Measurement of wound area for early analysis of the scar predictive factor.

The study included only 22 patients with 32 chronic wounds from a single outpatient clinic, so it cannot show how the ruler performs in many different wound settings. Klonk was chosen as the reference after comparing only three figures, so the accuracy claims are relative to that chosen standard, not an independent gold standard. The same researcher performed all assessments, dressing changes, and wound bed preparations, and also supplied the ruler and materials, which may introduce measurement bias. Highly exudative and circumferential lower-limb wounds were difficult to trace, and exudate had to be reduced to prevent slipping. Wound area can increase after debridement because of tissue flexibility, so area reduction alone is not a simple sign of healing. The study did not test patient healing outcomes or compare treatments; it compared measurement methods.

Do not conclude that the 2D-FlexRuler improves healing or that wound area reduction proves a treatment works. The study measured area estimates in 22 patients with 32 wounds, and all wounds also received PHMB cleaning, debridement when needed, and topical agents such as PHMB gel, silver, or cadexomer iodine, so the contribution of any single component cannot be separated.