Q (quadriceps)-angle

Q (quadriceps)-angle

the angle between the long axis of the femur (and thus the line of pull of the quadriceps) and the line of the patellar tendon (extended upwards); describes the extent to which the line of pull is not straight. In practice, it is measured as the angle between the line from the anterior iliac spine to the centre of the patella, and the line from there to the tibial tubercle. Normally less than 20° (14° in males, 17° in females) but often greater in some female runners who have a wider than average pelvis. Factors which increase the Q-angle include genu valgum (knock knees), patellar subluxation, weak quadriceps, tight hamstrings and overpronated feet. Relevant in the diagnosis of patello femoral pain and used in treatment as an indication of relative quads strength, allowing appropriate strength work. See fig overleaf .