How To Dry Needle The Gastrocnemius 👉 The gastrocnemius muscle is a large muscle located in the back of the lower leg that is responsible for plantar flexion of the foot and flexion of the knee. 👉 Trigger points in the gastrocnemius muscle commonly develop in three areas: the medial head, the lateral head, and the soleus overlap. These trigger points can cause pain, stiffness, and other symptoms. 👉 Dry needling is a technique used to treat trigger points in the gastrocnemius muscle. It involv