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Related Experiment Videos

Knee stability and knee ligament injuries.

A Kalenak, C A Morehouse

    JAMA
    |December 15, 1975
    PubMed
    Summary

    Knee ligament stability and injury risk are not predictable through subjective joint laxity tests or objective biomechanical evaluations. Exercise programs based on subjective assessments are therefore not scientifically sound.

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    Area of Science:

    • Orthopedics
    • Sports Medicine
    • Biomechanics

    Background:

    • The relationship between knee ligament stability and the incidence of knee injuries remains a subject of debate.
    • Subjective assessments of joint laxity (tightness or looseness) have been suggested as a basis for exercise prescription.

    Purpose of the Study:

    • To investigate the relationship between knee ligament stability and knee injuries in college football players.
    • To determine if subjective joint laxity evaluations correlate with objective biomechanical measures of knee stability.

    Main Methods:

    • Biomechanical studies of knee ligament stability were conducted on 401 college football players between 1969 and 1971.
    • Joint laxity tests were performed on 72 college football players.
    • Injury data was collected and analyzed in relation to player joint laxity classifications.

    Main Results:

    • Of 43 knee ligament injuries, 19 occurred in "loose-jointed" players and 24 in "tight-jointed" players.
    • The distribution of college football players failing joint laxity tests differed from that reported for professional players.
    • No significant relationship was found between subjective joint laxity tests and objective biomechanical knee ligament stability evaluations.

    Conclusions:

    • Predicting knee injuries based on subjective joint laxity or objective biomechanical evaluations is not feasible.
    • Exercise programs for knee injury prevention should not rely solely on subjective assessments of joint laxity.

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