Quantifying the Performance of Professional Athletes Following Traumatic Tibial Fractures.

INTRODUCTION: A tibial fracture is an uncommon, yet severe injury that occurs in professional athletes within all major sports leagues. These injuries are often debilitating for professional athletes and can require extensive rehabilitation prior to returning to play. The purpose of this study is to investigate the impact of a tibial fracture on athletic performance in all four major United States sports leagues. METHODS: A publicly available professional sports database, Pro Sports Transactions, was queried for tibial injuries from January 01, 2015, to May 31, 2023. The search included all four major U.S. sports leagues. To quantify and compare athletic ability before and after injury, performance-based statistics were collected from standardized player ratings in periods surrounding the date of injury. The percent change in player performance was measured and stratified. The Pearson correlation test was used to analyze player demographics. RESULTS: There were a total of 24 professional athletes who suffered 28 confirmed tibial fractures across all leagues. Upon return, there was a 14.7% decrease in overall player performance across all leagues. National Basketball Association, National Football League, and National Hockey League athletes had a decrease of 34.5%, 29.1%, and 14.2%, respectively, following their return to play. Major League Baseball players demonstrated an 8.1% increase in player performance following their recovery from tibial fracture. CONCLUSION: Players who suffer tibial fractures often undergo immediate surgery and, in unfortunate cases, may require multiple subsequent procedures. Additionally, athletes spend several months recovering prior to their return. Upon return, athletes' performance may be decreased; however, further study is required to strengthen the association between player performance and tibial fracture recovery.

Current trends in retraction of plastic surgery and reconstruction research.

BACKGROUND: Various studies regarding retractions of publications have determined the rate of retraction has increased in recent years. Although this trend may apply to any field, there is a paucity of literature exploring the publication of erroneous studies within plastic and reconstructive surgery. The present study aims to identify trends in frequency and reasons for retraction of plastic and reconstructive surgery studies, with analysis of subspecialty and journals. METHODS: A database search was conducted for retracted papers within plastic and reconstructive surgery. The initial search yielded 2347 results, which were analyzed by two independent reviewers. 77 studies were jointly identified for data collection. RESULTS: The most common reasons for retractions were duplication (n = 20, 25.9 %), request of author (n = 15, 19.5 %), plagiarism (n = 9, 11.6 %), error (n = 9, 11.6 %), fraud (n = 2, 2.6 %), and conflict of interest (n = 1, 1.3 %). 15 were basic science studies (19.4 %), 58 were clinical science studies (75.3 %), and 4 were not categorized (5.2 %). Subspecialties of retracted papers were maxillofacial (n = 29, 37.7 %), reconstructive (n = 17, 22.0 %), wound healing (n = 8, 10.4 %), burn (n = 6, 7.8 %), esthetics (n = 5, 6.5 %), breast (n = 3, 3.9 %), and trauma (n = 1, 1.3 %). Mean impact factor was 2.9 and average time from publication to retraction was 32 months. CONCLUSION: Analysis of retracted plastic surgery studies revealed a recent rise in frequency of retractions, spanning a wide spectrum of journals and subspecialties.

Prevalence, Characteristics, and Trends in Retracted Spine Literature: 2000-2023.

BACKGROUND: Retraction of scientific publications is an important check on scientific misconduct and serves to maintain the integrity of the scientific literature. The present study aims to examine the prevalence, trends, and characteristics of retracted spine literature across basic science and clinical spine literature. METHODS: Multiple databases were queried for retracted papers relating to spine or spine surgery, between January 2000 and May 2023. Of 112,668 publications initially identified, 125 were ultimately included in the present study following screening by 2 independent reviewers. Journal of origin, reasons for retraction, date of publication, date of retraction, impact factor of journal, countries of research origin, and study design were collected for each included publication. RESULTS: Clinical studies were the most frequent type of retracted publication (n = 70). The most common reason for retraction was fraud (n = 58), followed by plagiarism (n = 22), and peer review process manipulation (n = 16). Impact factors ranged from 0.3 to 11.1 with a median of 3.75. Average months from publication to retraction across all studies was 37.5 months. The higher the journal impact factor, the longer the amount of time between publication and retraction (P = 0.01). China (n = 63) was the country of origin of more than half of all retracted spine publications. CONCLUSIONS: The rate of retractions has been increasing over the past 23 years, and clinical studies have been the most frequently retracted publication type. Clinicians treating disorders of the spine should be aware of these trends when relying on the clinical literature to inform their practice.

Predicting Acute Median Neuropathy in Perilunate Injuries.

