اندازه گيري كلينيكي و مقايسه اي زوايه كشش عضله چهارسرراني در حالتهاي خوابيده به پشت و ايستاده در مردان

Clinical and Comparative Measurement of Q Angle in Men in Supine and Standing Position

Introduction: Q Angle is one of stabilizer factors of the patellofemoral joint. In fact it is angle of traction of quadriceps and this muscle exerts its forces to patella bone with it. By unusual increase and decrease in value of the Q angle, more pressure will be done on the patellofemoral joint. For this reason, its measurement is important in clinic. This study was conducted to determine mean Q angle, in men in supine and standing position. Material and Methods: In this research the mean Q angle was measured, for 140 males 16-31 years, in supine and standing positions on the dominant knee. Also comparison of Q angle in both positions and itʹs correspondence with age, width of pelvis, weight, length of lower limb, diameter of quadriceps muscle have been done. This angle has been measured by using a specially modified goniometer, which consists of two arms (one of them longer and the other shorter), and a fulcrum in center. Statistic analysis has been done by SPSS and EP15 soft wares. Results: The mean value of Q angle was 12.55° (range 6° to 24°) in supine position and 14.76° (range 7° to 26°) in standing position. According to statistic evaluation, there is positive relationship between Q angle in both position and with width of pelvis (p<0.05). Conclusion: The mean of Q angle always is higher in standing position that knee valgus angulation forces increase because of weight-bearing. An angular increase in both positions in normal people depends on the width of pelvis, by increasing the width of pelvis, the Q angle increases accordingly.