Pilot study finds 23.8% reduction in measured scar depth

A scar can look the same in the mirror and still change beneath the skin. In a pilot study of 17 patients, one session of direct-current microcurrent stimulation was associated with a 23.8% reduction in measured postsurgical scar depth, recorded immediately with a high-resolution three-dimensional ultrasound probe.

The researchers measured the same anatomical locations before and after treatment using a 17 MHz volumetric probe. Each session lasted approximately 15–20 minutes: two Dolphin Neurostim devices delivered current along both sides of the scar for 30 seconds per point at approximately half-inch (1.3 cm) intervals, using opposing polarities. Mean scar depth decreased by 0.447 mm, a statistically significant change with p < 0.001 and a 95% confidence interval of 0.264 to 0.630 mm.

That measurement matters because the study looked at structure rather than relying only on photographs or patient impressions. The authors suggest that changes in scar shape could eventually affect tissue mobility, fascial glide—the movement between connective-tissue layers—and rehabilitation. But those clinical effects remain hypotheses. Participants spontaneously reported improvements in pain and range of motion, yet the researchers did not formally measure either outcome.

And so, concretely? The technique could become a way to study whether a noninvasive treatment changes scar tissue in a measurable way, and perhaps to guide future rehabilitation research. It is not yet evidence that patients will move better, hurt less, or keep the result over time. The current finding describes an immediate change after one session.

The limits are clear. This was a small, nonrandomized cohort with no control or placebo group, and no long-term follow-up. The authors call for larger controlled studies to test whether the reduction is sustained and whether repeated treatments produce similar or greater effects. For now, the strongest contribution may be the measurement method: ultrasound that lets researchers follow scar structure with more precision.