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Objective anterior cruciate ligament testing.

R J Boniface, F H Fu, K Ilkhanipour

    Orthopedics
    |March 1, 1986
    PubMed
    Summary
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    The Stryker knee laxity tester effectively identifies anterior cruciate ligament (ACL) tears by measuring tibial displacement. This objective tool complements clinical exams, accurately detecting ACL injuries with high sensitivity.

    Area of Science:

    • Orthopedic Surgery
    • Sports Medicine
    • Biomechanics

    Background:

    • Clinical assessment of anterior cruciate ligament (ACL) injuries can be subjective.
    • Objective measurement tools are needed to enhance diagnostic accuracy for knee laxity.
    • The Stryker knee laxity tester offers a potential solution for quantifying anterior tibial displacement.

    Purpose of the Study:

    • To evaluate the clinical usefulness of the Stryker knee laxity tester in assessing anterior cruciate ligament integrity.
    • To determine the correlation between objective laxity measurements and confirmed ACL injuries.
    • To compare laxity measurements in healthy athletes, ACL-injured patients, and injured patients with intact ACLs.

    Main Methods:

    • Measured anterior and posterior tibial displacement using the Stryker knee laxity tester in 123 healthy athletes, 30 patients with arthroscopically confirmed ACL tears, and 11 injured patients with intact ACLs.

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  • Measurements were taken at 20 degrees of knee flexion under a 20 lbs force.
  • Analyzed anterior laxity, posterior laxity, total anterior-posterior laxity, and side-to-side differences.

    • Main Results:

    • Anterior laxity and side-to-side difference significantly correlated with ACL injury.
    • In ACL tears, mean anterior laxity was 8.1 mm, with 94% measuring ≥5 mm; 89% showed a side-to-side difference of ≥2 mm.
    • Measurements in injured knees with intact ACLs did not differ significantly from normal knees.

    Conclusions:

    • The Stryker knee laxity tester provides objective knee laxity measurements that are useful in evaluating anterior cruciate ligament injuries.
    • Objective laxity measurements, particularly anterior laxity and side-to-side difference, serve as a valuable complement to the standard clinical knee examination.
    • The device demonstrated high sensitivity in detecting acute ACL tears with no false positives in this study cohort.