April 23, 2026

What is Instrument-Assisted Soft Tissue Manipulation (IASTM)?

Instrument‑Assisted Soft Tissue Mobilization (IASTM) is a manual therapy approach used to address myofascial restrictions and soft‑tissue dysfunction. Physical therapists as well as other certified practitioners (ie. manual therapists, massage therapists, and chiropractors) apply specialized instruments (usually medical-grade stainless steel) to the skin to facilitate targeted mobilization of soft tissue. The technique is designed to reduce adhesions, support the reorganization of collagen during scar‑tissue remodeling, and improve overall tissue quality. In clinical practice, IASTM is sometimes referred to by branded names such as GrastonTechnique®, or colloquially as “muscle scraping.” In Eastern medicine, Gua Sha represents a traditional healing counterpart, utilizing similar mechanical principles to influence soft‑tissue mobility.

Emerging research suggests that IASTM may contribute to reductions in pain and improvements in functional mobility. Several studies have reported short‑term benefits in range of motion, flexibility, and patient‑reported pain levels, particularly in conditions involving soft‑tissue tightness or overuse. Some evidence also indicates that IASTM may help modulate local inflammatory responses and influence neuromuscular activity, which may explain observed reductions in muscle tension or spasms. While findings are promising, current research emphasizes that outcomes vary by individual and condition, and IASTM is most effective when integrated into a comprehensive treatment plan that may include exercise, stretching, and other therapeutic interventions.

If you are interested in incorporating this modality into your care, you can discuss it with your provider at your next visit. They can help determine whether IASTM aligns with your goals and whether it is appropriate for your specific condition.