Instrument-assisted soft tissue mobilization (IASTM) — often called scraping — uses specialized tools, typically stainless steel, drawn across the skin over the target tissue. Graston Technique and ConnecTx are two well-known systems.
The claim, and what's actually likely
It's traditionally described as breaking down scar tissue and adhesions, physically remodelling the tissue.
That explanation doesn't hold up well. The forces a handheld tool can apply through skin are nowhere near what's needed to disrupt mature scar tissue or dense fascia. If they were, the treatment would cause serious injury.
The more defensible mechanisms:
- Mechanoreceptor stimulation altering nervous system output to the area
- Localized inflammatory response potentially stimulating fibroblast activity and tissue turnover
- Pain modulation through the nervous system
- Improved sliding between tissue layers
- Sensory input change, reducing protective guarding
About the redness
Treatment often produces reddening — petechiae — which is frequently presented as evidence of adhesions breaking up.
It isn't. It's small capillaries responding to mechanical pressure, and its appearance varies mostly with skin type, pressure and individual susceptibility rather than with how much "restriction" was present. More bruising does not mean a better treatment, and aggressive application isn't a marker of quality.
Where it's genuinely useful
- Chronic tendinopathies — tennis elbow, Achilles, patellar
- Plantar fasciitis
- Post-surgical or post-injury tissue restriction
- Chronic muscular tension that hasn't responded to hands-on work
- Cases where a therapist needs to apply focused pressure without fatiguing their hands
What a session involves
An emollient is applied, the tool is drawn over the tissue in specific patterns, usually for a few minutes per area. It shouldn't be sharply painful. Some redness and mild soreness for a day or so is normal.
Where we avoid it
Over open wounds, active infection, areas of acute inflammation or bruising, over thin fragile skin, in people on anticoagulants or with bleeding disorders, and over known malignancy.
We use Graston and ConnecTx as one part of treatment — most effective, as always, when combined with progressive loading rather than delivered on its own.