The Quadriceps angle of the knee is a measurement of the angle between the quadriceps muscles and the patellar tendon and provides useful information about the alignment of the knee joint.

Image showing the way the q-angle is calculated
It is a guide to the sideways forces going through the patella.
Q angle

Important patellofemoral concepts

Part 2 of a course on Patellofemoral Pain by Dr Ronald Grelsamer of Mount Sinai Hospital in New York.



Q-angle question.

Knee Guru, Anyone, I am Clueless!


Q-angle: an invaluable parameter for evaluation of anterior knee pain. Emami MJ, Ghahramani MH, Abdinejad F and Namazi H. Arch Iran Med. 2007 Jan;10(1):24-6.

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