Effectiveness of Dry Needling and Ischemic Trigger Point Compression in the Gluteus Medius in Patients with Non-Specific Low Back Pain: A Randomized Short-Term Clinical Trial

This randomized controlled trial investigated the efficacy of two therapeutic approaches for the treatment of latent myofascial trigger points in the gluteus medius muscle in patients with nonspecific low back pain. The research involved 80 participants who were randomly divided into two treatment groups: dry needling (n=40) and ischemic compression (n=40).

The methodology included a single treatment session for each group, with assessments performed before the intervention, immediately after, 48 hours later, and one week after treatment. The dry needling group received Hong's fast-in/fast-out technique, using 0.25x60 mm needles, with the goal of obtaining local twitch responses. The ischemic compression group received manual pressure on the trigger point for 90 seconds, repeated up to three times.

Results revealed significant differences between the groups at different time points. Ischemic compression proved superior for immediate pain relief, with a significant reduction on the visual analog scale right after treatment. However, this effect was not maintained over time. In contrast, dry needling initially caused a slight increase in pain (known as post-needling soreness) but produced more sustained improvement at 48 hours and one week after treatment.

For pressure pain threshold, dry needling showed progressive improvement, with significant increases in threshold after 48 hours that were maintained at one week. Quality of life, measured by the Oswestry Disability Index, improved in both groups, but with greater benefit in the dry needling group.

The clinical implications suggest that the choice between the two techniques may depend on specific therapeutic objectives. For immediate pain relief in hyperalgesic trigger points, ischemic compression may be preferable. For more lasting benefits in pain reduction, improvement in pressure pain threshold, and quality of life, dry needling demonstrated superiority.

The study has some important limitations, including the relatively small sample size, short-term follow-up, and the fact that both groups were treated by the same physical therapist. In addition, no significant differences in range of motion were observed between the groups as measured by the Schober test, which may indicate the need for larger samples or different assessment methods.