IASTM for Scar Tissue: What Clinicians Should Know

Scar tissue is a normal part of healing after surgery, trauma, burns, and other tissue injuries. Many scars become relatively mobile and cause little or no functional limitation, while others may be associated with stiffness, sensitivity, discomfort, or limitations in movement.

When a scar or surrounding tissues are associated with symptoms or movement limitations, Instrument-Assisted Soft Tissue Mobilization (IASTM) may be considered as part of a broader rehabilitation approach when healing status and the clinical presentation support its use.

IASTM should not be viewed as a technique that simply “breaks up” scar tissue. Its use should be guided by the scar's healing status, the patient's symptoms and movement limitations, and the broader rehabilitation goals.

This blog examines the use of IASTM in scar-related rehabilitation, including assessment, timing, application, evidence, precautions, and tool selection.

What Is Scar Tissue and How Can It Affect Movement?

Scar tissue develops as part of the normal wound-healing process, and its characteristics can vary based on the injury or procedure, location, stage of healing, tissue depth, and individual healing response. Many healed scars remain mobile and asymptomatic, while others may be associated with:

• Reduced tissue glide
• Stiffness
• Sensitivity
• Discomfort
• Restricted range of motion
• Changes in movement or function

Clinicians should also distinguish the visible skin scar from changes that may be present in deeper or surrounding tissues. A surgical incision may be healed at the surface while mobility or sensitivity in the surrounding region continues to affect movement or function.

Assessment should therefore extend beyond the appearance of the scar. Tissue mobility, sensitivity, range of motion, symptoms, and functional limitations can all contribute to clinical decision-making.

How Might IASTM Be Used in Scar-Related Rehabilitation?

IASTM uses a specialized instrument to apply controlled mechanical input to soft tissue. In scar-related rehabilitation, treatment may be applied around or, when appropriate, over a sufficiently healed scar based on the patient's presentation and stage of recovery.

Potential treatment goals may include:

• Scar and surrounding tissue mobility
• Tolerance to touch
• Range of motion
• Movement and functional goals

IASTM should be considered an adjunct rather than a stand-alone treatment for scar tissue and may be incorporated alongside exercise, mobility work, strengthening, functional retraining, patient education, or other appropriate interventions.

When Might Clinicians Consider IASTM Around Scar Tissue?

The decision to use IASTM tools around a scar should be based on the patient's presentation, healing status, tissue condition, and rehabilitation goals.

Potential clinical situations may include:

• A sufficiently healed surgical or traumatic scar associated with reduced mobility or movement restriction
• Reduced mobility in the tissues surrounding a scarred region
• Sensitivity or altered tolerance to touch
• Range-of-motion or functional limitations in which the scar or surrounding tissues may be a contributing factor
• Postoperative rehabilitation when healing status and applicable restrictions allow for mechanical treatment

The presence of a scar alone does not establish an indication for IASTM. Treatment decisions should be based on relevant symptoms or functional findings, healing status, and the broader rehabilitation plan.

How Is IASTM Used Around Scar Tissue?

Scar-specific research does not currently support a standardized IASTM protocol. Application should therefore be guided by clinical reasoning rather than a predetermined sequence of strokes, pressure level, or treatment duration.

1. Start Conservatively and Reassess

When mechanical treatment is appropriate, clinicians can begin conservatively and adjust pressure, duration, treatment area, and other variables based on tissue status, symptoms, patient comfort, and treatment goals.

More pressure should not automatically be viewed as more effective, and marked redness, petechiae, or bruising should not be treated as required endpoints or signs of treatment success.

2. Treat Technique Variables as Options, Not a Fixed Protocol

Technique may vary based on scar location, tissue presentation, accessibility, and patient response. Options may include longitudinal or cross-directional application, shorter targeted strokes, or treatment adjacent to the scar when direct contact is not appropriate. These are clinical technique options, not evidence-established rules for scar treatment.

Current scar-management research shows substantial variation in treatment parameters and has not established a standardized or validated manual scar-treatment technique.

3. Match Direct Treatment to Healing Status

Whether treatment occurs directly over a scar, around it, or elsewhere in the region should depend on healing status and clinical presentation. An incompletely healed incision should not be approached like a mature, stable scar; clinicians should consider skin integrity, sensitivity, swelling, inflammation, and applicable procedure-specific restrictions before mechanical treatment.

4. Integrate Movement when Appropriate

When appropriate, clinicians may pair IASTM with active movement, mobility work, or functional exercise. Any instrument-assisted intervention should connect back to the patient's measurable movement and functional goals rather than follow a predetermined treatment sequence.

