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Acquired valgus instability after knee replacement

H U Cameron, W R Harris

    Clinical Orthopaedics and Related Research
    |January 1, 1981
    PubMed
    Summary
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    Acquired valgus instability after knee resurfacing can occur due to falls disrupting the medial collateral ligament. Adequate bracing and proper component placement are crucial to prevent this complication.

    Area of Science:

    • Orthopedic Surgery
    • Biomedical Engineering

    Background:

    • Knee resurfacing aims to restore joint function but carries risks.
    • Acquired valgus instability is a potential complication following total knee arthroplasty.

    Observation:

    • Four cases of acquired valgus instability after knee resurfacing were identified.
    • Initial stability was noted in all cases prior to the onset of instability.
    • Three patients had pre-existing varus deformities requiring extensive soft-tissue releases.

    Findings:

    • Instability resulted from falls that disrupted the medial joint capsule and medial collateral ligament.
    • Potential contributing factors included tibial component malrotation and medial projection.
    • Early cases might have been prevented with adequate post-operative bracing until quadriceps recovery.

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    Implications:

    • Proper tibial component alignment and rotation are critical during knee resurfacing.
    • Post-operative bracing protocols may be necessary for high-risk patients.
    • Bracing followed by revision to a constrained prosthesis is a potential treatment strategy.