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Related Experiment Videos

Patellar tracking

B Reider, J L Marshall, B Ring

    Clinical Orthopaedics and Related Research
    |June 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    This study reveals that most cadaver knees exhibit a medial patellar tracking pattern during extension. Medial retinaculum release significantly disrupted normal patellar tracking, highlighting its crucial role.

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    Area of Science:

    • Orthopedics
    • Biomechanics
    • Anatomy

    Background:

    • Understanding normal patellar tracking is crucial for diagnosing and treating patellofemoral pain syndrome.
    • The role of the medial and lateral retinaculum in guiding patellar motion is not fully elucidated.

    Purpose of the Study:

    • To investigate patellar tracking patterns in cadaveric knees.
    • To evaluate the effect of retinacular release on patellar kinematics.
    • To assess the impact of a specific surgical realignment procedure on patellar tracking.

    Main Methods:

    • Twenty cadaver knees were analyzed to document patellar tracking during knee extension.
    • Surgical release of the lateral and medial retinacula was performed sequentially.
    • The effects of a "proximal realignment" procedure (medial imbrication-lateral release) were assessed.

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    Main Results:

    • A predominant medial patellar shift and tilt (Type 1) was observed in 17 out of 20 knees.
    • Three knees (Type 2) demonstrated a tendency towards lateral patellar shift and tilt.
    • Medial retinaculum release significantly altered patellar tracking in Type 1 and Type 2 knees.
    • The "proximal realignment" procedure exacerbated medial patellar tilt and shift during extension.

    Conclusions:

    • The medial retinaculum plays a critical role in maintaining normal patellar tracking during knee extension.
    • Surgical interventions, such as "proximal realignment," may inadvertently promote abnormal medial patellar tracking.