Facial transplantation surgery

A Novel Approach to Peripheral Nerve Regeneration: Local FK-506 Delivery Using a Reservoir Flap Model

PURPOSE

Peripheral nerve injuries can lead to lasting functional impairments, impacting movement and quality of life. FK-506, a widely used immunosuppressant, has demonstrated potential in promoting nerve regeneration in addition to its immunosuppressive effects. This study investigates the use of a local reservoir flap to deliver FK-506 directly to the nerve injury site, aiming to enhance nerve regeneration while minimizing systemic immunosuppression.

MATERIALS AND METHODS

Sciatic nerve injuries were surgically induced in 24 rats, which were divided into control, 0.5 mg/kg FK-506 (Exp 1), and 2.0 mg/kg FK-506 (Exp 2) groups. A superficial inferior epigastric artery flap served as a reservoir for FK-506, allowing direct delivery to the injury site. FK-506 was administered intermittently over a 4-week period. Outcomes included the Sciatic Functional Index (SFI), muscle recovery (width and weight), nerve morphology, expression of neurogenic markers such as GDNF, immune cell counts, and body weight.

RESULTS

Exp 1 (0.5 mg/kg) demonstrated significant improvements in SFI, GDNF expression, and muscle width compared to the control and high-dose groups. These findings suggest that FK-506 administration via a reservoir flap, particularly at a lower dose, supports effective nerve regeneration. Additionally, FK-506 treatment did not result in significant changes in immune cell profiles or body weight, indicating minimal systemic effects.

CONCLUSION

Localized FK-506 administration via a reservoir flap effectively enhances peripheral nerve regeneration and minimizes systemic immunosuppression, making it a promising approach for clinical application in treating peripheral nerve injuries.

Immunogenicity and tolerance induction in vascularized composite allotransplantation

Vascularized composite allotransplantation (VCA) is the transplantation of multiple tissues such as skin, muscle, bone, nerve, and vessels, as a functional unit (i.e., hand or face) to patients suffering from major tissue trauma and functional deficits. Though the surgical feasibility has been optimized, issues regarding graft rejection remains. VCA rejection involves a diverse population of cells but is primarily driven by both donor and recipient lymphocytes, antigen-presenting cells, macrophages, and other immune as well as donor-derived cells. In addition, it is commonly understood that different tissues within VCA, such as the skin, elicits a stronger rejection response. Currently, VCA recipients are required to follow potent and lifelong immunosuppressing regimens to maximize graft survival. This puts patients at risk for malignancies, opportunistic infections, and cancers, thereby posing a need for less perilous methods of inducing graft tolerance. This review will provide an overview of cell populations and mechanisms, specific tissue involved in VCA rejection, as well as an updated scope of current methods of tolerance induction.

One Year Experience of the Hand Allotransplantation First Performed after Korea Organ Transplantation Act (KOTA) Amendment

The revision of the Korea Organ Transplantation Act (KOTA) in 2018 included hand/arm among the organs that can be transplanted. The first hand transplantation since the revision of KOTA took place in January 2021. A 62-year-old male patient experienced hand amputation on July 13, 2018, by a catapult injury. The patient first visited our institute 3 months after the injury. After serial interviews and an overall evaluation, the patient was registered on the hand transplantation waiting list in January 2020. On January 9, 2021, the patient underwent hand transplantation at the right distal forearm level. The total operation time was 17 hours 15 minutes, and the cold ischemic time was 4 hours 9 minutes. Postoperative immunosuppression was administered based on the protocol used for kidney transplantation. Two acute rejection episodes occurred, on postoperative days 33 and 41. Both rejection episodes were reversible with rescue therapy of a higher tacrolimus trough level, steroid pulse therapy, and topical immunosuppressants. Controlled passive range of motion exercise was started on postoperative day 10. Dynamic splint was applied on postoperative day 18. At 1 year, graft maintenance and functional improvement were satisfactory, and the patient showed a Disabilities of Arm, Shoulder and Hand score of 25.8. We successfully performed the first hand transplantation surgery under the KOTA amendment. It came from the organic and effective cooperation of plastic, orthopaedic, and transplantation departments and we believe it will guarantee the future ongoing success.

Self-inflicted craniomaxillofacial gunshot wounds: management, reconstruction, and outcomes

Suicide by firearm remains one of the leading causes of violence-related injury death in the United States each year. The mortality rate from these injuries is high, resulting in a paucity of outcome data in the literature regarding injuries to the maxillofacial region. This has largely been attributed to a lack of funding for research in this area compared to other leading causes of mortality in the United States. The aim of this study was to detail the authors' experience and approach to complex maxillofacial reconstruction using both local reconstructive methods and microvascular free tissue transfer. A retrospective cohort study was designed, including patients who sustained self-inflicted gunshot wounds to the maxillofacial region between January 1, 2012 and May 1, 2020. Forty-one patients met the inclusion criteria. The majority of the patients were male (87.8%). Mean patient age was 44.2 ± 16.6 years. Alcohol or drugs, and a psychiatric history were present in a majority of the cases. The most involved anatomical region was the midface (75.6% of cases). Seven patients required free tissue transfer for reconstruction, with many needing multiple flaps. Self-inflicted gunshot wounds represent challenging reconstruction scenarios, often in the setting of severe psychological trauma, and require a multidisciplinary team to ensure the optimal outcome.

