A new study published in the prestigious international medical journal Spine indicates that spinal injection therapy used to treat subacute and chronic low back pain has questionable effectiveness and lacks research evidence. Researchers reviewed 18 previously conducted trials on spinal injections to the epidural area, joints of the spine as well as injections into the spinal muscles. Injections consisted of a variety of drugs including corticosteroids and local anesthetics. Authors of the study stated, "Overall, the results indicated that there is no strong evidence for or against the use of any type of injection therapy." Furthermore they concluded, "There is insufficient evidence to support the use of injection therapy in subacute and chronic low back pain."
Source: Spine: Jan 1 2009 - Volume 34 - Issue 1.