Where is the scar tissue, how big, how recently was this? Is there still a blood supply? Those rollers are pretty good we use Astym tools in therapy, to help break down the adhesions to any bone and break up that scar tissue, and even before all these Astym tools came out we did cross friction massage, also pushing down into the scar to break up the scar tissue, we also strecth the scar apart gently..mechanically, with these tools you can do the same thing or even better....sorry don't know the details and Im rushing but if its a keloid or hypertrophic scar compression garments 20-30mm to control the size of it, your provider should have told you about that if needed.