1. The Q-angle of the knee is measured with the patient standing
  2. One line is drawn from the ASIS through the midpoint of the patella, and the other line is drawn from the tibial tuberosity through the midpoint of the patella
  3. The Q-angle is formed by the intersection of these two lines.

Q-Angle test for knee


Positive Q-Angle Test

< 130°: Genu varum, patella alta, lateral collateral ligament injury, surgical removal of the medial meniscus, femoral retroversion, internal tibial torsion

> 180°: Genu valgum, patella baja, medial collateral ligament injury, overpronation syndrome, femoral anteversion, lateral tibial torsion

Clinical notes:

Normal: 13° – 18°
Males are generally at the lower end of the range
Females are generally at the upper end of the range