Purpose: Perilunate fracture dislocation (PLFD) injuries are associated with the development of acute carpal tunnel syndrome (CTS). The purpose of our study was to identify the factors that increase the likelihood of developing CTS in patients with PLFD. Additionally, we attempted to classify patients who did not initially undergo carpal tunnel release (CTR) at the time of injury but eventually underwent CTR within the follow-up period. Methods: Patients presenting to a level-1 trauma center with isolated PLFDs (Mayfield III-IV) were retrospectively identified by using CPT and ICD-10 codes. Polytraumatized patients, those with a history of previous wrist trauma, or those with previous carpal tunnel symptoms or surgery were excluded. Outcomes of interest included the development of acute CTS, pre- and post-reduction changes in CTS symptoms, and associated hand and wrist fractures. Chi-square tests, Kruskal-Wallis tests, and multivariate logistic regression were used to examine the predictors of developing CTS after a PLFD. Results: In total, 43 patients were included in the final cohort, with a mean age of 44 years, of which 77% were men. The most common fracture of the carpus included scaphoid fractures (9/43, 21%). The average time from presentation to reduction was 636 minutes. Acute CTS symptoms before reduction were present in 26% of the patients and increased post-reduction to 28%. No difference exists between the time to sedation and the presence of acute carpal tunnel symptoms (P >.05). During initial surgical intervention, 79% underwent CTR (27/34). Of the seven patients who did not initially undergo a CTR, 57% (4/7) required a CTR within the follow-up period. Conclusion: Reduction of PLFDs did not significantly improve the number of patients with acute CTS. More than 50% of the patients who did not undergo a CTR at the initial surgery required a CTR within the follow-up period. Type of study/level of evidence: Prognostic III.

Is Morbid Obesity a Modifiable Risk Factor in Patients Who Have Severe Knee Osteoarthritis and do Not Have a Formal Perioperative Optimization Program?

BACKGROUND: Obesity is considered a modifiable risk factor prior to total knee arthroplasty (TKA); however, little data support this hypothesis. Our purpose was to evaluate patients who have a body mass index (BMI) >40 presenting for TKA to determine the incidence of: (1) patients who achieved successful weight loss through nutritional modification or bariatric surgery and (2) patients who underwent TKA over the study period without the presence of a formal optimization program. METHODS: This was a retrospective, single-center analysis. Inclusion criteria included: Kellgren and Lawrence grade 3 or 4 knee osteoarthritis, BMI >40 at presentation, and minimum 1-year follow-up (mean 45 months) (N = 624 patients). Demographics, weight loss interventions, pursuit of TKA, maximum BMI change, and Patient-Reported Outcomes Measurement Information System scores were collected. Multivariable logistic and linear regressions evaluated associations of underlying demographic and treatment characteristics with outcomes. RESULTS: There were 11% of patients who ended up pursuing TKA over the study period. Bariatric surgery was 3.7 times more likely to decrease BMI by minimum 10 compared to nonsurgical intervention (95% confidence interval [CI] [1.7, 8.1]; P = .001). Bariatric surgery resulted in mean BMI change of -3.3 (range, 0 to 22) compared to nonsurgical interventions (-2.6 [range, 0 to 12]) and no intervention (0.4 [range, 0 to 15]; P < .0001). Bariatric surgery patients were 3.1 times more likely to undergo TKA (95% CI [1.3, 7.1]; P = .008), and nonsurgical interventions were 2.4 times more likely to undergo TKA (95% CI [1.3, 4.5]; P = .006) compared to no intervention. Non-White patients across all interventions were less likely to experience loss >5 BMI compared to White patients (95% CI [0.2, 0.9]; P = .018). CONCLUSIONS: Most patients were unable to reduce BMI more than 5 to 10 over a mean 4-year period without a formal weight optimization program. Utilization of bariatric surgery was most successful compared to nonsurgical interventions, although ultimate pursuit of TKA remained low in all cohorts.

The 2023 Orthopaedic Research Society's International Consensus Meeting on musculoskeletal infection: Summary from the host immunity section.

Musculoskeletal infections (MSKI), which are a major problem in orthopedics, occur when the pathogen eludes or overwhelms the host immune system. While effective vaccines and immunotherapies to prevent and treat MSKI should be possible, fundamental knowledge gaps in our understanding of protective, nonprotective, and pathogenic host immunity are prohibitive. We also lack critical knowledge of how host immunity is affected by the microbiome, implants, prior infection, nutrition, antibiotics, and concomitant therapies, autoimmunity, and other comorbidities. To define our current knowledge of these critical topics, a Host Immunity Section of the 2023 Orthopaedic Research Society MSKI International Consensus Meeting (ICM) proposed 78 questions. Systematic reviews were performed on 15 of these questions, upon which recommendations with level of evidence were voted on by the 72 ICM delegates, and another 12 questions were voted on with a recommendation of "Unknown" without systematic reviews. Two questions were transferred to another ICM Section, and the other 45 were tabled for future consideration due to limitations of available human resources. Here we report the results of the voting with internet access to the questions, recommendations, and rationale from the systematic reviews. Eighteen questions received a consensus vote of ≥90%, while nine recommendations failed to achieve this threshold. Commentary on why consensus was not achieved on these questions and potential ways forward are provided to stimulate specific funding mechanisms and research on these critical MSKI host defense questions.

The mobile vaccine equity enhancement program-a model program for enhancing equity in vaccine availability based at a large health care system.

