Tissue-Engineered Skin Substitutes.

BACKGROUND: Skin substitutes are frequently used by plastic surgeons today to treat a wide variety of cutaneous defects. They provide methods to heal wounds while minimizing donor sites. They are commonly used in burns, acute wounds, and chronic wounds. METHODS: The authors reviewed the literature on both the development of skin substitutes and their use today. The authors focused their work on what are currently the more commonly used types of skin substitutes in the United States. There is a wide interest in human-derived placental products, which will be the subject of a future publication. RESULTS: Commonly used skin substitutes include semisynthetic dermal scaffolds, allogenic cell constructs, and cellular and decellularized allogenic or xenogenic sources. For semisynthetic dermal scaffolds and allogenic cell constructs, there have been large clinical trials demonstrating their efficacy. CONCLUSIONS: Skin substitutes represent great progress for plastic surgery and provide several advances and options with which to heal wounds. More studies are needed to guide surgeons into the most appropriate use of these materials. Future developments, including advances in scaffolds, stem cells, and tissue processing, are likely to produce even more clinical options for our patients.

Malignant Eccrine Spiradenoma of the Face.

Malignant eccrine spiradenoma, or spiradenocarcinoma, is an exceedingly rare sweat-gland tumor, with only 102 reported cases. Low-grade carcinomas are especially rare with only a few cases reported. Because of the limited number of case reports, the biologic behavior of low-grade malignant eccrine spiradenoma is poorly understood and no evidence-based therapeutic approach is established. Here, the authors report a 29-year-old woman who presented with a history of left-sided facial lesions present since the age of 2 months. Histopathologic examination revealed multiple benign spiradenomas, several of which showed foci of low-grade malignant transformation evidenced by loss of the characteristic 2-cell population seen in the benign tumor component. Included are the clinical presentation, histopathologic description, and surgical decision making in an effort to guide recognition of this rare entity.

Salvage palmar fasciectomy after initial treatment with collagenase clostridium histolyticum.

BACKGROUND: Collagenase clostridium histolyticum was approved for clinical use in 2010 and has become an accepted treatment modality for Dupuytren's contracture. Because longitudinal experience with injectable collagenase remains limited, the effect of treatment on future surgery is not well defined. METHODS: A retrospective review of the senior author's practice from February of 2010 through March of 2014 was performed. Eleven patients were identified who had digital or palmar fasciectomy after at least one previous injection of collagenase clostridium histolyticum. Cases were reviewed for functional outcomes and operative difficulty. RESULTS: Seven metacarpophalangeal joints and 12 proximal interphalangeal joints in 11 patients were treated. Nine of the 11 patients were referred to the senior author after collagenase clostridium histolyticum injections by other hand surgeons; two patients had previous injections by the senior author. The average interval between most recent injection and salvage fasciectomy was 12 months. Intraoperative findings demonstrated disruption of normal architecture and areolar tissue, with extensive scar in the dissection planes after previous injection. Mean preoperative/postinjection joint contracture for metacarpophalangeal and proximal interphalangeal joints was 42 and 60 degrees, respectively; after surgery, joint contractures were 0 and 21 degrees, respectively. Significant improvement in postoperative range of motion was seen for both metacarpophalangeal and proximal interphalangeal joints after palmar fasciectomy. CONCLUSIONS: Collagenase clostridium histolyticum injections may produce a deeply scarred bed and increase the technical difficulty of salvage fasciectomy. However, results of palmar fasciectomy are comparable to those of primary fasciectomy even in the setting of recurrent or progressive disease. CLINICAL QUESTION/LEVEL OF EVIDENCE: Therapeutic, IV.

The impact of conflicts of interest in plastic surgery: an analysis of acellular dermal matrix, implant-based breast reconstruction.

BACKGROUND: Although conflicts of interest in biomedical research have received significant attention, the impact of conflicts of interest on surgical outcomes has not been fully explored. METHODS: A systematic electronic search of the literature was performed for studies that evaluated surgical outcomes in acellular dermal matrix and non-acellular dermal matrix implant-based breast reconstruction. Surgical complications, including infection, seroma, hematoma, necrosis, and explantation, were used as outcome metrics and extracted from studies. Surgical outcomes were then pooled and compared between studies that disclosed conflicts of interest and those that did not disclose conflicts of interest. RESULTS: A total of 776 abstracts were identified, of which only 35 fulfilled the authors' inclusion criteria. Conflicts of interest were reported in 14 of these abstracts (40 percent). The pooled data from studies that reported no conflicts of interest and studies that reported conflicts of interest included a total of 8241 and 5384 breasts and 2852 and 1864 patients, respectively. Considered collectively, surgical complications were less common in studies that reported a conflict of interest than in studies that reported no conflicts of interest. When surgical outcome data were further stratified by acellular dermal matrix use, surgical complications were less common in studies with conflicts of interest when acellular dermal matrix was used. However, when acellular dermal matrix was not used, surgical complications were similar between authors that reported a conflict of interest and those that did not report a conflict of interest. CONCLUSIONS: Self-reported conflicts of interest are common in implant-based breast reconstruction research. Studies authored by groups with conflicts of interest are significantly associated with reporting lower surgical complications and therefore describing positive research findings, especially when industry-marketed products are being used in the study. CLINICAL QUESTION/LEVEL OF EVIDENCE: Therapeutic, III.

SPLIT rectus abdominis myocutaneous double free flap for extremity reconstruction.

