📌The patellofemoral joint stability is very much dependent upon its compressive pull of the quadriceps and patellar tendon.
👉 Clinically, the stability of the patella can be measured by determining the angle of quadriceps pull which is known as the Q angle. "It is the line connecting from Anterior Superior Iliac Spine (ASIS) to midpoint of patella and to the tibial tuberosity" . ➡️The normal Q angle ranges from 10 to 15° at full knee extension [1, 15].➡️ An increase in the Q angle would increase the lateral force and instability to the patella.
👉 The common factors that increase the Q angle and subsequent lateral position of patella include muscular imbalance between vastus medialis and lateralis (lateralis being stronger will pull patella laterally), tight IT band, genu valgum, femoral anteversion, and lateral tibial torsion.