What Does the Evidence Say About IASTM and Scar Tissue?

Research examining IASTM specifically for scar tissue remains limited. Clinicians should therefore distinguish scar-specific evidence from broader IASTM research, scar-management research, and expert consensus.

What Precautions and Contraindications Should Clinicians Consider?

Precautions and contraindications should be considered before applying IASTM, particularly when tissue is still healing or skin integrity is compromised.

A 2025 international expert consensus identified several strong contraindications relevant to scar-related treatment, including:

• Open skin wounds
• Acute inflammatory skin conditions
• Skin scrapes or blisters
• Acute systemic infection, including viral or bacterial infection, fever, or a contagious condition

The consensus also classified severe skin hypersensitivity and skin rash as moderate contraindications.

Other presentations require more individualized judgment. Healing surgical scars were classified as potentially either a precaution or contraindication, reflecting the need to consider healing stage, tissue condition, symptoms, postoperative restrictions, and whether mechanical loading is appropriate. Skin burn scars were identified as a precaution rather than a contraindication.

When tissue healing or treatment appropriateness is uncertain, clinicians should seek appropriate medical or surgical guidance when indicated.

How to Choose an IASTM Tool for Scar Work

Tool selection should support the clinical task rather than determine the treatment approach. When selecting an IASTM instrument for scar-related work, clinicians may consider:

• Size: Choose an instrument appropriately sized for the scar, treatment area, and anatomical region.
• Shape and profile: Consider whether the instrument provides appropriate access and controlled tissue contact.
• Contact and pressure control: The instrument should allow the clinician to adjust contact and pressure based on the patient's presentation and response.
• Material and cleaning: Consider whether the instrument is compatible with the clinic's cleaning and disinfection procedures.

HawkGrips also offers IASTM education for clinicians looking to build practical knowledge around instrument-assisted soft-tissue techniques.

Key Takeaways for Clinicians

IASTM may have a role in scar-related rehabilitation, but scar tissue should not automatically be treated simply because it is present.

The key considerations are:

• Assess the scar and surrounding region
• Consider the stage and quality of healing
• Identify relevant movement or functional limitations
• Consider medical and postoperative precautions
• Match application to treatment goals and patient tolerance
• Reassess the patient's response rather than following a predetermined protocol

The instrument itself is only one part of evidence-informed IASTM practice. Assessment, clinical reasoning, appropriate technique, and integration with the broader rehabilitation plan remain central to patient care.

For additional equipment, training, and clinical resources, see HawkGrips IASTM tools and IASTM education.

FAQs

Does IASTM break up scar tissue?

No. IASTM should not be described as simply “breaking up” scar tissue. It may be incorporated into scar-related rehabilitation to address mobility, symptoms, movement limitations, and functional goals, but current research does not establish IASTM as a proven method for mechanically breaking down or remodeling scar tissue.

Can IASTM be used on old scar tissue?

Potentially. A mature scar may be considered for IASTM when it is appropriately healed and clinical findings support its use. Scar age alone does not determine whether treatment is appropriate; tissue condition, symptoms, mobility, patient tolerance, and treatment goals should also be considered.

Does scar location affect how IASTM is applied?

Yes. Scar location can affect accessibility, surrounding structures, movement demands, and instrument contact. Positioning and technique should therefore reflect the anatomical region and individual presentation.

Can IASTM be used on raised or thickened scars?

Raised or thickened scars should be assessed before considering IASTM. Hypertrophic scars generally remain within the boundaries of the original wound, while keloids extend beyond the original wound margins and represent a distinct scar presentation. Current evidence does not establish routine IASTM protocols for either. Medical assessment or coordination may be appropriate when a scar is actively changing, symptomatic, inflamed, or suspected to be pathological.

Should IASTM cause redness around a scar?

Redness should not be a treatment goal or considered proof that IASTM was effective. Some temporary skin response may occur, but excessive redness, bruising, irritation, or worsening symptoms should prompt reassessment rather than an assumption that a stronger response indicates better treatment.

Is IASTM appropriate for both surgical and traumatic scars?

IASTM may be considered for appropriately healed surgical or traumatic scars when clinical findings support its use. The decision should reflect healing status, tissue condition, symptoms, movement findings, and the broader rehabilitation plan.

How do clinicians know whether scar tissue is affecting movement?

Clinicians can assess scar and surrounding tissue mobility, sensitivity, range of motion, movement quality, symptoms, and functional limitations. These findings should be considered alongside the patient's goals and movement demands when determining whether the scar or surrounding tissues may be contributing to the limitation.