Ben, please consider
http://www.mckenziemdt.org/method.cfm
if there is a McKenzie certified Physical Therapist in your area. I am a psychologist and have (unfortunately) treated a significant number of patients with chronic pain from orthopedic injuries and from failed treatment (orthopedic, chiropractic, or physical therapy treatment) of such. I don't want to contradict or challenge any well-trained practitioner who has actually thoroughly examined you... but I'd be glad to share my opinion further in a PM. [You're account on ETS is over the PM limit, whatever that means..but I think you can still PM me] I don't want to practice over the Internet or offer myself as an "expert" in this or any open forum. But I have been well pleased with my experience with McKenzie-trained Physical Therapists using this approach both for my patients and for myself. Sorry for your troubles!!