The study was designed to compare the efficacy of two different modalities of transcutaneous electrical nerve stimulation (conventional and low-frequency TENS) (C-TENS and Low-TENS) and percutaneous neuromodulation therapy (PNT) in the treatment of chronic low back pain. Sixty patients with chronic low back pain were randomly divided into four groups as placebo-TENS, C-TENS, Low-TENS, and PNT. Therapeutic modalities were administered for 2 weeks. The pre-treatment and post-treatment assessments were done by using the visual analog scale for pain; Low Back Pain Outcome Scale and Oswestry Disability Index for functional disability; and Health Status Survey Short Form (SF-36) for quality of life. In placebo-TENS group only emotional role limitation score of SF-36 significantly decreased after the treatment. All measurements except emotional role limitation score of SF-36 significantly improved in C-TENS group after the treatment. In both of Low-TENS and PNT groups, all parameters were significantly improved by the treatment. TENS modalities and PNT were significantly more effective than the placebo-TENS. No significant difference was found between C-TENS and Low-TENS. PNT was significantly more effective than TENS in providing relief of activity pain and in improving general health, vitality and emotional role limitation scores of health quality.

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