Determining Chin Dimensions for Feminizing Genioplasty: An Anatomic Study.

BACKGROUND: Feminizing genioplasty warrants chin modification to achieve feminine characteristics. This study compared female and male facial skeletal dimensions and shape to guide feminizing genioplasty. METHODS: Skulls stored at the Cleveland Museum of Natural History were analyzed. Sex, age, and race were documented. Heights and widths of the face and chin were measured, normalized, and compared. RESULTS: Forty-three male (43.58±12.52-y-old) and 43 female (40.48±12.04-y-old) skulls were included. Within each group, 25 skulls were of African American (AA) origin and 18 were of Caucasian (C) origin. Absolute chin heights were larger in AA and C males compared with females (P<0.05). After normalization to lower facial height, there was a trend toward greater chin height in AA males compared with females (P=0.07). Parasagittal chin width in AA males was significantly larger than AA females (P=0.0006). Interforaminal chin width in C males trended toward being significantly larger than females (P=0.08). Following normalization of chin widths, no significant sex-based differences were noted for AA skulls except for the interforaminal/intergonial ratio, which was smaller in AA males (P=0.04). For C skulls, most normalized ratios were significantly smaller in males (P<0.05). C females had wider angles at the point of maximum chin projection (P=0.007) and wider symphyseal inclinations (P<0.0001). These differences were not present in AA skulls (P>0.05). Regardless of race, male chins appeared square, whereas female chins were round. CONCLUSIONS: While chin width reduction is not needed for most patients, height reduction could be considered. Chin contouring is the most central component of feminizing genioplasty.

An Update on the Survival of the First 50 Face Transplants Worldwide.

Importance: Since 2005, a total of 50 face transplants have been reported from 18 centers in 11 countries. The overall survival of the grafts has not yet been established. Objective: To assess the survival of the face transplant grafts and evaluate factors potentially influencing it. Design, Setting, and Participants: Data on all the transplants included in this multicenter cohort study were collected at participating transplant centers for updated nonpublished data, supplemented with literature review for nonparticipating centers. Data from 2005 until September 2023, were included. Data were analyzed from November 11, 2005, through September 18, 2023. Patients included the first 50 patients in the world to have received a face transplant. Exposure: Face transplant graft. Main Outcomes and Measures: The primary outcome was the overall survival of the face transplant graft, defined as either transplant loss or patient death. The secondary outcome was the number of acute rejection episodes per year. Results: The 50 transplants were performed on 39 men (81%) and 9 women (19%) with a median age of 35 (range, 19-68) years at the time of the transplant. The median follow-up time was 8.9 (range, 0.2-16.7) years. During the follow-up, 6 transplants were lost with 2 patients retransplanted. There were 10 patients who died, 2 of whom had lost a transplant. The 5- and 10-year survival of the transplants was 85% (SD, 5%) and 74% (SD, 7%), respectively. The sequential number of the transplant in the world was a significant predictor of survival (hazard ratio, 95; 95% CI, 90-100; P < 05). The median number of acute rejection episodes per year was 1.2 (range, 0-5.3) for the transplants that were lost and 0.7 (range, 0-4.6) for the transplants that survived. No correlation with patient and transplant variables was detected for either the transplant survival or the number of rejection episodes. Conclusions and Relevance: In this study, the overall survival of the face transplants is encouraging. These data suggest that the acceptable long-term survival of face transplants makes them a reconstructive option for extensive facial defects.

High-Density Porous Polyethylene Implant Cranioplasty: A Systematic Review of Outcomes.

Porous polyethylene has been widely used in craniofacial reconstruction due to its biomechanical properties and ease of handling. The objective of this study was to perform a systematic review of the literature to summarize outcomes utilizing high-density porous polyethylene (HDPP) implants in cranioplasty. A literature search of PubMed, Cochrane Library, and Scopus databases was conducted to identify original studies with HDPP cranioplasty from inception to March 2023. Non-English articles, commentaries, absent indications or outcomes, and nonclinical studies were excluded. Data on patient demographics, indications, defect size and location, outcomes, and patient satisfaction were extracted. Summary statistics were calculated using weighted averages based on the available reported data. A total of 1089 patients involving 1104 cranioplasty procedures with HDPP were identified. Patients' mean age was 44.0 years (range 2 to 83 y). The mean follow-up duration was 32.0 months (range 2 wk to 8 y). Two studies comprising 17 patients (1.6%) included only pediatric patients. Alloplastic cranioplasty was required after treatment of cerebrovascular diseases (50.9%), tumor excision (32.0%), trauma (11.4%), trigeminal neuralgia/epilepsy (3.4%), and others such as abscesses/cysts (1.4%). The size of the defect ranged from 3 to 340 cm 2 . An overall postoperative complication rate of 2.3% was identified, especially in patients who had previously undergone surgery at the same site. When data were available, contour improvement and high patient satisfaction were reported in 98.8% and 98.3% of the patients. HDPP implants exhibit favorable outcomes for reconstruction of skull defects. Higher complication rates may be anticipated in secondary cranioplasty cases.

