Hello. I have a back injury (4 fractured vertebrae and an abnormal curvature of my spine) and when it is really sore and hurts, it helps relieve some of the pain if I make a fist and use my knuckles to, fairly deeply massage and press fairly deep in the soft muscle and tissue spots around my spine that are sore, and I'm just wondering if this is a bad idea and could possibly maybe cause further injury, or if it's fine as long as I don't press too hard and deep in the muscle and tissue.