Many patients get good results with injections for low back pain. In general, though, the results are mixed. A recent article suggested that injection therapy can relieve pain with few side effects. But sometimes it doesn't do much more for patients than placebo injections, which are basically like getting no treatment at all.
Researchers are trying to figure out whether injection therapy helps patients in the long run. So far, the long-term results aren't all that promising. Talk with your doctor about how this treatment may help you, given your condition.