Efficacy of virtual plastic surgery encounters in establishment of care and surgical conversion.

BACKGROUND: The efficacy of virtual visits in converting new patients into established patients undergoing surgical treatment has not been demonstrated. The aim of this study was to evaluate patient retention and surgical conversion rate after an initial virtual plastic surgery consultation. METHODS: An IRB-approved retrospective review of all new plastic surgery patients seen between May and August 2020 at a single institution was conducted. The initial encounter type, chief complaint, demographics, treatment recommendation, insurance approval rate, number and modality of pre- and postoperative visits, time to procedure, follow up, and complications were recorded. Patient retention and surgery conversion rate were calculated. Statistical analysis was performed with Chi-squared test, Fisher's exact test, and unpaired t-test. RESULTS: In total, the records of 1889 new patients were reviewed (1635 in-person, 254 virtual). Virtual patients were younger (44.5 ±â€¯19.0 versus 49.5 ±â€¯20.7 years, p < 0.001), and nearly half resided greater than 50 miles away (42% versus 16%, p < 0.001). Virtual patients more frequently presented for cosmetic surgery (14% versus 7%, p < 0.001), lymphedema (15% versus 3%, p < 0.001), and gender dysphoria (11% versus 2%, p < 0.001). In-person patients presented more often for trauma (18% versus 5%, p < 0.001), elective hand complaints (16% versus 3%, p < 0.001), and breast reconstruction (9% versus 4%, p < 0.01). There were no differences in patient retention (p = 0.45) and procedure conversion rate (p = 0.21) between the groups. CONCLUSION: Telemedicine provides an opportunity to increase the practice catchment area and is as effective as in-person first encounters for establishing care and transition to surgery.

Temporalis Myofascial Flap and Conchal Bowl Cartilage Grafting for Temporomandibular Joint Arthritis.

Temporomandibular joint (TMJ) arthritis arises from a multitude of etiologies; however, there is no consensus definitive treatment. The complication profile of artificial TMJs is well known, and outcomes are variable and are reserved for salvage attempts. This case details a patient with persistent traumatic TMJ pain, arthritis, and single-photon emission computed tomography scan of potential nonunion. The present study reports on the first novel use of an alternative composite myofascial flap to help arthritic TMJ pain. This study details the successful use of a temporalis myofascial flap and conchal bowl autologous cartilage graft in posttraumatic TMJ degeneration.

Maxillary and Mandibular Healing After Facial Allotransplantation.

INTRODUCTION: Facial transplantation has emerged as a viable option in treating devastating facial injuries.Despite the high healing rate of Le Fort III and bilateral sagittal split osteotomies (BSSO) in nontransplant patients, few studies have reported assessment of maxillary and mandibular healing in face transplant patients compared with nontransplant patients. The aim of this study was to examine differences in bone healing in our patients. PATIENTS AND METHODS: A retrospective chart review was conducted of facial allotransplantation patients at the Cleveland Clinic from December 2008 to inception. Demographics such as age, date of birth, and sex were recorded. Additional variables included procedures, revisions, reoperations, medications, and bone stability and healing. Computed tomography (CT) images assessed the alignment of skeletal components, bony union quality, and stability of fixation. RESULTS: Three patients were included: 2 had Le Fort III segment transplantation, and 1 had transplantation of both a Le Fort III segment and mandibular BSSO. The Le Fort III segment in all patients exhibited mobility and fibrous union at the Le Fort III osteotomy on CT. In contrast, the BSSO healed uneventfully after transplantation and revision surgery, with bony union confirmed by both CT and histology of the fixation area between the donor and recipient mandible bilaterally. No patients with midfacial fibrous union required revision of the nonunion as they were clinically asymptomatic. CONCLUSION: Le Fort osteotomy demonstrates inferior healing in facial transplantation compared with the nontransplant population. In contrast, the successful healing in the mandible is likely owing to the high density of rich cancellous bone.

