Autologous full-thickness skin substitute for healing chronic wounds.

Background Chronic wounds represent a major problem to our society. Therefore, advanced wound-healing strategies for the treatment of these wounds are expanding into the field of tissue engineering. Objectives To develop a novel tissue-engineered, autologous, full-thickness skin substitute of entirely human origin and to determine its ability to heal chronic wounds. Methods Skin substitutes (fully differentiated epidermis on fibroblast-populated human dermis) were constructed from 3-mm punch biopsies isolated from patients to be treated. Acellular allodermis was used as a dermal matrix. After a prior 5-day vacuum-assisted closure therapy to prepare the wound bed, skin substitutes were applied in a simple one-step surgical procedure to 19 long-standing recalcitrant leg ulcers (14 patients; ulcer duration 0·5–50 years). Results The success rate in culturing biopsies was 97%. The skin substitute visibly resembled an autograft. Eleven of the 19 ulcers (size 1–10 cm2) healed within 8 weeks after a single application of the skin substitute. The other eight larger (60–150 cm2) and/or complicated ulcers healed completely ( n = 5) or continued to decrease substantially in size ( n = 3) after the 8-week follow-up period. Wound healing occurred by direct take of the skin substitute ( n = 12) and/or stimulation of granulation tissue/epithelialization ( n = 7). Skin substitutes were very well tolerated and pain relief was immediate after application. Conclusions Application of this novel skin substitute provides a promising new therapy for healing chronic wounds resistant to conventional therapies. [ABSTRACT FROM AUTHOR]