Mixed Reality in the Operating Room: An Initial Use in Frontal Sinus Setback in Gender-affirming Facial Surgery.

Demand for gender-affirming facial surgery is growing rapidly. Frontal sinus setback, one of the key procedures used in gender-affirming facial surgery, has a particularly high impact on gender perception. Mixed reality (MR) allows a user to view and virtually overlay three-dimensional imaging on the patient and interact with it in real time. We used the Medivis's SurgicalAR system in conjunction with the Microsoft HoloLens Lucille2 (Microsoft). Computed tomography imaging was uploaded to SurgicalAR, and a three-dimensional (3D) hologram was projected onto the display of the HoloLens. The hologram was registered and matched to the patient, allowing the surgeon to view bony anatomy and underlying structures in real time on the patient. The surgeon was able to outline the patient's frontal sinuses using the hologram as guidance. A 3D printed cutting guide was used for comparison. Negligible difference between the mixed reality-based outline and 3D-printed outline was seen. The process of loading the hologram and marking the frontal sinus outline lasted less than 10 minutes. The workflow and usage described here demonstrate significant promise for the use of mixed reality as imaging and surgical guidance technology in gender-affirming facial surgery.

Pediatric Facial Fractures: Demographics, Injury Patterns, and Associated Injuries in 3334 Patients.

Pediatric craniofacial fractures are fundamentally distinct from their adult counterparts because of unique injury patterns and effects on future growth. Understanding patterns and injury context informs management and risk mitigation. Previous studies include only inpatients, operative patients, or are specialty-specific. In contrast, our study presents a comprehensive assessment of all pediatric facial fracture patients seen at a single institution. Patients under 18 years old who were evaluated for facial fractures at a level I pediatric trauma center between 2006 and 2021 were reviewed. Subanalysis was performed for groups defined by age. Variables studied included demographics, etiology, fracture pattern, associated injuries, management, and outcomes. Three thousand thirty-four patients were included. Mean age at presentation was 11.5 to 4.9 years. The majority were Caucasian (82.6%) and male (68.4%). Sports were the leading cause of injury in older patients (42.2% of patients over 12 y), compared with activities of daily living in patients under 6 years (45.5%). Thirty-two percent of patients were hospitalized, 6.0% required ICU care, and 48.4% required surgery. Frequency of ICU admission decreased with age (P<0.001), whereas operative intervention increased with age (P<0.001). Zygomaticomaxillary complex (P=0.002) and nasal fractures (P<0.001) were common in older patients, whereas younger patients experienced more skull (P<0.001) and orbital fractures (P<0.001). The most associated injuries were soft tissue (55.7%) and neurologic (23.6%). This large-scale study provides updated characterization of craniofacial fractures in the pediatric population, providing a necessary framework for future studies on outcomes assessments and preventative care.

Feasibility and Usability of Augmented Reality Technology in the Orthopaedic Operating Room.

PURPOSE OF REVIEW: Augmented reality (AR) has gained popularity in various sectors, including gaming, entertainment, and healthcare. The desire for improved surgical navigation within orthopaedic surgery has led to the evaluation of the feasibility and usability of AR in the operating room (OR). However, the safe and effective use of AR technology in the OR necessitates a proper understanding of its capabilities and limitations. This review aims to describe the fundamental elements of AR, highlight limitations for use within the field of orthopaedic surgery, and discuss potential areas for development. RECENT FINDINGS: To date, studies have demonstrated evidence that AR technology can be used to enhance navigation and performance in orthopaedic procedures. General hardware and software limitations of the technology include the registration process, ergonomics, and battery life. Other limitations are related to the human response factors such as inattentional blindness, which may lead to the inability to see complications within the surgical field. Furthermore, the prolonged use of AR can cause eye strain and headache due to phenomena such as the vergence-convergence conflict. AR technology may prove to be a better alternative to current orthopaedic surgery navigation systems. However, the current limitations should be mitigated to further improve the feasibility and usability of AR in the OR setting. It is important for both non-clinicians and clinicians to work in conjunction to guide the development of future iterations of AR technology and its implementation into the OR workflow.

