Histopathologic Analysis of a Recalcitrant Calcaneal Wound Treated Using a Synthetic Hybrid-scale Fiber Matrix

Summary: Traditionally, full-thickness wounds with exposed structures are treated with flap coverage or dermal regenerative templates. Most dermal regenerative templates are biologic in origin, but recently synthetic options have become available. One such product is a synthetic hybrid-scale fiber matrix (SHSFM). In this case, SHSFM was used to treat a recalcitrant calcaneal wound. After the wound granulated, it was biopsied, and histopathologic analysis was conducted. A 16-year-old woman involved in a motor vehicle collision sustained multiple traumatic injuries which were stabilized. Postoperatively, she developed a calcaneal infection and associated wound, which developed into a chronic, nonhealing wound. Failed treatments included removal of hardware, multiple debridements, and advanced wound therapies. An SHSFM was then trialed, which led to granulation of the wound without infection. Despite wound healing, the patient subsequently elected to undergo a below-the-knee amputation due to pain and functional disability from posttraumatic ankle arthritis. The heel was biopsied at the time of amputation for analysis. Pathologists noted excellent granulation tissue formation and complete coverage of the wound surface area and 75% of the wound depth, which included epithelialization and decreasing inflammation at wound edges. Collagen deposition and numerous interspersed blood vessels were present. Foreign material and bacteria were absent. No osteomyelitis was observed. This analysis provided the opportunity to investigate the in vivo regenerate from a novel synthetic SHSFM. Given the uniqueness and challenges presented in this case, the usage of this relatively new product warrants further investigation with larger populations and assorted wound etiologies.