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Quadriceps Femoris Muscle AngleAka: Q Angle of the Knee

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  1. Method
    1. Position patient in slight knee flexion (15 degrees)
    2. Measure angle between 2 lines
      1. Line 1: Anterior Superior Iliac to patella center
      2. Line 2: Tibial Tubercle to patella center
  2. Normal Measurement
    1. Men: 11 to 17 degrees
    2. Women: 14 to 20 degrees (due to gynecoid pelvis)
  3. Causes of increased Q angle
    1. Knock-Kneed (Genu Valgum)
    2. Excessive Femoral Anteversion
    3. Medial Tibial Torsion
    4. Laterally positioned tibial tuberosity
    5. Tight lateral retinaculum
    6. Weakness of vastus medialis oblique
    7. High riding patella (patella alta)
  4. Risks associated with increased Q angle
    1. Patellar Subluxation
  5. References
    1. Agliettis (1983) Clin Ortho
    2. Wheeless' Textbook of Orthopedics
      1. http://www.medmedia.com/oo1/234.htm

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