Which ligament of the knee initiates the knee-jerk reflex when tapped? Naim 20:34 Joints Which ligament of the knee initiates the knee-jerk reflex when tapped? A) the patellar ligament B) the medial patellar retinacula C) the lateral patellar retinacula D) the extracapsular ligament Answer: A Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+