Scars and Adhesions

Populations and Risk Factors

• Post-surgical patients: Surgery disrupts tissue planes, activating the fibroblastic repair response across anatomical boundaries; abdominal surgery produces visceral adhesions in 67–93% of cases; orthopedic surgery produces periarticular adhesions that restrict ROM
• Individuals recovering from burns: Burn scars produce the most severe contracture due to extensive tissue destruction; the scar contracts across flexion surfaces, limiting joint extension; hypertrophic and keloid scarring is common
• Deep wound and laceration recovery: Full-thickness wounds that disrupt the dermis and deeper structures heal by secondary intention (granulation and contraction) rather than primary intention (edges approximated), producing more scar tissue
• History of inflammation or immobilization: Inflammation stimulates fibroblast activity; immobilization allows collagen to organize randomly rather than along stress lines — the combination produces dense, inelastic scar tissue and adhesions
• Genetic predisposition to keloid formation: Keloid scarring is strongly familial; individuals of African, Asian, and Hispanic descent have 5–15 times higher keloid incidence; keloids extend beyond the original wound boundary and do not spontaneously regress
• Systemic conditions affecting wound healing: Diabetes (impaired microcirculation and inflammatory response); corticosteroid use (suppresses collagen synthesis); malnutrition (protein and vitamin C deficiency impairs collagen production)
• Age: Older adults produce less collagen but more disorganized scar tissue; wound healing is slower, increasing the window for adhesion formation; conversely, young children tend to heal with minimal scarring
• Infection during healing: Wound infection prolongs the inflammatory phase, increases tissue destruction, and produces more extensive scarring