Optimizing the decellularization process of human maxillofacial muscles for facial reconstruction using a detergent-only approach

Trauma, congenital diseases, and cancer resection cause muscle deformities of the human facial muscle. Muscle defects are either treated with local or distal flaps if direct closure is not possible. However, such surgical interventions are limited by donor morbidity and limited tissue availability. Decellularized scaffolds provide alternative strategies for replacing and restoring missing facial muscle by creating scaffolds that mimic the native tissue. This study aimed to develop a protocol to decellularize human zygomaticus major muscle (ZMM) and masseter muscle (MM). Three protocols were assessed including a detergent-only treatment (DOT), detergent-enzymatic treatment (DET) protocol, and a third nondetergent nonenzymatic treatment protocol. Scaffolds were then characterized via histological, immunofluorescent, and quantitative techniques to assess which protocol provided optimal decellularization and maintenance of the extracellular matrix (ECM). The results demonstrated three cycles of DOT protocol consisting of 2% sodium dodecyl sulfate for 4 hr was optimal for decellularization for both ZMM and MM. After three cycles, DNA content was significantly reduced compared with native ZMM and MM (p < .05) with preservation of collagen and glycosaminoglycan content and ECM on histological analysis. DET and nondetergent nonenzymatic treatment protocols were unsuccessful in decellularizing the ZMM and MM with residual DNA content after four cycles and caused ECM disruption on histological analysis. All protocols did not impair the mechanical properties and supported human fibroblast growth. In conclusion, the DOT protocol is effective in producing human decellularized muscle scaffolds that maintain the ECM. Further investigation of detergent only decellurization techniques should be explored as a first step to create effective scaffolds for muscle tissue engineering.

The Face Transplantation Update: 2016

BACKGROUND

Ten years after the first face transplantation, the available data in peer-reviewed literature, various media outlets, and recent specialty meetings and courses are conflicting and inconsistently reported. The purpose of this study was to consolidate the available data by means of multiple sources to reflect an accurate and current state of facial vascularized composite allotransplantation as of December of 2015.

METHODS

Using applied search terms pertaining to face transplantation, a systematic PubMed search, Google search, and review of Plastic Surgery Education Network News Connection e-mailed newsletters were performed, and data presented at three meetings (i.e., the most recent American Society of Reconstructive Transplantation biennial meeting, the American Society of Reconstructive Microsurgery annual meeting, and the biennial AO North America State of the Art: Face Reconstruction and Transplantation course) were consolidated to capture the most contemporary and accurate data in face transplantation.

RESULTS

A total of 37 face transplants have been performed (20 partial and 17 full face) from 2005 to December of 2015. A discrepancy between actual transplantations performed and peer-reviewed reports exists at multiple time points, with a propensity for underreporting. Ten cases were described through media outlets but were not reported by the surgical teams in peer-reviewed literature. Two clinical cases were not described in peer-reviewed literature or media. There have been a total of five deaths, and posttransplant malignancy and revision surgery have been underreported.

CONCLUSIONS

This serves as the most contemporary and all-inclusive face transplantation review. There is a critical need for timely reporting and outcome transparency in the reconstructive transplant community.

CLINICAL QUESTION/LEVEL OF EVIDENCE

Therapeutic, V.

A review of the world's published face transplant cases: ethical perspectives

The highly publicised case of the first ever partial facial transplant in 2005 sparked fierce ethical debates, moral arguments and strong opinions, both within the medical community as well as the general public and mass media. As more patients have undergone facial transplantation over the last decade, some of this initial scepticism has given way to a wider acceptance of this significant reconstructive development. However, despite an improved understanding of the perioperative technicalities and postoperative perils, the risks remain significant and the long-term outcomes are still largely unknown. This article examines the major ethical challenges that have accompanied facial allo-transplantation since its inception. We discuss these ethical dilemmas in the context of the patients, donor families, healthcare professionals and society as a whole, while evaluating some of the emerging evidence and outcomes associated with the physical and psycho-emotional risks linked to this procedure.

A Comprehensive Strategy for Reconstruction of a Missing Midface

The loss of midface structures always leads to significant functional and cosmetic deficits, and the reconstruction work remains a challenge for surgeons. We report a rare case with severe midfacial defects involving the maxilla, nasal bone, and zygoma. This patient was treated with a comprehensive approach that included distraction osteogenesis, computer-aided surgery, a fibula bone graft, dental implantation, orthognathic surgery, and rhinoplasty. The treatment procedures required 4 years to complete, and a dramatically improved facial contour and stable occlusion were achieved. The results demonstrated the importance of a multidisciplinary approach and computer-aided design when treating severe maxillofacial deformities. Other important elements of the treatment process were the meticulous physical examination, the selection of an optimal treatment sequence, the skill of the surgeons, and more importantly, the patient-oriented mindset.

Stem cell and research in plastic surgery

Regenerative medicine using stem cells has progressed significantly over the last decade. Plastic surgeons historically have used tissues of human being to restore various defect sites and utilized a single cell lines for the tissue regeneration. The cell sources (autologous or allogeneic), cell types (embryonic stem cell or adult stem cell), and source of tissues (bone marrow, muscle, adipose, cartilage, or blood) are very important for stem cell-based tissue coverage. Embryonic stem cells are pluripotent precursors obtained from the inner cell mass of the blastocyst and reported to be used for preventing muscle atrophy after peripheral nerve injury. Multipotent adult stem cells are easily accessed for plastic surgeons during many routine procedures. This article briefly review the current state of overall stem cell research and clinical applications in the plastic surgical field.