. Reliability of the Copenhagen Achilles length measure (CALM) on patients with an Achilles tendon rupture

    Research output: Contribution to journalJournal articleResearchpeer-review

  2. Strength Testing After Anterior Cruciate Ligament Reconstruction: A Prospective Cohort Study Investigating Overlap of Tests

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  3. Treatment of osteoarthritis with autologous and microfragmented adipose tissue

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BACKGROUND: 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.

METHODS: 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%.

RESULTS: 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.

CONCLUSIONS: 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.

Original languageEnglish
JournalThe Knee
Volume26
Issue number1
Pages (from-to)149-154
Number of pages6
ISSN0968-0160
DOIs
Publication statusPublished - 1 Jan 2019

    Research areas

  • ACL, Anterior cruciate ligament, Hop tests, Quadriceps strength, Return to play, rtp, Prospective Studies, Follow-Up Studies, Humans, Middle Aged, Muscle Strength/physiology, Postoperative Period, Male, Anterior Cruciate Ligament Injuries/physiopathology, Young Adult, Adolescent, Anterior Cruciate Ligament Reconstruction, Adult, Female, Knee Joint/physiopathology, Movement/physiology, Sports

ID: 55881837