Radiofrequency Nerve Ablation Versus Sham to Treat Chronic Low Back Pain Caused by Sacroiliac Joint Dysfunction

Patients presenting with low back pain associated with SIJD for longer than 6 months, and who have not had positive responsive to the conservative treatments: * Pharmacologic Management * Therapies; physical, acupuncture, massage etc… * Other alternative treatments Enrollment, Treatment/Sham Procedure, Follow-up at 3 weeks, 6 weeks with unblinding, 4, 6, 9 months. Un-blinding occurring at 6 weeks with crossover option to receive treatment. Total visits 7 with enrollment approximately over a period of 9 months. Trial extension optional for phone contact at year 1, 2. Sham subjects receiving treatment will be followed at months 6 weeks, 4, and 6 months with phone calls at year 1, 2. Patients who complete at least 50% of their patient diaries, and miss no more 2 consecutive office visits. Data will be used if patients have remained enrolled thru 4 month visit.