Orthopedics Book

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Patella Tracking Assessment

Aka: Patella Tracking Assessment, J Sign
  1. Mechanism
    1. Imbalance between vastus medialis and lateral forces
  2. Technique
    1. Knee exposed for observation
    2. Positioning
      1. Performs a single leg squat and stand or
      2. Lies supine with knee extended from flexed position
  3. Interpretation: J-Sign
    1. Patella abruptly deviates medially on early flexion

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