Melody,
You have it backward. The doctor is giving her trigger point injections in the knot. Let's see if I can explain. I had triggerpoint injections for years for myofascial pain. The muscle or ligament goes into a tight spasm. It creates a lump or knot that is composed of all the tiny fibers in that muscle or ligament. You can actually feel this knot. Sometimes massage will work them out, sometimes not because it is spasmed so tightly. The doctor will then insert a needle directly into the center of the knot which then loosens the knot. By rubbing the knot afterward and stretching it, it will loosen up and hopefully go away. I've had triggerpoint injections into knots that were so tight, the needle made a crunching sound when it was inserted into it. The injections are given with lidocaine, or procaine and some doctors use a tiny amount of steroid also.

Hope this helps explain it better.
Billye