Causes and Pathophysiology

• Wound healing phases (the foundation for understanding scars): All scar formation follows the same three-phase repair process. Understanding these phases is essential because the timing and type of massage intervention is determined by which phase the tissue is in:
• Inflammatory phase (0–72 hours to 1 week): Hemostasis (platelet plug, fibrin clot) followed by neutrophil and macrophage infiltration to clear debris and bacteria. Macrophages release growth factors (TGF-beta, PDGF, VEGF) that recruit fibroblasts to the wound site. The tissue is edematous, warm, erythematous, and painful. During this phase, the wound is protected by the clot and has minimal tensile strength (~5% of normal tissue). Massage at the wound site is contraindicated during this phase — disrupting the clot delays healing and increases infection risk.
• Proliferative phase (3 days – 3 weeks): Fibroblasts migrate to the wound and begin synthesizing Type III collagen, which is deposited in a random, disorganized "basket-weave" pattern. Angiogenesis (new capillary formation) occurs simultaneously, producing the red, vascular granulation tissue. Wound contraction begins as myofibroblasts (specialized contractile fibroblasts) pull the wound edges together. By the end of this phase, the wound has ~25% of normal tissue tensile strength. The collagen at this stage is thin, immature, and fragile — but it is already responsive to mechanical stress. Gentle cross-fiber techniques can begin in the late proliferative phase to influence collagen alignment.
• Remodeling phase (3 weeks – 6–24 months): The most therapeutically important phase. Type III collagen is gradually replaced by Type I collagen through enzymatic degradation (matrix metalloproteinases, MMPs) and new synthesis. Type I collagen is thicker, stronger, and more highly cross-linked than Type III. Under the influence of mechanical stress (Wolff's law for connective tissue), the collagen fibers realign along the predominant lines of tension — this is the principle that makes cross-fiber friction and deep tissue mobilization effective. At full maturity (12–24 months), the scar achieves 70–80% of the original tissue's tensile strength but never fully recovers. The scar transitions visually from red/purple (vascular) to white/glistening (avascular) as the capillary network regresses.
• Type III to Type I collagen remodeling: This transition is the key biological process that massage influences. Type III collagen is thin (50–60 nm diameter), loosely cross-linked, and mechanically weak — it is the "emergency repair" collagen. Type I collagen is thick (>100 nm), densely cross-linked, and provides the structural strength of the mature scar. The remodeling phase involves: (1) MMP enzymes break down Type III fibers; (2) fibroblasts synthesize Type I fibers; (3) mechanical stress (from movement and manual therapy) guides the orientation of the new Type I fibers along functional stress lines. Without mechanical stress, the Type I collagen is deposited randomly, producing a dense, inelastic scar. With controlled mechanical stress (cross-fiber friction, myofascial release, progressive stretching), the Type I collagen aligns along the lines of tension, producing a more extensible, functionally organized scar.
• Scar maturation timeline: The scar continues to remodel for 6–24 months:
• 0–6 weeks: Immature scar — red/purple color (highly vascular), soft, pliable, maximally responsive to mechanical stress
• 6 weeks – 6 months: Maturing scar — color fading from red to pink; increasing firmness as Type I collagen cross-linking increases; still responsive to mechanical stress but requires more force
• 6–24 months: Mature scar — pale, firm, relatively inelastic; less responsive to mechanical stress; established cross-links are harder to reorganize; maximum tensile strength achieved (~70–80% of original)
• >24 months: Fully mature — minimal further change; established collagen architecture is essentially permanent without aggressive intervention
• Adhesion formation mechanism: Adhesions form when the inflammatory repair process extends beyond the boundary of the original injury. The key event is fibrin deposition — fibrin bridges form between adjacent tissue surfaces (e.g., between a healing muscle and its overlying fascia, between a healing tendon and its sheath, between visceral organs and the peritoneum). If these fibrin bridges are not disrupted by early movement, fibroblasts invade the bridges and replace the fibrin with collagen, converting temporary adhesions into permanent fibrotic bands. This is why early mobilization (within the constraints of healing phase) is critical for adhesion prevention — movement mechanically disrupts the fibrin bridges before they can be colonized by fibroblasts.
• Scar types:
• Hypertrophic scar: Elevated, firm scar that remains within the boundaries of the original wound; develops from excessive collagen deposition during the proliferative phase; may soften and flatten over 1–2 years; responsive to massage and compression therapy
• Keloid: Extends beyond the wound boundaries into previously healthy tissue; involves an abnormal fibroblastic response with excessive Type I and Type III collagen deposition; does NOT spontaneously regress; genetic predisposition (more common in darker skin types); resistant to massage alone; may require medical intervention (steroid injection, silicone sheeting, radiation)
• Contracture: The scar contracts across a joint or mobile area, physically limiting ROM; most common after burns across flexion surfaces; the myofibroblast contraction pulls tissue inward; requires sustained mechanical stress (splinting, stretching, massage) to lengthen
• Atrophic scar: Depressed or pitted scar from loss of underlying tissue (acne, chickenpox); the dermis was not fully restored during healing; massage may improve surrounding tissue mobility but does not fill the tissue deficit
• Scar mobility assessment (clinical evaluation): Scar mobility is assessed by attempting to move the scar in all directions relative to the underlying tissue. A healthy, well-remodeled scar should move freely in all planes. An adhered scar is restricted in one or more directions — the restriction indicates the plane of adhesion. Assessment also includes the "thumbnail test" — running a thumbnail along the scar with moderate pressure; sharp, disproportionate pain suggests a neuroma (nerve entrapped within the scar tissue) and requires careful, progressive desensitization before deeper scar mobilization.

Signs and Symptoms

By Scar Maturity

General Findings

• Visual distortion: puckering, tethering, or deformity at or near the scar site — indicates adhesion to underlying tissue
• Color indicates maturity: red/purple (immature, vascular, treatable); white/glistening (mature, avascular, more resistant)
• Scar adherence to underlying bone, muscle, or fascial layers — detected by attempting to move the scar in all directions; restriction in one direction indicates the plane of adhesion
• Restricted ROM — joint motion is limited by the inelastic scar tissue bridging the joint; extensor lag (unable to actively extend fully despite passive range being available) indicates scar tethering of the extensor mechanism
• Hypersensitivity or numbness in and around the scar — nerve fibers are disrupted and regenerate within the scar matrix; disorganized nerve regrowth produces both hypersensitivity (neuromas) and areas of numbness
• Hardened, leathery, or inelastic tissue quality — the collagen is densely cross-linked and lacks the pliability of healthy tissue
• Surrounding muscle compensation — muscles proximal and distal to the scar develop hypertonia and altered firing patterns to compensate for the restricted movement

