Graston Technique is utilized in many professional, Olympic, and collegiate sports therapy programs. Specifically-designed stainless steel instruments have rounded, concave and convex edges. The edges are not sharp and are used to detect and effectively treat soft tissue fibrosis or chronic inflammation. With these instruments the practitioner can scan over and detect areas of fibrotic tissue.
Your friends who have had the treatment before will tell you the muscles feel "bumpy with knots" or like its "going over a washboard."
Scar tissue forms when tissue does not heal correctly, or is under chronic, repetitive stress. Scar tissue is weaker than normal muscle and connective tissue, which is why it becomes chronically sore with activity.
Scar tissue forms when the body lays down bad fibers. With continuous and repetitive stress such as running and lifting, scar tissue accumulates and becomes problematic. Some scar tissue forms between muscles everyday, but normal stretching and movement breaks it up. When scar tissue permanently accumulates it creates fascial adhesions or "patches" that don't function like normal muscle or tendons (the knot you feel in muscles).
And NO a foam roller does not break up scar tissue. Can you break up an onion by squishing it? Or do you need to pull the layers apart?