A Longitudinal Analysis of Pre- and Post-Operative Dysmorphology in Metopic Craniosynostosis.

OBJECTIVE: The purpose of this study is to objectively quantify the degree of overcorrection in our current practice and to evaluate longitudinal morphological changes using CranioRateTM, a novel machine learning skull morphology assessment tool.  . DESIGN: Retrospective cohort study across multiple time points. SETTING: Tertiary care children's hospital. PATIENTS: Patients with preoperative and postoperative CT scans who underwent fronto-orbital advancement (FOA) for metopic craniosynostosis. MAIN OUTCOME MEASURES: We evaluated preoperative, postoperative, and two-year follow-up skull morphology using CranioRateTM to generate a Metopic Severity Score (MSS), a measure of degree of metopic dysmorphology, and Cranial Morphology Deviation (CMD) score, a measure of deviation from normal skull morphology. RESULTS: Fifty-five patients were included, average age at surgery was 1.3 years. Sixteen patients underwent follow-up CT imaging at an average of 3.1 years. Preoperative MSS was 6.3 ± 2.5 (CMD 199.0 ± 39.1), immediate postoperative MSS was -2.0 ± 1.9 (CMD 208.0 ± 27.1), and longitudinal MSS was 1.3 ± 1.1 (CMD 179.8 ± 28.1). MSS approached normal at two-year follow-up (defined as MSS = 0). There was a significant relationship between preoperative MSS and follow-up MSS (R2 = 0.70). CONCLUSIONS: MSS quantifies overcorrection and normalization of head shape, as patients with negative values were less "metopic" than normal postoperatively and approached 0 at 2-year follow-up. CMD worsened postoperatively due to postoperative bony changes associated with surgical displacements following FOA. All patients had similar postoperative metopic dysmorphology, with no significant association with preoperative severity. More severe patients had worse longitudinal dysmorphology, reinforcing that regression to the metopic shape is a postoperative risk which increases with preoperative severity.

True Incidence of Marginal Mandibular Nerve Palsy Following Neonatal Mandibular Distraction Osteogenesis.

INTRODUCTION: In children with PRS, MDO is routinely performed to alleviate airway obstruction; however, it involves risk of injury to the MMN. We hypothesize that MMN palsy incidence following MDO, reported at 1-15%, is underestimated. This study investigates the true incidence of MMN palsy after MDO to better guide follow-up care and improve treatment of this complication. METHODS: A retrospective review of PRS patients who underwent MDO at a single, tertiary pediatric hospital between September 2007 and March 2021 was conducted. Patients who underwent MDO under one year of age and had postoperative clinical evaluations detailing MMN function were included. Logistic regression analysis was performed to investigate predictors of MMN injury. RESULTS: Of 93 patients who underwent MDO, 59.1% met inclusion criteria. 56.4% were female, 43.6% were syndromic, and average age at MDO was 1.52 ± 2.04 months. The average length of mandibular distraction was 17.3 ± 4.36mm, average duration of intubation was 6.57 ± 2.37 days, and average time until hardware removal was 111.1 ± 23.6 days. Sixteen patients (29.1%) presented with permanent MMN dysfunction, comprised of 8 patients with bilateral weakness and 8 with unilateral weakness. An additional five patients (9.1%) presented with transient MMN weakness that resolved within a year. Average length of follow-up postoperatively was 6.02 years, and no significant predictors of nerve injury were found. CONCLUSION: In this 14-year review of patients with PRS who underwent MDO, 38.2% demonstrated evidence of MMN palsy (29.1% permanent, 9.1% transient), which is much greater than previously described.

Understanding Effects of Visual Feedback Delay in AR on Fine Motor Surgical Tasks.