Real-time tissue perfusion assessment using fluorescence imaging topography scanning system: A preclinical investigation.

BACKGROUND AND OBJECTIVES: We previously developed a real-time fluorescence imaging topography scanning (RFITS) system for intraoperative multimodal imaging, image-guided surgery, and dynamic surgical navigation. The RFITS can capture intraoperative fluorescence, color reflectance, and surface topography concurrently and offers accurate registration of multimodal images. The RFITS prototype is a promising system for multimodal image guidance and intuitive 3D visualization. In the current study, we investigated the capability of the RFITS system in intraoperative fluorescence vascular angiography for real-time assessment of tissue perfusion. STUDY DESIGN/MATERIALS AND METHODS: We conducted ex vivo imaging of fluorescence perfusion in a soft casting life-sized human brain phantom. Indocyanine green (ICG) solutions diluted in dimethyl sulfoxide (DMSO) and human serum were injected into the brain phantom through the vessel simulating tube (2 ± 0.2 mm inner diameter) by an adjustable flow peristaltic pump. To demonstrate the translational potential of the system, an ICG/DMSO solution was perfused into blood vessels of freshly harvested porcine ears (n = 9, inner diameter from 0.56 to 1.27 mm). We subsequently performed in vivo imaging of fluorescence-perfused vascular structures in rodent models (n = 10). 5 mg/ml ICG solutions prepared in sterile water were injected via the lateral tail vein. All targets were imaged by the RFITS prototype at a working distance of 350-400 mm. RESULTS: 3D visualization of 10 µg/ml ICG-labeled continuous moving serum in the brain phantom was obtained at an average signal-to-background ratio (SBR) of 1.74 ± 0.03. The system was able to detect intravenously diffused fluorescence in porcine tissues with an average SBR of 2.23 ± 0.22. The RFITS prototype provided real-time monitoring of tissue perfusion in rats after intravenous (IV) administration of ICG. The maximum fluorescence intensity (average SBR = 1.94 ± 0.16, p < 0.001) was observed at Tpeak of ~30 seconds after the ICG signal was first detected (average SBR = 1.19 ± 0.13, p < 0.01). CONCLUSIONS: We have conducted preclinical studies to demonstrate the feasibility of applying the RFITS system in real-time fluorescence angiography and tissue perfusion assessment. Our system provides fluorescence/color composite images for intuitive visualization of tissue perfusion with 3D perception. The findings pave the way for future clinical translation.

Applications of multispectral and hyperspectral imaging in dermatology.

Vision is essential in the diagnostic capabilities in the speciality of dermatology. However, humans are limited in colour vision by the trichromatic visual system that we possess. Multispectral and hyperspectral imaging can overcome this limitation and non-invasively provide novel information about a skin lesion at the cellular level. A literature review from January 2019 to March 2021 for hyperspectral and multispectral imaging in the field of dermatology was conducted. Multispectral/Hyperspectral imaging continues to generate significant research and interest in dermatology. Much of this research is on distinguishing melanoma from benign nevi as this could allow for a diagnosis without biopsy. In addition, adding multispectral/hyperspectral imaging to smartphones is being researched in order to create a portable and low-cost device that can be used in remote areas. One of the limitations in developing devices utilizing hyperspectral imaging has been a sacrifice in specificity in order to maximize sensitivity. Potential solutions to combat this that are being researched include combining multispectral/hyperspectral imaging with other imaging modalities such as photoacoustic imaging in order to overcome the limitations of using each individually. Multispectral/Hyperspectral imaging could be an instrumental aid for clinicians in examining, diagnosing and developing the management plan for patient's skin lesions.

Two Decades of Hand Transplantation: A Systematic Review of Outcomes.

