The Q angle is an estimate of the effective angle at which the quadriceps averages its pull. defined as the angle formed by the line of pull of the quadriceps and the line representing the patellar tendon. It is determined by drawing a line from the Anterior Superior Iliac Spine to the center of your knee cap and a second line from the center of your knee cap to the insertion of the patellar tendon . Normal is below 12 degrees, abnormal is usually considered to be above 15 degrees.


思考:Q角增大会产生什么力学改变，临床上会出现什么症状？..