What does the Q angle measure and from where is it measured?

The Q angle, or quadriceps angle, specifically measures the angle formed by the quadriceps muscle and the patellar tendon. It is assessed by drawing two lines: one from the anterior superior iliac spine (ASIS) to the center of the patella and another from the center of the patella to the tibial tuberosity. This measurement helps in understanding the alignment of the knee joint and can indicate the forces acting on the patella during movement, which is particularly important in assessing the risk of patellar tracking disorders and knee injuries.

Understanding the significance of the Q angle is crucial in fields such as kinesiology, physical therapy, and sports science, as it provides valuable insights into joint mechanics and potential issues related to knee alignment.