Trigger points in Plantaris are often associated with "unexplained" pain at the back of the knee    Trigger Points and Knee Pain - Overview          Any therapist experienced in treating trigger points will tell you that it's amazing how often a little bit of trigger point knowledge can help identify the cause of "unexplained" pain. A good example is clients who come to us with pain in the back of the knee, sometimes radiating to the back of the calf, and in a few cases radiating all the way down to the big toe....