Conservative treatment of acute and chronic nonspecific low back pain.

Specific interventions included in the review Bed rest, orthoses, exercise therapy, back schools, spinal manipulation, analgesics, non-steroidal anti-inflammatory drugs (NSAIDS), muscle relaxants, antidepressants, epidural steroid injections, transcutaneous electrical nerve stimulation (TENS), traction, behavioural therapy, electromyographic biofeedback and acupuncture. Control treatments varied between studies, and included placebo for some evaluations.