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In CASI’s reference manual, there is a small section about the Q angle as a key anatomical difference between the typical male and female body types. But exactly what is the Q angle?The quadriceps or “Q” angle is the angle at which the quadriceps muscle meets the kneecap compared to the line formed by the ligament attaching the kneecap to shin. To assess the Q angle: find the pointiest part of the hip bone (ASIS) and draw an imaginary line from here through the centre of the kneecap (patella). Then imagine another line from the bony point just below the kneecap (tibial tuberosity) up through the centre of the kneecap again. The angle between these two lines is the Q angle.