ABSTRACT: Hand transplantation for upper extremity amputation provides a unique treatment that restores form and function, which may not be achieved by traditional reconstruction and prosthetics. However, despite enhancing quality of life, hand transplantation remains controversial, because of immunological complications, transplant rejection, and medication effects. This systematic literature review sought to collect information on current experiences and outcomes of hand transplants to determine the efficacy and utility of hand transplants. The databases PubMed, Scopus, and Embase were analyzed with combinations of "hand" or "upper extremity" or "arm" and "transplant" or "allograft," with information collected on recipient characteristics, details of transplant, immunological outcomes, functional outcomes, and complications. Functional outcomes, as measured by Disabilities of Arm, Shoulder and Hand score, were compared between patient groups using Wilcoxon signed-rank test or 1-way analysis of variance test and post hoc Tukey test. Within the 108 articles that fulfilled inclusion and exclusion criteria, there were 96 patients with 148 hand transplants. There were 57 patients who experienced acute rejection and 5 patients with chronic rejection. Disabilities of the Arm, Shoulder and Hand scores significantly decreased after hand transplantation and were significantly lower for distal transplants compared with proximal transplants. There were 3 patients with concurrent face transplantation and 2 patients with simultaneous leg transplants. Sixteen patients experienced amputation of the hand transplant, and there were 5 deaths. This study found that hand transplantation provides significant restoration of function and form, especially for proximal transplants. Reduction in complications, such as rejection and amputation, can be achieved by decreasing medication cost and patient education.

Repair Sequence and Management of the Premaxilla in Patients With Bilateral Cleft Lip and Palate: A Systematic Review of the Literature.

BACKGROUND: Bilateral cleft lip and palate (BCLP) remains a difficult surgical problem due to the severely protruding premaxillary segment, with no consensus of optimal treatment sequence in older patients. A systematic review of the literature was performed to assess the current status of BCLP repair based on age. METHODS: A PRISMA systematic review of the PubMed, Web of Science, and Embase databases was performed using a series of search terms related to BCLP. Studies were categorized based on the age of presentation, repair sequence, and technique. RESULTS: The database search identified 381 articles. Of these, 72 manuscripts were ultimately included. The lip was repaired first in 1077 patients (86.0%), palate first in 161 patients (12.9%), and simultaneous lip and palate in 14 patients (1.1%). Patients less than 6 months old received lip repair first (n = 959, 98.6%), with complications of unaesthetic appearance (n = 86, 62.3%) and midface retrusion (n = 41, 34.1%) in younger patients and wound dehiscence (n = 8, 40%) in older patients. Primary lip repair was preceded by presurgical orthopedics (n = 760) or lip adhesion (n = 272) to reduce lip tension with nasoalveolar molding (n = 452, 62.9%) or the Latham device (n = 282, 37.1%). In older patients, the palate was repaired first or premaxillary setback (n = 222) was indicated in protruded premaxillae greater than 10 mm, but carried the risk of premaxilla mobility (n = 20, 37.7%) and midface retrusion (n = 10, 18.9%). CONCLUSION: In younger patients, lip repair is performed first with preoperative orthopedics or lip adhesion. In older patients, the palate is more commonly repaired first compared with the lip; however, there is no difference in complication rate.

Ex vivo normothermic preservation of amputated limbs with a hemoglobin-based oxygen carrier perfusate.

