The Q-angle is formed by the line from the ASIS to the center of the patella and the line from the patella to the tibial tuberosity. Normal values: 10-15 deg (males), 15-20 deg (females).

How does Q-angle affect patellofemoral pain?

Larger Q-angles increase the lateral pull on the patella, elevating lateral facet contact stress and predisposing to patellofemoral pain syndrome (PFPS), patellar maltracking, and chondromalacia.

Patellofemoral Stress from Quadriceps Q-Angle Calculator

Calculate patellofemoral joint stress from quadriceps force and Q-angle. Normal Q-angle: 10-15 deg males, 15-20 deg females. Higher Q-angle increases lateral patellar compression.

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Patellofemoral Stress from Quadriceps Q-Angle Calculator

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Frequently Asked Questions

What is the Q-angle?

How does Q-angle affect patellofemoral pain?