Venous Leg Ulcers: Evidence for Copper Dressings in Hard-to-Heal Wounds

Why do venous leg ulcers fail to heal?

Venous leg ulcers (VLUs) are a manifestation of chronic venous insufficiency and represent one of the most persistent types of chronic wound in clinical practice.

Despite compression therapy being the cornerstone of treatment, a significant proportion of VLUs fail to progress towards healing due to ongoing biological disruption within the wound environment.

Key contributing factors include:

• Persistent inflammation
• Elevated protease activity (including MMP imbalance)
• Impaired tissue remodelling
• Biofilm-associated microbial burden
• Recurrent infection or bioburden persistence

These factors create a wound environment that remains biologically “stuck” in a non-healing state.

What happens when standard care fails?

When VLUs fail to respond to standard compression-based care and adjunctive therapies, clinicians often escalate to advanced dressings targeting:

• Infection control
• Exudate management
• Debridement support

However, clinical evidence suggests that some wounds remain unresponsive even after prolonged use of antimicrobial agents such as silver-based dressings.

At this point, the wound is typically classified as “hard-to-heal” and requires reassessment of underlying wound biology.

What does clinical evidence show about copper dressings in hard-to-heal wounds?

Evidence 1: Venous leg ulcer case series (25 patients)

A multi-centre case series evaluated copper oxide–impregnated dressings in 25 patients with refractory VLUs that had failed standard care.

Key findings included:

• 80% complete wound closure within 12 weeks
• Significant reduction in wound severity scores (RESVECH 2.0, p < 0.001)
• Improved granulation and epithelialisation
• Effective infection control without systemic antibiotics
• Consistent results across multiple international wound care centres

These findings suggest that altering the wound microenvironment may allow stalled VLUs to re-enter the healing trajectory.

(Karpeniuk et al., 2025)

What about wounds unresponsive to silver-based dressings?

Evidence 2: Hard-to-heal wound case series (4 patients)

A separate clinical evaluation examined four patients with chronic wounds (6–9 months duration) that had failed to respond to silver-based dressings over 6–9 weeks.

Following a switch to copper-based dressings:

• ≥50% wound size reduction within 7 days
• 100% wound closure within 4 weeks
• Significant reduction in pain scores (4.75 → 0.25)
• Improved mobility and quality of life
• 86% reduction in treatment costs compared with prior care

These outcomes were observed in wounds previously unresponsive to conventional antimicrobial management.

(Dhoonmoon, 2025)

How might copper-based dressings influence wound healing?

Across both datasets, several overlapping mechanisms are proposed:

1. Antimicrobial and biofilm disruption

Copper ions exhibit broad-spectrum antimicrobial activity, including effects on biofilm-associated bacteria, helping reduce persistent wound bioburden.

2. Modulation of wound inflammation

Chronic wounds are often characterised by sustained inflammatory signalling and protease imbalance, which may prevent progression to healing phases.

3. Support of tissue repair processes

Copper is implicated in:

• Angiogenesis
• Extracellular matrix formation
• Collagen and elastin synthesis
• Tissue remodelling pathways

These mechanisms are associated with progression from stalled to active healing states.

Why are VLUs particularly relevant?

Venous leg ulcers represent a condition where:

• Compression addresses the mechanical cause
• But biological wound dysfunction often persists

This explains why some VLUs fail to respond despite technically correct standard care.

The evidence presented suggests that modifying the wound environment itself may be a key missing component in refractory cases.

What is the clinical significance of these findings?

Across both clinical datasets:

• Hard-to-heal wounds demonstrated rapid improvement after copper-based intervention
• Both venous and non-venous chronic wounds showed accelerated healing trajectories
• Improvements were observed in healing, pain reduction, mobility, and cost burden

This suggests a potential role for copper-based dressings as part of a broader strategy for managing stalled wound healing.

Clinical takeaway

• VLUs often fail to heal due to persistent biological dysfunction, not just venous pressure
• Standard antimicrobial approaches (including silver dressings) may be insufficient in refractory wounds
• Copper-based dressings were associated with rapid improvement in wound progression across multiple case series
• Evidence suggests benefits in both wound healing outcomes and patient-reported quality of life

References

• Karpeniuk S, et al. (2025). Effective Management of Venous Leg Ulcers by Copper Dressings – Case Series.
• Dhoonmoon L. (2025). Healing hard-to-heal wounds and improving quality of life.