BACKGROUND: Ex vivo normothermic limb perfusion (EVNLP) preserves amputated limbs under near-physiologic conditions. Perfusates containing red blood cells (RBCs) have shown to improve outcomes during ex vivo normothermic organ perfusion, when compared with acellular perfusates. To avoid limitations associated with the use of blood-based products, we evaluated the feasibility of EVNLP using a polymerized hemoglobin-based oxygen carrier-201 (HBOC-201). METHODS: Twenty-four porcine forelimbs were procured from Yorkshire pigs. Six forelimbs underwent EVNLP with an HBOC-201-based perfusate, six with an RBC-based perfusate, and 12 served as static cold storage (SCS) controls. Ex vivo normothermic limb perfusion was terminated in the presence of systolic arterial pressure of 115 mm Hg or greater, fullness of compartments, or drop of tissue oxygen saturation by 20%. Limb contractility, weight change, compartment pressure, tissue oxygen saturation, oxygen uptake rates (OURs) were assessed. Perfusate fluid-dynamics, gases, electrolytes, metabolites, methemoglobin, creatine kinase, and myoglobin concentration were measured. Uniformity of skin perfusion was assessed with indocyanine green angiography and infrared thermography. RESULTS: Warm ischemia time before EVNLP was 35.50 ± 8.62 minutes (HBOC-201), 30.17 ± 8.03 minutes (RBC) and 37.82 ± 10.45 (SCS) (p = 0.09). Ex vivo normothermic limb perfusion duration was 22.5 ± 1.7 hours (HBOC-201) and 28.2 ± 7.3 hours (RBC) (p = 0.04). Vascular flow (325 ± 25 mL·min-1 vs. 444.7 ± 50.6 mL·min-1; p = 0.39), OUR (2.0 ± 1.45 mL O2·min-1·g-1 vs. 1.3 ± 0.92 mL O2·min-1·g-1 of tissue; p = 0.80), lactate (14.66 ± 4.26 mmol·L-1 vs. 13.11 ± 6.68 mmol·L-1; p = 0.32), perfusate pH (7.53 ± 0.25 HBOC-201; 7.50 ± 0.23 RBC; p = 0.82), flexor (28.3 ± 22.0 vs. 27.5 ± 10.6; p = 0.99), and extensor (31.5 ± 22.9 vs. 28.8 ± 14.5; p = 0.82) compartment pressures, and weight changes (23.1 ± 3.0% vs. 13.2 ± 22.7; p = 0.07) were not significantly different between HBOC-201 and RBC groups, respectively. In HBOC-201 perfused limbs, methemoglobin levels increased, reaching 47.8 ± 12.1% at endpoint. Methemoglobin saturation did not affect OUR (ρ = -0.15, r2 = 0.022; p = 0.45). A significantly greater number of necrotic myocytes was found in the SCS group at endpoint (SCS, 127 ± 17 cells; HBOC-201, 72 ± 30 cells; RBC-based, 56 ± 40 cells; vs. p = 0.003). CONCLUSION: HBOC-201- and RBC-based perfusates similarly support isolated limb physiology, metabolism, and function.

Consensus Conference Statement on the General Use of Near-infrared Fluorescence Imaging and Indocyanine Green Guided Surgery: Results of a Modified Delphi Study.

BACKGROUND: In recent decades, the use of near-infrared light and fluorescence-guidance during open and laparoscopic surgery has exponentially expanded across various clinical settings. However, tremendous variability exists in how it is performed. OBJECTIVE: In this first published survey of international experts on fluorescence-guided surgery, we sought to identify areas of consensus and nonconsensus across 4 areas of practice: fundamentals; patient selection/preparation; technical aspects; and effectiveness and safety. METHODS: A Delphi survey was conducted among 19 international experts in fluorescence-guided surgery attending a 1-day consensus meeting in Frankfurt, Germany on September 8th, 2019. Using mobile phones, experts were asked to anonymously vote over 2 rounds of voting, with 70% and 80% set as a priori thresholds for consensus and vote robustness, respectively. RESULTS: Experts from 5 continents reached consensus on 41 of 44 statements, including strong consensus that near-infrared fluorescence-guided surgery is both effective and safe across a broad variety of clinical settings, including the localization of critical anatomical structures like vessels, detection of tumors and sentinel nodes, assessment of tissue perfusion and anastomotic leaks, delineation of segmented organs, and localization of parathyroid glands. Although the minimum and maximum safe effective dose of ICG were felt to be 1 to 2 mg and >10 mg, respectively, there was strong consensus that determining the optimum dose, concentration, route and timing of ICG administration should be an ongoing research focus. CONCLUSIONS: Although fluorescence imaging was almost unanimously perceived to be both effective and safe across a broad range of clinical settings, considerable further research remains necessary to optimize its use.

Artificial intelligence image recognition of melanoma and basal cell carcinoma in racially diverse populations.

BACKGROUND: Artificial intelligence (AI) image recognition models have been relatively successful in diagnosing cutaneous manifestations in individuals with light skin tone. However, when these models are tested on the same cutaneous manifestations in individuals with darker or brown skin tone, the performance of the model drops due to a paucity of such images available for model training. OBJECTIVE: The objective of this study was to improve the performance of AI models in recognizing cutaneous diseases in individuals with darker skin tone. METHODS: Unsupervised computer darkening of skin color with preservation of the dermatological disease/lesion characteristics in images of light-skinned individuals with basal cell carcinoma (BCC), and melanoma was performed. RESULTS: Training an AI model on these artificially "darkened" images as compared to training on the original "light-skinned" images resulted in a higher sensitivity, specificity, positive predictive value, negative predictive value, F1 score and area under the receiver-operating characteristic curve of the AI model in differentiating between BCC and melanoma in individuals with brown skin tone. CONCLUSION: Use of unsupervised image to image translation in medical AI image recognition models has the potential to significantly improve their accuracy in diagnosing diseases in individuals with racially diverse skin tone.

