Clinical Efficacy of Ovine Forestomach Matrix and Collagen/Oxidised Regenerated Cellulose for the Treatment of Venous Leg Ulcers: A Retrospective Comparative Real‐World Evidence Study

International Wound Journal
Open Access

Clinical Summary

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What was studied

Retrospective real‑world analysis of venous leg ulcers in US outpatient wound centers (2014–2020), comparing ovine forestomach matrix (OFM) with collagen/oxidized regenerated cellulose (collagen/ORC) under compression. Outcomes were time to closure and incidence of closure at 12, 24, and 36 weeks across 830 VLUs (OFM n=470; collagen/ORC n=360) in 551 patients.

Key findings

Median time to closure was shorter with OFM vs collagen/ORC (11.1±0.6 vs 12.3±1.0 weeks; p=0.045); closure incidence was higher with OFM at 24 weeks (77.6% vs 69.2%; p=0.012) and 36 weeks (86.3% vs 79.7%; p=0.027). Adjusted Cox models showed greater probability of healing with OFM (HR 1.268 [95% CI 1.022–1.573] for ≥4 applications; HR 1.375 [1.011–1.869] for ≥8 applications), and the treatment effect persisted after further adjustment for compression type and skin substitute use (p=0.002).

Study limitations

Nonrandomized, retrospective database study with imbalances in compression type and adjunctive skin substitute use between groups; key variables such as venous ablation were absent and debridement details were missing for many wounds; industry funding with multiple author conflicts of interest.

Clinical implications

In outpatient clinics using compression, OFM was associated with faster and more frequent VLU closure than collagen/ORC at 24–36 weeks. Consider OFM when selecting advanced matrices for VLUs, while interpreting results in light of observational design and potential confounding.