Assessment Profile

Subjective Presentation

• Chief complaint: Stiffness and restricted movement at or near a scar — "I can't fully straighten my knee since the surgery" or "my neck scar from the surgery feels tight and pulls when I turn my head"; some patients present primarily with pain (neuroma or nerve entrapment) rather than restriction
• Pain quality: Tightness and pulling sensation with movement (mechanical restriction); sharp, shooting pain along the scar (neuroma or nerve entrapment); itching and tingling in immature scars (collagen remodeling and nerve regeneration); deep aching in surrounding muscles (compensatory overload)
• Onset: Gradual — restriction develops progressively as the scar matures and collagen cross-links increase; the patient often reports that the initial surgical/injury recovery went well but the ROM "stopped improving" or "started getting worse" weeks to months later as the scar contracted
• Aggravating factors: Movements that stretch or load the scar tissue; prolonged positioning that places tension on the scar; cold environments (scar tissue has poor thermoregulation and becomes stiffer in cold); sustained postures (scar contracts toward its resting length)
• Easing factors: Warmth (increases collagen pliability through thixotropy); gentle movement and stretching (the "warm-up" effect); massage and manual mobilization; silicone sheeting or topical moisturizers (maintain hydration and pliability)
• Red flags: Rapidly growing, painful, irregular scar with color changes → refer for medical evaluation to rule out malignancy; wound that reopens, has purulent discharge, or shows increasing redness and warmth → active infection; contraindicated for local massage; refer; scars from recent surgery (<3 weeks) with sutures or staples still in place → too early for direct scar work; treat surrounding tissue only

Observation

• Local inspection: Scar color indicates maturity (red/purple = immature; pink = maturing; white/glistening = mature); scar type (flat, hypertrophic, keloid, contracture, atrophic); tethering or puckering of skin indicating adhesion to deeper layers; contracture bands bridging joints; surrounding tissue changes (postural compensations secondary to the restriction)
• Posture: Compensatory posture to accommodate the scar restriction — cervical scar: lateral head tilt toward the scar; abdominal scar: forward trunk lean; extremity scar: joint held in the position that reduces tension on the scar; chronic compensations may develop into fixed postural patterns (upper or lower crossed syndrome)
• Gait: Altered gait if the scar involves the lower extremity or trunk — shortened stride, antalgic pattern, reduced push-off or swing phase range depending on scar location

Palpation

• Tone: Hypertonic muscles proximal and distal to the scar — compensatory guarding to protect the restricted area; the surrounding fascia is often restricted, creating a broader zone of tissue inelasticity beyond the visible scar; trigger points commonly develop in muscles that compensate for the lost ROM
• Tenderness: The scar itself ranges from painless (well-healed, mature) to hypersensitive (neuroma, trapped nerve fibers); the thumbnail test — running a thumbnail along the scar with moderate pressure — produces sharp, disproportionate pain if a neuroma is present; surrounding muscles are tender from compensatory overload; deep tenderness beneath the scar may indicate adhesion to underlying bone or periosteum
• Temperature: Immature scars may be warm (vascular); mature scars are typically cool or neutral (avascular); scar tissue has poor thermoregulation compared to normal tissue; surrounding tissue temperature is usually normal
• Tissue quality: Scar tissue feels firm, inelastic, and dense compared to surrounding healthy tissue; mobility assessment is the key palpation finding: attempt to move the scar in all directions (superior, inferior, lateral, medial, rotational); restriction in any direction indicates adhesion to the underlying tissue in that plane; the direction of maximal restriction indicates the primary adhesion plane and guides treatment direction; chronic scars may have surrounding fascial thickening that extends beyond the visible scar boundary

Motion Assessment

• AROM: Reduced ROM in the direction that stretches the scar — the restriction is specific to the scar's orientation across the joint; extensor lag (full PROM but AROM falls short) indicates scar tethering of the extensor mechanism or tendon adhesion; the ROM restriction is consistent (does not improve with warm-up as dramatically as muscular restriction)
• PROM / end-feel: Firm, leathery end-feel — the scar tissue reaches its maximum extensibility before the joint's bony end-range; this is distinct from capsular (firm but with more "give"), muscle stretch (elastic), and spasm (abrupt, involuntary stop); in contracture, the end-feel may be hard (the scar has become so dense that it mimics a bony stop); PROM may exceed AROM significantly if tendon adhesion is limiting active movement (extensor lag pattern)
• Resisted testing: Usually pain-free and strong unless the scar involves a tendon or muscle belly — tendon adhesions produce pain with resisted contraction because the tendon cannot glide freely; muscle belly scars may produce pain-inhibited weakness if the scar limits the muscle's ability to contract through its full range

Special Test Cluster

Healing phase determines treatment intensity. Always assess the scar's maturity (color, pliability, age) before selecting technique depth. Immature scars respond to light technique; mature scars require sustained, firmer intervention.

Differential Diagnoses