"I crushed my t12 in my spine 2 yrs ago and have chronic pain in my back. I also have PMR which is polymyalgia ruematica. Would cannabis help? "
PMR has an underlying inflammatory mechanism, so yes CBD in particular can help reduce inflammation and the associated pain. Cannabis, through the CB2 receptor, has also been shown to promote bone formation in laboratory studies, but the clinical effects in humans isn't known. You could certainly try a high-CBD product, and even try a topical applied to your back and shoulders, which can have pain-relieving effects.