A Mathes and Nahai type III muscle, such as the rectus abdominis muscle, can be utilized to cover two separate wounds simultaneously utilizing its dual blood supply thereby minimizing donor site morbidity and operative time. We report a case for treatment of bilateral Gustillo type IIIB lower extremity injuries treated with a single rectus abdominis muscle split into two free flaps, with one based on the deep inferior epigastric vessels and one on the superior epigastric vessels to cover the contralateral wound. In our patient, both lower extremity wounds were covered with muscle flaps from the same donor site in a single operation, salvaging both limbs with progression to unassisted ambulatory status. We show in this case report that the utilization of the vascular anatomy of the rectus muscle allows for division of the flap into two flaps, permitting preservation of the contralateral abdominal wall integrity and coverage of two wounds with a single muscle.

Low-level laser therapy for fat layer reduction: a comprehensive review.

BACKGROUND AND OBJECTIVE: Low-level laser (light) therapy (LLLT) is a noninvasive, nonthermal approach to disorders requiring reduction of pain and inflammation and stimulation of healing and tissue regeneration. Within the last decade, LLLT started being investigated as an adjuvant to liposuction, for noninvasive body contouring, reduction of cellulite, and improvement of blood lipid profile. LLLT may also aid autologous fat transfer procedures by enhancing the viability of adipocytes. However the underlying mechanism of actions for such effects still seems to be unclear. It is important, therefore, to understand the potential efficacy and proposed mechanism of actions of this new procedure for fat reduction. MATERIALS AND METHODS: A review of the literature associated with applications of LLLT related to fat layer reduction was performed to evaluate the findings from pre-clinical and clinical studies with respect to the mechanism of action, efficacy, and safety. RESULTS: The studies as of today suggest that LLLT has a potential to be used in fat and cellulite reduction as well as in improvement of blood lipid profile without any significant side effects. One of the main proposed mechanism of actions is based upon production of transient pores in adipocytes, allowing lipids to leak out. Another is through activation of the complement cascade which could cause induction of adipocyte apoptosis and subsequent release of lipids. CONCLUSION: Although the present studies have demonstrated safety and efficacy of LLLT in fat layer reduction, studies demonstrating the efficacy of LLLT as a stand-alone procedure are still inadequate. Moreover, further studies are necessary to identify the mechanism of action.

High-throughput assay for bacterial adhesion on acellular dermal matrices and synthetic surgical materials.

BACKGROUND: There has been increasing use of synthetic and acellular dermal matrix materials in surgery, ranging from breast reconstruction to hernia repairs. There is a paucity of data on how acellular dermal matrix compares with other surgical materials as a substrate for bacterial adhesion, the first step in formation biofilm, which occurs in prosthetic wound infections. The authors have designed a high-throughput assay to evaluate Staphylococcus aureus adherence on various synthetic and biologically derived materials. METHODS: Clinical isolates of S. aureus (strains SC-1 and UAMS-1) were cultured with different materials, and bacterial adherence was measured using a resazurin cell vitality assay. Four materials that are commonly used in surgery were evaluated: Prolene mesh, Vicryl mesh, and two different acellular dermal matrix preparations (AlloDerm and FlexHD). The authors were able to develop a high-throughput and reliable assay for quantifying bacterial adhesion on synthetic and biologically derived materials. RESULTS: The resazurin vitality assay can be reliably used to quantify bacterial adherence to acellular dermal matrix material and synthetic material. S. aureus strains SC-1 and UAMS-1 both adhered better to acellular dermal matrix materials (AlloDerm versus FlexHD) than to the synthetic material Prolene. S. aureus also adhered better to Vicryl than to Prolene. Strain UAMS-1 adhered better to Vicryl and acellular dermal matrix materials than did strain SC-1. CONCLUSIONS: The results show that S. aureus adheres more readily to acellular dermal matrix material than to synthetic material. The resazurin assay provides a standard method for evaluating surgical materials with regard to bacterial adherence and potential propensity for biofilm development.

Patient satisfaction in postmastectomy breast reconstruction: a comparative evaluation of DIEP, TRAM, latissimus flap, and implant techniques.

BACKGROUND: Despite a growing literature on patient satisfaction in breast reconstruction, few studies have compared perforator flaps with the more commonly practiced methods. The authors compared four reconstructive techniques and identified factors influencing patient satisfaction. METHODS: All patients undergoing postmastectomy breast reconstruction between 1999 and 2006 at a single academic institution were included in our study. A total of 583 patients with tissue expander/implant, latissimus, pedicle transverse rectus abdominis muscle (TRAM), and deep inferior epigastric perforator (DIEP) flap reconstructions received a validated questionnaire on satisfaction, health-related quality of life, and sociodemographic data. RESULTS: Patient response was 75 percent, with 439 completed questionnaires including 87 tissue expander/implant, 116 latissimus, and 119 pedicle TRAM and 117 DIEP flap patients. DIEP patients had the highest level of general satisfaction at 80 percent, and pedicle TRAM patients had the highest level of aesthetic satisfaction at 77 percent (p < 0.001 and p < 0.001, respectively). Health-related quality of life and length of time since surgery were identified as significant covariates influencing patient satisfaction. After logistic regression analysis, autologous reconstruction had significantly higher general and aesthetic satisfaction than implant-based reconstruction (p = 0.017 and p < 0.001). Among the autologous reconstructions, abdominal-based flaps had significantly higher general and aesthetic satisfaction than latissimus flaps (p = 0.011 and p = 0.016). When comparing the abdominal-based reconstructions, general and aesthetic satisfaction were no longer statistically significant between pedicle TRAM and DIEP flaps (p = 0.659 and p = 0.198). CONCLUSIONS: Autologous, abdominal-based reconstructions had the highest satisfaction rates across all four groups. After logistic regression analysis, differences in patient satisfaction between pedicle TRAM and DIEP flap reconstruction were no longer observed. Discussing satisfaction outcomes with patients will help them make educated decisions about breast reconstruction.