Successful Treatment of Life-Threatening COVID-19 Infection in a Face Transplant Recipient.

ABSTRACT: Recent literature suggests that severe COVID-19 is associated with an exaggerated immune response during viral infection, resulting in cytokine storm. Although elevated plasma interleukin 6 (IL-6) has been reported in severe COVID-19 infections, and treatment with anti-IL-6 (tocilizumab) has demonstrated promising outcomes both domestically and abroad, reports remain limited and therapeutic regimens vary considerably. Furthermore, research pertaining to transplant recipients, COVID-19 infection, and anti-IL-6 therapy remains underdeveloped. Herein, we report the successful treatment of the only reported facial vascularized composite allograft (VCA) recipient who contracted severe COVID-19 and the first reported VCA recipient with COVID-19 infection that received anti-IL-6 immunotherapy resulting in an excellent recovery despite his multiple preexisting and COVID-19-related comorbidities-adult respiratory distress syndrome, acute renal failure requiring hemodialysis, and concomitant sepsis due to extensive drug-resistant bacterial pneumonia upon presentation. To date, he has not demonstrated any anti-IL-6 drug-related adverse effects. This preliminary report also suggests that our immunosuppressed VCA patients can indeed demonstrate a robust cytokine response during COVID-19 infection and may also respond favorably to emerging anticytokine immune therapies. We hope that our experience proves helpful to other centers that might encounter critically ill VCA recipients in the ongoing COVID-19 pandemic and in the years to follow.

Mixed Reality and 3D Printed Models for Planning and Execution of Face Transplantation.

OBJECTIVE: The aim of this study was to evaluate a novel holographic craniofacial surgical planning application and its implementation throughout the planning and operative stages of facial transplantation by performing a critical analysis of comparative utility, cost, and limitations of MR and 3D printing. SUMMARY OF BACKGROUND DATA: Face transplantation is a highly complex form of craniofacial reconstruction requiring significant planning, knowledge of patient-specific spatial relationships, and time-sensitive decision making. Computer-aided 3D modeling has improved efficiency and outcomes of complex craniofacial reconstruction by enabling virtual surgical planning and 3D printed model generation. MR technology can enhance surgical planning, improve visualization, and allow manipulation of virtual craniofacial biomodels within the operative field. METHODS: Accounting for the time-sensitive nature of face transplantation, a unique, highly coordinated workflow for image acquisition and processing was designed to facilitate rapid holographic rendering and 3D printing. During recent face transplantation, both holographic and 3D printed models were utilized, and the time and cost of fabrication were compared. RESULTS: Holographic models required less time and cost for fabrication. They provided both comprehensive visualization of 3D spatial relationships and novel means to perform VSP and virtual face transplantation by interacting with and manipulating patient-specific, anatomic holograms. CONCLUSION: Time efficiency, low-cost biomodel production, provision of unlimited preoperative surgical rehearsal, and potential for intraoperative surgical guidance makes holographic VSP and MR highly promising technology for use in complex craniofacial surgery.

Treatment Strategies of Complications of Breast Implants Associated With Ventriculoperitoneal Shunts: A Case Report and Review of the Literature.

ABSTRACT: Breast augmentation is among the most commonly performed cosmetic procedures in the United States. As these patients age or develop comorbidities, surgeons across many other disciplines will inevitably encounter these patients in their own practices. Consequently, surgeons must be aware of the potential interactions between breast implants and devices commonly used in their fields. This case, the second of its kind encountered by our own department, describes a woman who suffered one such interaction: migration and coiling of a ventriculoperitoneal shunt around her breast implant. A systematic review was conducted to characterize breast-related ventriculoperitoneal shunt complications reported in the literature and generate an algorithm for management of the most commonly reported scenarios. Recognition of potential complications will aid surgeons in appropriate operative planning and prevention of these adverse events.