Faculty Bibliography

INTRODUCTION:Radiation therapy is a promising modality for treating keloids after surgical excision. However, it is currently not standard practice among physicians because of concern surrounding the risk of radiation-induced secondary cancers, especially among pediatric patients. There is minimal research assessing the complications for radiation therapy in keloid management. AIM:The goal of this study was to determine radiation oncologists' perspectives about the utility and appropriateness of radiation therapy for keloid management in both adult and pediatric patients. This study also aimed to characterize radiation modality, dose, fractionation, and secondary complications observed by providers. METHODS:An electronic survey was delivered to 3102 members of the American Society for Radiation Oncology. The survey subjects were radiation oncologists who are currently practicing in the United States. Rates of responses were analyzed. RESULTS:A total of 114 responses from practicing radiation oncologists were received. Of these, 113 providers (99.1%) supported radiation therapy for keloid management in adults, whereas only 54.9% supported radiation therapy for pediatric patients. Of 101 providers that treated adults in the past year, the majority used external beam: electrons (84.2%), applied 3 fraction regimens (54.4%), and delivered radiation within 24 hours postexcision (45.5%). In pediatric patients, only 42 providers reported treating at least 1 patient. The majority used electron beam radiation (76.2%), applied 3 faction regimens (65%), and delivered radiation on the same day of keloid excision (50.0%) The main concern when treating pediatric patients were risk of secondary malignancy (92.1%). CONCLUSION:Although radiation therapy appears to be a widely accepted adjuvant treatment option for adults with keloids, the use of radiation therapy for pediatric patients is less widely accepted because of concerns regarding secondary malignancy. The findings suggest additional studies need to be carried out to assess the risk of those complications.

BACKGROUND/UNASSIGNED:The purpose of this study was to evaluate the association between timing of nerve repair and the ability to perform a primary nerve repair versus a bridge repair requiring the use of allograft, autograft, or a conduit in lacerated upper extremity peripheral nerve injuries. METHODS/UNASSIGNED:This is a retrospective case-control study of patients who underwent upper extremity nerve repair for lacerated peripheral nerves identified by Current Procedural Terminology codes. Timing of injury and surgery, as well as other information such as demographic information, mechanism of injury, site of injury, and type of nerve repair, was recorded. The odds of a patient requiring bridge repair based on the duration of time between injury and surgery was evaluated using logistic regression. RESULTS/UNASSIGNED:A total of 403 nerves in 335 patients (mean age 35.87 ± 15.33 years) were included. In all, 241 nerves were primarily repaired and 162 required bridge repair. Patients requiring bridge repair had a greater duration between injury and surgery compared with patients who underwent primary repair. Furthermore, the nerves requiring bridge repair were associated with a greater gap compared with the nerves repaired primarily. Based on logistic regression, each 1-day increase in duration between injury and surgery was associated with a 3% increase in the odds of requiring bridge repair. CONCLUSIONS/UNASSIGNED:There is no defined critical window to achieve a primary nerve repair following injury. This study demonstrated that nerve injuries requiring bridge repair were associated with a significantly greater delay to surgery.

BACKGROUND:Previous work has identified an association between de novo and transmitted loss-of-function mutations in genes under high evolutionary constraint with neurodevelopmental delays in nonsyndromic craniosynostosis (NSC). The authors sought to quantify the neurocognitive effect of these genetic lesions. METHODS:In a prospective, double-blinded cohort study, demographic surveys and neurocognitive tests were administered to patients recruited from a national sample of children with sagittal NSC. Scores for academic achievement, Full-Scale Intelligence Quotient (FSIQ), and visuomotor skills were directly compared between patients with and without damaging mutations in genes with a high probability of loss of function intolerance using two-tailed t tests. Analysis of covariance was also used to compare test scores while controlling for surgery type, age at surgery, and sociodemographic risk. RESULTS:Fifty-six patients completed neurocognitive testing, 18 of whom had a mutation in a highly constrained gene. There was no significant difference between groups in any sociodemographic factors. After controlling for patient factors, patients with high-risk mutations had poorer performance compared with patients without high-risk mutations in every testing category, with significant differences in FSIQ (102.9 ± 11.4 versus 110.1 ± 11.3; P = 0.033) and visuomotor integration (100.0 ± 11.9 versus 105.2 ± 9.5; P = 0.003). There were no significant differences in neurocognitive outcome when stratifying groups based on type of surgery or age at time of surgery. CONCLUSIONS:Even after controlling for exogenous factors, the presence of mutations in high-risk genes led to poorer neurocognitive outcomes. High-risk genotypes may predispose individuals with NSC to deficits, particularly in FSIQ and visuomotor integration. CLINICAL QUESTION/LEVEL OF EVIDENCE:Risk, II.