Latency is a pervasive issue in various systems that can significantly impact motor performance and user perception. In medical settings, latency can hinder surgeons' ability to quickly correct movements, resulting in an experience that doesn't align with user expectations and standards of care. Despite numerous studies reporting on the negative effects of latency, there is still a gap in understanding how it impacts the use of augmented reality (AR) in medical settings. This study aims to address this gap by examining how latency impacts motor task performance and subjective perceptions, such as cognitive load, on two display types: a monitor display, traditionally used inside an operating room (OR), and a Microsoft HoloLens 2 display. Our findings indicate that both level of latency and display type impact motor performance, and higher latencies on the HoloLens result in relatively poor performance. However, cognitive load was found to be unrelated to display type or latency, but was dependent on the surgeon's training level. Surgeons did not compromise accuracy to gain more speed and were generally well aware of the latency in the system irrespective of their performance on task. Our study provides valuable insights into acceptable thresholds of latency for AR displays and proposes design implications for the successful implementation and use of AR in surgical settings.

Perceptual Barriers to Becoming a Plastic Surgeon among Underrepresented Medical Students.

Background: The field of plastic surgery has experienced difficulty increasing diversity among trainees, despite significant efforts. Barriers to recruitment of underrepresented in medicine (URM) students are poorly understood. This study assesses URM students' exposure to plastic surgery, access to mentors and research opportunities, and the importance of diversity in the field. Methods: A survey was designed and distributed to members of the Student National Medical Association over 3 months. Survey data were collected using Qualtrics and descriptive statistics, and logistical regressions were performed using SAS. Results: Of the 136 respondents, 75.0% identified as Black (n = 102/136), and 57.4% (n = 66/115) reported a plastic surgery program at their home institution. Of the total respondents, 97.7% (n = 127/130) were concerned about racial representation in plastic surgery, and 44.9% (n = 53/114) would be more likely to apply if there were better URM representation. Most respondents disagreed that there was local (73.4%, n = 58/79) or national (79.2%, n = 57/72) interest in URM recruitment. Students whose plastic surgery programs had outreach initiatives were more likely to have attending (OR 11.7, P < 0.05) or resident mentors (OR 3.0 P < 0.05) and access to research opportunities (OR 4.3, P < 0.05). Conclusions: URM students feel there is an evident lack of interest in recruiting URM applicants in plastic surgery. Programs with outreach initiatives are more likely to provide URM students access to mentorship and research opportunities, allowing students to make informed decisions about pursuing plastic surgery.

Social determinants of health and patient-level mortality prediction after trauma.

BACKGROUND: Social determinants of health (SDOH) impact patient outcomes in trauma. Census data are often used to account for SDOH; however, there is no consensus on which variables are most important. Social vulnerability indices offer the advantage of combining multiple constructs into a single variable. Our objective was to determine if incorporation of SDOH in patient-level risk-adjusted outcome modeling improved predictive performance. METHODS: We evaluated two social vulnerability indices at the zip code level: Distressed Community Index (DCI) and National Risk Index (NRI). Individual variable combinations from Agency for Healthcare Research and Quality's SDOH data set were used for comparison. Patients were obtained from the Pennsylvania Trauma Outcomes Study 2000 to 2020. These measures were added to a validated base mortality prediction model with comparison of area under the curve and Bayesian information criterion. We performed center benchmarking using risk-standardized mortality ratios to evaluate change in rank and outlier status based on SDOH. Geospatial analysis identified geographic variation and autocorrelation. RESULTS: There were 449,541 patients included. The DCI and NRI were associated with an increase in mortality (adjusted odds ratio, 1.02; 95% confidence interval, 1.01-1.03 per 10% percentile rank increase; p < 0.01, respectively). The DCI, NRI, and seven Agency for Healthcare Research and Quality variables also improved base model fit but discrimination was similar. Two thirds of centers changed mortality ranking when accounting for SDOH compared with the base model alone. Outlier status changed in 7% of centers, most representing an improvement from worse-than-expected to nonoutlier or nonoutlier to better-than-expected. There was significant geographic variation and autocorrelation of the DCI and NRI (DCI; Moran's I 0.62, p = 0.01; NRI; Moran's I 0.34, p = 0.01). CONCLUSION: Social determinants of health are associated with an individual patient's risk of mortality after injury. Accounting for SDOH may be important in risk adjustment for trauma center benchmarking. LEVEL OF EVIDENCE: Prognostic/Epidemiologic, level IV.