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Exercise-related knee joint laxity.

H B Skinner, M P Wyatt, M L Stone

    The American Journal of Sports Medicine
    |January 1, 1986
    PubMed
    Summary
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    Exercise-induced muscle fatigue can increase knee laxity, potentially raising the risk of ligament injuries in athletes. This study found significant increases in knee joint laxity after fatigue protocols.

    Area of Science:

    • Sports Medicine
    • Biomechanics
    • Orthopedics

    Background:

    • Knee injuries are a significant concern in both professional and recreational sports.
    • The link between athletic conditioning, fatigue, and knee injuries remains debated.
    • Ligaments, composed of collagen, exhibit viscoelastic properties under stress.

    Purpose of the Study:

    • To test the hypothesis that muscular fatigue can induce knee laxity.
    • To determine if fatigue-induced laxity increases the risk of knee ligament injury in athletes.

    Main Methods:

    • An exercise protocol was used to induce fatigue in hamstring and quadriceps muscles.
    • Isokinetic testing measured knee flexion and extension power to document fatigue.
    • A knee arthrometer (KT-1000) quantified ligament laxity before and after exercise.

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    Main Results:

    • Significant increases in left knee joint laxity were observed post-exercise at 15 and 20 pounds of force (P < 0.05).
    • Maximum manual displacement also showed a significant increase in joint laxity (P = 0.02).
    • Post-exercise, significant left-right knee laxity differences emerged at multiple force measurements (P < 0.01).

    Conclusions:

    • Exercise-induced muscle fatigue can lead to measurable increases in knee joint laxity.
    • This increased laxity may heighten the susceptibility of athletes to knee ligament injuries.
    • Fatigue protocols significantly impact knee joint stability, particularly in the non-tested limb.