In short. Negative-pressure wound therapy, advanced dressings, and other adjuncts to wound healing, and what the evidence does and does not support.
Key points
- Perfusion, pressure relief, compression where indicated, infection control, and blood-sugar control are what allow a wound to close.
- Adjuncts work at the margins of those measures, not instead of them.
- If a wound is not shrinking, the honest question is which basic measure is missing — not which product to buy next.
Alongside debridement, offloading, compression, and infection control, a growing range of products and devices is offered to speed wound healing. Some have good evidence behind them; many have enthusiastic marketing and thin data. Knowing which is which protects both money and time.
Negative-pressure wound therapy
Negative-pressure wound therapy applies controlled suction through a sealed foam or gauze dressing. It removes excess fluid, holds the wound edges together, and increases blood flow at the wound surface. The evidence supports its use in carefully selected wounds — particularly open surgical wounds, grafts that need to be held in place, and deep wounds being prepared for closure — and it does not support routine use on every chronic wound. It requires a clean, adequately perfused wound, does not replace debridement or pressure relief, and cannot be used over untreated infection or exposed, untreated bleeding vessels.
Dressings
Modern dressings manage moisture, exudate, and bacterial burden, and they protect new tissue. Hydrocolloids, foams, alginates, hydrogels, and silver-containing dressings each suit particular wound states. What the evidence does not support is the idea that any dressing closes a wound by itself: trials consistently show that dressing choice influences comfort and exudate far more than healing rates. A wound that is not healing is almost never failing because the wrong dressing was used.
No dressing substitutes for the basics
Perfusion, pressure relief, compression where indicated, infection control, and blood-sugar control are what allow a wound to close. Adjuncts work at the margins of those measures, not instead of them. If a wound is not shrinking, the honest question is which basic measure is missing — not which product to buy next. Expensive dressings used on a wound that is still being walked on, or still swollen, change nothing at all.
Other adjuncts
Compression therapy is an adjunct by classification but is the main treatment for venous ulcers, and offloading devices serve the same role in the diabetic foot. Skin substitutes and biological dressings can help selected wounds, particularly burns and donor sites, though evidence and cost vary widely. Growth-factor preparations, platelet-rich plasma, and oxygen therapies have been studied with mixed results, and their routine use is not supported. Systemic measures — nutrition, stopping smoking, and control of diabetes, anaemia, and thyroid disease — have some of the strongest evidence of all, and are the most routinely overlooked.
Using adjuncts sensibly
An adjunct is reasonable when the basics are in place, the wound is not healing, and the product is used with a defined goal and a review date. If it has not helped by that date, it should be stopped. That discipline is what separates evidence-based wound care from an accumulating collection of unused dressings.
Seek urgent review if
- The wound enlarges or deepens despite treatment, or new black tissue appears.
- Odour, discharge, or pain increases, or fever and spreading redness develop.
- Negative-pressure therapy causes bleeding, severe pain, or skin breakdown around the seal.
Frequently asked questions
Does negative-pressure wound therapy help every chronic wound?
No. The evidence supports it in carefully selected wounds, particularly open surgical wounds, grafts that need holding in place, and deep wounds being prepared for closure. It needs a clean, adequately perfused wound, does not replace debridement or pressure relief, and cannot be used over untreated infection.
Can a better dressing close a wound on its own?
No. Modern dressings manage moisture, exudate and bacterial burden, and they protect new tissue, but trials consistently show that dressing choice influences comfort far more than healing rates. A wound that is not healing is almost never failing because the wrong dressing was used.
How do I know whether an adjunct is worth continuing?
Set a defined goal and a review date before starting. An adjunct is reasonable when the basics are in place and the wound is still not healing. If it has not helped by that date, it should be stopped rather than continued indefinitely.
Risks & Limitations
- Chronic wounds heal over months, not weeks. A wound that closes in three to six months of consistent care is a good result.
- Recurrence is common. Both diabetic foot wounds and venous leg ulcers frequently return, which is why protective footwear and compression continue after healing.
- Partial or complete failure of a skin graft or flap, which may require further surgery.
- Infection and biofilm, which delay healing by weeks and can spread deeply or into bone.
- Amputation risk in diabetes and vascular disease, which is reduced but never abolished by treatment.
- Prolonged dressings and repeated clinic visits. Offloading, compression, and follow-up are demanding and take months.
- Donor-site scarring and discomfort where a graft or flap was taken.
- Reduced or absent sensation in grafted and flap tissue, and around a healed diabetic foot wound.
When to Seek Care
- A wound that is enlarging or deepening, or that begins to expose bone, tendon, or joint.
- Black, grey, or dead tissue appearing in or around the wound.
- Spreading redness, warmth, or swelling around the wound.
- Fever, shivering, or feeling generally very unwell.
- Foul odour or pus from the wound.
- New or severe pain, including pain in the leg or foot at rest or at night.
- A toe or foot that turns black, cold, or blue.
- Loss of sensation in a foot or toe, or a new wound or blister you cannot feel.
References & Further Reading
- World Health Organization (WHO) — chronic wound and diabetes care resources
- NICE (National Institute for Health and Care Excellence) — guidance on wound care, diabetic foot problems, and pressure ulcers
- Wounds International — international consensus documents on wound infection, biofilm, and compression therapy
- American Society of Plastic Surgeons (ASPS) — plastic surgery guidance on wound closure
- Cochrane Library — systematic reviews in wound care and wound closure
This page is patient education, not medical advice, and it does not cite individual studies. Discuss your own case with a qualified clinician. To arrange an assessment at Chongqing West District Hospital, see Contact & Consultation.