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Related Experiment Videos

Lateral knee compartment osseous pseudoligamentous instability.

V A Scudese, M Scudese

    Archives of Surgery (Chicago, Ill. : 1960)
    |February 1, 1975
    PubMed
    Summary

    This study describes false knee instability caused by bone fractures, not ligament tears. A specific knee adduction snap-click test aids in diagnosing this rare condition.

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    Area of Science:

    • Orthopedic Surgery
    • Radiology
    • Sports Medicine

    Background:

    • Intra-articular knee instability typically results from ligamentous injuries.
    • A rare form of instability can arise from osseous pathology within the knee joint.
    • Fractures of the posterior lateral femoral condyle can mimic ligamentous instability.

    Purpose of the Study:

    • To report occurrences of intra-articular lateral knee compartment osseous pseudoligamentous instability.
    • To describe a novel clinical diagnostic test for this specific type of instability.
    • To highlight the association between this instability and posterior lateral femoral condyle fractures.

    Main Methods:

    • Case series reporting five occurrences of osseous pseudoligamentous instability.
    • Clinical examination including a manual straight-knee adduction snap-click test.
    • Radiographic assessment for fracture identification.

    Main Results:

    • Five cases of intra-articular lateral knee compartment osseous pseudoligamentous instability were identified.
    • Three of these cases were associated with fractures of the posterior lateral femoral condyle.
    • A positive manual straight-knee adduction snap-click test was a key diagnostic finding.

    Conclusions:

    • Intra-articular lateral knee compartment osseous pseudoligamentous instability is a distinct entity caused by fracture.
    • The manual straight-knee adduction snap-click test is a valuable diagnostic adjunct.
    • This instability requires recognition and differentiation from true ligamentous instability.

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