The Knee Learning Resource
The Q-angle is a measurement that gives an indication of the likelihood of excessive forces tending to pull the patella over to the outer (lateral) side.
The Q-angle is the angle made by two lines - one drawn from the middle of the kneecap (patella) to the bony bump a thumbsbreadth below it on the shin (the tibial tubercle), and the other being the line of the femur bone (see illustration).
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