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The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve
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Navigated TKA After Osteotomy Versus Primary Navigated TKA: A Matched-Pair Analysis.

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    Navigated total knee arthroplasty (TKA) after osteotomy showed comparable clinical and radiological outcomes to primary TKA. However, TKA following osteotomy resulted in significantly higher mediolateral ligamentous instability.

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    Area of Science:

    • Orthopedics
    • Knee Surgery
    • Biomechanical Analysis

    Background:

    • Osteotomy is sometimes performed before total knee arthroplasty (TKA) to correct deformities.
    • Navigated TKA aims to improve surgical accuracy and outcomes.
    • The impact of prior osteotomy on navigated TKA stability is not well understood.

    Purpose of the Study:

    • To compare clinical and radiological outcomes of navigated TKA following osteotomy versus primary navigated TKA.
    • To assess mediolateral ligamentous stability in both groups.

    Main Methods:

    • Retrospective matched-pair analysis of 58 navigated TKAs (29 in study group, 29 in control).
    • Study group: navigated TKA after distal femoral or high tibial osteotomy.
    • Control group: primary navigated TKA. Clinical and radiological assessments were performed.

    Main Results:

    • Both groups demonstrated comparable clinical scores (Oxford Knee Score, Tegner, Lysholm, Knee Society Score).
    • Radiological evaluations revealed no significant differences between the groups.
    • The study group (post-osteotomy) exhibited significantly higher mediolateral ligamentous instability (P<.001).

    Conclusions:

    • Navigated TKA following osteotomy yields similar clinical and radiological results to primary navigated TKA.
    • A notable finding is the increased mediolateral ligamentous instability in patients who underwent navigated TKA after osteotomy.
    • Further research may be needed to address and manage this instability in navigated TKA post-osteotomy cases.