Background: Prophylactic nipple-sparing mastectomies (NSM) have become increasingly common, although there is little long-Term data on its efficacy in prevention of breast cancer. The objective of this study was to assess the incidence of breast cancer in a cohort of patients undergoing prophylactic NSM with a median follow-up of 10 years. Methods: Patients receiving prophylactic NSM at a single institution from 2006 to 2019 were included in a retrospective nature. Patient demographics, genetic mutations, operative details, and specimen pathology were recorded, and all postoperative patient visits and documentation were screened for cancer occurrence. Descriptive statics were performed where appropriate. Results: Two hundred eighty-four prophylactic NSMs were performed on 228 patients with a median follow-up of 120.5 ± 15.7 months. Roughly, a third of patients had a known genetic mutation, with 21% BRCA1 and 12% BRCA2. The majority (73%) of prophylactic specimens had no abnormal pathology. The most commonly observed pathologies were atypical lobular hyperplasia (10%) and ductal carcinoma in situ (7%). Cancer was identified in 10% of specimens, with only one case of lymphovascular invasion. Thus far, there have been no incidences of locoregional breast cancer occurrence in this cohort. Conclusions: The long-Term breast cancer occurrence rate in this cohort of prophylactic NSM patients at the time of this study is negligible. Despite this, continued surveillance of these patients is necessary until lifetime risk of occurrence following NSM has been established.

Purpose: Early onset of minor suture fusion in syndromic craniosynostosis is associated with midface dysplasia and is a common indication for craniofacial surgery. However, the potential effects of fusion severity on craniofacial growth patterns are not well understood. This study seeks to describe the impact of minor suture fusion severity on midface morphology in Crouzon syndrome. Methods: Pre-operative computed tomography images (CT) of 63 patients with Crouzon syndrome and 63 normocepahlic controls were included. Degree of suture fusion was assessed for the frontosphenoidal, sphenethmoidal, sphenosquamosal, sphenopetrosal, spheno-occipital synchondrosis, frontoethmoidal, and zygomaticosphenoidal sutures. Each suture was graded on a 5-point scale. The sella (S), nasion (N), A point (A), basion (BA), and anterior nasal spine (ANS) landmarks were used to calculate the SNA angle, BA-ANS length of the lower midface, and N-S length of the upper midface. Multiple linear regressions were used to analyze data. Results: The mean age was 43 months and 44% were female. The control group was significantly older (P <.01) than the patients with Crouzon syndrome. Advanced fusion of the spheno-occipital synchondrosis in Crouzon syndrome correlates with regression of the BA-ANS length by 0.563 mm per incremental increase in suture fusion (P <.01). Additionally, the lower midface (BA-ANS) was restricted to a greater degree than the upper midface (N-S) with progressive suture fusion in all patient types with ratios of these rates ranging between 0.602 and 0.89 for the 7 sutures analyzed. Suture fusion severity did not impact the SNA angle in any of the analyses performed. Conclusion: The severity of sheno-occipital synchondrosis fusion in Crouzon syndrome contributes to midface hypoplasia. Similarly, all anterior skull base sutures limited lower midface growth to a greater degree than the upper midface.

Background: Cephalic index (CI) is an objective measure of head shape used by craniofacial surgeons to support a diagnosis of head shape abnormality. However, the consensus on what values correspond to a normal head shape are changing following the Back to Sleep campaign. Recent work has shown an increase in mean CI from 74 to 84. Following this shift, no study has been undertaken to evaluate whether the perception of normal head shape has changed as well. Methods: About 1020 subjects, 18 or older, were recruited through Amazon Turk crowdsourcing platform. Subjects were asked to select the head shapes they considered most normal in a series of questions identifying ideal head shape in children 6 months or younger. Demographic information was recorded for study participants to identify differing ethnic perceptions of head shape. Results: The mean cephalic index preferred by a crowdsourced population was 81.84 (SD 2.48). There was a difference in mean preferred CI between people who identified as black (CI = 82.875) and people who identified as white (CI = 81.500; P =.00062). There was no difference in mean preferred CI between males and females. Education level, age healthcare occupation status, medical literacy, and work involving children did not affect preference. Conclusions: The typical head shape has changed following the Back to Sleep campaign and the current perception of head shape aligns with the newly described norm as opposed to the historic population data. Criteria for intervention and outcome goals should be adjusted accordingly.

UNLABELLED:Fat grafting is an effective treatment for craniofacial deformities. Stromal vascular fraction (SVF) is a concentrated form of adipose derived stem cells that can be isolated from fat. The aim of this clinical trial was to assess the impact of SVF enrichment on craniofacial fat grafting. METHODS/UNASSIGNED:Twelve subjects with at least two regions of craniofacial volume deficit were enrolled, and they underwent fat grafting with SVF-enriched or standard fat grafting to each area. All patients had bilateral malar regions injected with SVF-enriched graft on one side and control standard fat grafting to the contralateral side. Outcome assessments included demographic information, volume retention determined by CT scans, SVF cell populations assessed by flow cytometry, SVF cell viability, complications, and appearance ratings. Follow-up was 9 months. RESULTS/UNASSIGNED:0.027). CONCLUSIONS/UNASSIGNED:Autologous fat transfer for reconstruction of craniofacial defects is effective and safe, leading to reliable volume retention. However, SVF enrichment does not significantly impact volume retention.

