Effectiveness of Ecoguided Percutaneous Neuromodulation of the Multipurpose Musculature of L-3 in Non-specific Chronic Lumbar Pain.

The experimental group will be treated with percutaneous neuromodulation using a needle with Physio Invasive® device, in its modality of percutaneous electrostimulation for 15 minutes, and guided by ultrasound equipment in the multifidus muscles of L-3, once a week for 4 weeks.

The control group will apply a transcutaneous treatment with surface electrodes with TENS current at 170 Hz for 15 minutes in the L-3 region, once a week for 4 weeks.