This study uses a mixed-method design combining a quasi-experimental, single-group pre-post intervention with a methodological validation approach.

1. Quasi-experimental, single-group pre-post intervention:

   Participants will receive a standardized physical therapy protocol targeting scar contracture. After intervention, scar extensibility will be measured using traditional tools (Vancouver Scar Scale, tonometer) and a newly developed image-based method.

2. Methodological validation approach: The image-based method will be tested for:

   • Reliability (test-retest, inter-rater)
   • Validity (concurrent validity against established tools and construct validity)

Inclusion Criteria:

• History of clinically diagnosed scar contracture following thermal burns.
• Presence of scars (≥6 months post-burn) to ensure stability for accurate assessment.
• Scars located on functionally mobile areas (e.g., limbs) where extensibility impacts daily activities.
• Willingness to undergo a standardized physical therapy intervention.
• Ability to provide informed consent and comply with all study procedures.

Exclusion Criteria:

• Active infection, unhealed wounds, or unstable scars at the assessment site.
• Diagnosed systemic diseases affecting collagen synthesis or wound healing (e.g., scleroderma, uncontrolled diabetes).
• History of experimental or non-standard scar treatment within the last 3 months.
• Severe cognitive impairments or communication barriers that interfere with understanding or participation.
• Pregnant or lactating women, due to hormonal influences on tissue healing and collagen metabolism.
• Concurrent participation in other physical therapy or rehabilitation studies targeting scar management.