Source of Support: None, Conflict of Interest: None
The Q-Angle has been a subject of great debate. Its values have not been ascertained for the Indian population. A study of 500 limbs in 250 subjects was undertaken to establish normal values. The subjects included 140 males and 110 females. The measurements were done using standard clinical methods by a single examiner. The average Q-angle in our series was 13.070o with 12.364o in males and 13.968o in females. The average patella : patellar tendon ratio in our series was 0.9807. Q-angle was found to have a significant positive correlation with female sex, interspinous distance and intermallcolar distance. A negative correlation was found between Q-angle and length of lower limb, length of patellar tendon and vertical length of patella. However, the most significant factor to alter the Q-angle was the lateral placement of tibial tuberosity from the vertical axis of patella.