Fish Skin Before STSG: Staged DFU Reconstruction

Medical education note: This content is for clinicians and does not replace device IFUs or institutional protocols.

Quick Take

For chronic, non-healing diabetic foot ulcers (DFUs) resistant to conservative management, a two-stage surgical strategy—acellular fish-skin graft (FSG) to optimize wound bed quality, followed by split-thickness skin graft (STSG)—demonstrated uniformly complete graft take, rapid wound healing, and no major postoperative infections or graft failures in a UT Health San Antonio series.

Why Stage DFU Closure?

STSG success depends critically on wound-bed quality. In compromised beds—common in diabetes due to ischemia, neuropathy, and bioburden—graft take is suboptimal and healing prolonged. Piscine-derived acellular fish-skin, rich in omega-3 fatty acids and intact extracellular matrix, served as a bioactive scaffold to stimulate granulation and vascularized tissue, creating a graft-receptive surface before STSG.

Who Was Treated & How It Worked

Patient with complex foot ulcer, initial visit.

• Population: Adults with chronic, non-healing DFUs that failed meticulous local wound care and off-loading.
• Stage 1 – Prepare & prime the bed: Sharp debridement of devitalized tissue, then application of acellular fish-skin to the wound base. Clinicians waited for healthy granulation and visible FSG incorporation.
• Stage 2 – Definitive cover: Once the bed appeared ready, clinicians performed STSG.

Outcomes That Matter to Limb-Salvage Teams

Diabetic foot ulcer four weeks into healing after acellular fish skin graft.

• Graft take: Complete in each patient; no graft failures.
• Complications: No major postoperative infections; no FSG-related adverse events.
• Function: Baseline or improved ambulatory status at follow-up; minimal donor-site morbidity.
• Speed: Authors report rapid wound healing and reduced healing time compared with historical DFU trajectories.

Practical Playbook: FSG → STSG

1. Debride decisively. Remove all nonviable tissue; manage infection and optimize perfusion.
2. Apply fish-skin graft. Ensure conformal contact with the wound base; protect with secondary dressings and maintain off-loading.
3. Wait for "integration signals." Look for robust granulation and visible FSG incorporation before scheduling STSG.
4. Perform STSG. Proceed once the bed is uniformly vascular and free of slough or gross bioburden.
5. Rehab & surveillance. Continue off-loading, glucose control, and serial assessments.

Why This Approach Can Help Your Service

• Biology before coverage: FSG provides a bioactive scaffold that upgrades bed quality, improving STSG uptake in high-risk DFUs.
• Fewer setbacks: The series saw no major postoperative infections or graft failures.
• Functional focus: Maintaining (or improving) ambulation matters as much as closure.

Limitations

This is an early, single-team experience without a control group. While findings are promising, the authors call for larger comparative studies to validate timing, patient selection, and cost-effectiveness.

Bottom Line

In high-risk DFUs, fish-skin grafting to prime the wound bed followed by STSG is a pragmatic staged pathway that yielded reliable graft take, fast healing, and no major complications—while maintaining patient mobility.

References

1. Zhao Y, Shen QQ. Acellular fish skin grafts in diabetic foot ulcer care: meta-analysis and clinical insights. World J Diabetes. 2025.
2. McCartan B, et al. The Use of Split-Thickness Skin Grafts on Diabetic Foot Ulcerations. Eplasty. 2012.
3. Gao J, et al. Efficacy of acellular fish skin graft in chronic ulcers: meta-analysis. 2024.
4. Dardari D, et al. Intact fish skin graft vs standard of care in diabetic foot wounds. Medicina. 2022.
5. IWGDF Offloading Guideline 2023.
6. IWGDF/IDSA 2023 Infection Guideline.