OBJECTIVE:To evaluate the reliability, maximum principal stress, shear stress, and crack initiation of a computer-aided design/computer-aided manufacturing (CAD/CAM) resin composite (RC) incorporating surface pre-reacted glass (S-PRG) filler for primary molar teeth. METHODS:Mandibular primary molar crowns fabricated by experimental (EB) or commercially available CAD/CAM RCs (HC) were prepared and cemented to a resinous abutment tooth using an adhesive resin cement (Cem) or a conventional glass-ionomer cement (CX). These specimens were subjected to a single compressive test (n = 5/each) and the step-stress accelerated life testing (SSALT) (n = 12/each). Data was evaluated using Weibull analyses and reliability was calculated. Afterwards, the maximum principal stress and crack initiation point of each crown was analyzed by finite element analysis. To evaluate bonding of EB and HC to dentin, microtensile bond strength (μTBS) testing was conducted using primary molar teeth (n = 10/each). RESULTS:There was no significant difference between the fracture loads of EB and HC for either cement (p > 0.05). The fracture loads of EB-CX and HC-CX were significantly lower than EB-Cem and HC-Cem (p < 0.05). The reliability at 600 N for EB-Cem was greater than that for EB-CX, HC-Cem, and HC-CX. The maximum principal stress concentrated on EB was lower than that on HC. The shear stress concentrated in the cement layer for EB-CX was higher than that for HC-CX. There was no significant difference among the μTBSs of EB-Cem, EB-CX, HC-Cem, and HC-CX (p > 0.05). SIGNIFICANCE/CONCLUSIONS:The crowns fabricated with the experimental CAD/CAM RC incorporating S-PRG filler yielded greater fracture loads and reliability than the crowns manufactured with commercially available CAD/CAM RC regardless of the luting materials. These findings suggest that the experimental CAD/CAM RC crown may be clinically useful for the restoration of primary molars.

BACKGROUND:Malar augmentation is a key procedure sought out by transfeminine individuals seeking to feminize their facial appearance. Different surgical techniques have been described in the literature including fat transfer to the cheeks and malar implant placement. Because of the paucity of information in the literature, there is no consensus on best practices for this procedure. The objective of our study is to determine the effectiveness and safety of malar implants as compared with fat transfer to the cheeks in transfeminine individuals. METHODS:We examined all patients with the diagnosis of gender dysphoria that were referred to the senior author seeking consultation for feminizing facial procedures between June 2017 and August 2022. Patients who underwent fat transfer to the cheeks or malar implant placement were included in our study. We reviewed the electronic medical record of each patient, and we retrieved and analyzed data regarding demographics, medical and surgical history, operative dictations, clinic notes, and postoperative follow-up. Univariate analysis was used to assess for differences in postoperative complications between these 2 groups. RESULTS:We identified 231 patients underwent feminizing facial gender affirming surgery, with 152 patients receiving malar augmentation through malar implants or fat grafting. One hundred twenty-nine patients (84.9%) underwent malar implant placement and 23 (15.1%) underwent fat grafting to the cheeks. The mean follow-up time was 3.6 ± 2.7 months. Patient satisfaction was greater in the malar implant group (126/129, 97.7%) compared with the fat transfer group (20/23, 87%, P < 0.045). Two patients who received implants (1.8%) experienced postoperative complications. No patient undergoing fat transfer experiences similar adverse outcomes. Nevertheless, the difference was not statistically significant (P = 1.00). CONCLUSIONS:Our findings support the contention that malar implants are a safe alternative for malar augmentation among transfeminine individuals. While autologous fat transfer to the cheek is an indispensable option in patients requiring minor malar enhancement, malar implants offer a more permanent option with a better aesthetic outcome in patients requiring major malar enhancement. To minimize postoperative complications, surgeons should emphasize patient compliance with postoperative directions.

Defects characterized as large osseous voids in bone, in certain circumstances, are difficult to treat, requiring extensive treatments which lead to an increased financial burden, pain, and prolonged hospital stays. Grafts exist to aid in bone tissue regeneration (BTR), among which ceramic-based grafts have become increasingly popular due to their biocompatibility and resorbability. BTR using bioceramic materials such as β-tricalcium phosphate has seen tremendous progress and has been extensively used in the fabrication of biomimetic scaffolds through the three-dimensional printing (3DP) workflow. 3DP has hence revolutionized BTR by offering unparalleled potential for the creation of complex, patient, and anatomic location-specific structures. More importantly, it has enabled the production of biomimetic scaffolds with porous structures that mimic the natural extracellular matrix while allowing for cell growth-a critical factor in determining the overall success of the BTR modality. While the concept of 3DP bioceramic bone tissue scaffolds for human applications is nascent, numerous studies have highlighted its potential in restoring both form and function of critically sized defects in a wide variety of translational models. In this review, we summarize these recent advancements and present a review of the engineering principles and methodologies that are vital for using 3DP technology for craniomaxillofacial reconstructive applications. Moreover, we highlight future advances in the field of dynamic 3D printed constructs via shape-memory effect, and comment on pharmacological manipulation and bioactive molecules required to treat a wider range of boney defects.