The SARS CoV-2 (COVID-19) pandemic presented unprecedented challenges as communities attempted to respond to the administration of a novel vaccine that faced cold chain logistical requirements and vaccine hesitancy among many, as well as complicated phased rollout plans that changed frequently as availability of the vaccine waxed and waned. The COVID-19 pandemic also disproportionately affected communities of color and communities with barriers to accessing healthcare. In the setting of these difficulties, a program was created specifically to address inequity in vaccine administration with a focus on communities of color and linguistic diversity as well as those who had technological barriers to online sign-up processes common at mass vaccination sites. This effort, the Mobile Vaccine Equity Enhancement Program (MVeeP), delivered over 12,000 vaccines in 24 months through a reproducible set of practices that can inform equity-driven vaccine efforts in future pandemics.

Comparable performance of machine learning algorithms in predicting readmission and complications following total joint arthroplasty with external validation.

BACKGROUND: The purpose of the study was to use Machine Learning (ML) to construct a risk calculator for patients who undergo Total Joint Arthroplasty (TJA) on the basis of New York State Statewide Planning and Research Cooperative System (SPARCS) data and externally validate the calculator on a single TJA center. METHODS: Seven ML algorithms, i.e., logistic regression, adaptive boosting, gradient boosting (Xg Boost), random forest (RF) classifier, support vector machine, and single and a five-layered neural network were trained on the derivation cohort. Models were trained on 68% of data, validated on 15%, tested on 15%, and externally validated on 2% of the data from a single arthroplasty center. RESULTS: Validation of the models showed that the RF classifier performed best in terms of 30-d mortality AUROC (Area Under the Receiver Operating Characteristic) 0.78, 30-d readmission (AUROC 0.61) and 90-d composite complications (AUROC 0.73) amongst the test set. Additionally, Xg Boost was found to be the best predicting model for 90-d readmission and 90-d composite complications (AUC 0.73). External validation demonstrated that models achieved similar AUROCs to the test set although variation occurred in top model performance for 90-d composite complications and readmissions between our test and external validation set. CONCLUSION: This was the first study to investigate the use of ML to create a predictive risk calculator from state-wide data and then externally validate it with data from a single arthroplasty center. Discrimination between best performing ML models and between the test set and the external validation set are comparable. LEVEL OF EVIDENCE: III.

The effect of a workplace wellness program on disability, function and pain in healthcare providers workers with low back pain-outcomes of 3040 academic health center employees.

PURPOSE: (1) Identification of musculoskeletal risk factors for healthcare providers suffering low back pain (LBP) and the creation of risk profiles for those individuals and (2) analyze the impact of a workplace wellness program on healthcare providers who suffer from low back pain. METHODS: A total of 3040 employees at an academic healthcare center underwent a computer-adaptive survey of health-related quality of life (HRQOL), biometric tests, and a disability and functional movement assessment as part of the workplace wellness program (WWP). Clinical interventions with a rehabilitation specialist were offered to employees identified as at risk for low back pain. Data collected were analyzed using descriptive methods and multivariable regressions to address the study objectives. RESULTS: Of the 3040 healthcare providers enrolled in this study, 77% identified with non-specific LBP with greater weakness, numbness, reduced flexibility, and physical activity. The major predictive risk factors for LBP were Patient-Reported Outcomes Measurement Information System (PROMIS) pain interference score, PROMIS fatigue, previous work injury, flexibility, numbness, PROMIS social function, level of education, and BMI. Healthcare providers with LBP who completed the WWP improved in most dimensions of HRQOL and disability and functional outcomes. CONCLUSIONS: A high proportion of healthcare providers suffer from LBP as a result of the nature of their work. Disability and functional outcomes measurements and PROMIS results quantitatively assess healthcare providers with LBP. Organizations can develop injury mitigation programs to target employees at high risk of LBP using the risk factors we identify. Completion of the WWP was associated with improvements in disability, HRQOL and functional measures.

Multimodality Imaging in the Detection of Ischemic Heart Disease in Women.

Women with coronary artery disease tend to have a worse short and long-term prognosis relative to men and the incidence of atherosclerotic cardiovascular disease is increasing. Women are less likely to present with classic anginal symptoms when compared with men and more likely to be misdiagnosed. Several non-invasive imaging modalities are available for diagnosing ischemic heart disease in women and many of these modalities can also assist with prognostication and help to guide management. Selection of the optimal imaging modality to evaluate women with possible ischemic heart disease is a scenario which clinicians often encounter. Earlier modalities such as exercise treadmill testing demonstrate significant performance variation in men and women, while newer modalities such as coronary CT angiography, myocardial perfusion imaging and cardiac magnetic resonance imaging are highly specific and sensitive for the detection of ischemia and coronary artery disease with greater parity between sexes. Individual factors, availability, diagnostic performance, and female-specific considerations such as pregnancy status may influence the decision to select one modality over another. Emerging techniques such as strain rate imaging, CT-myocardial perfusion imaging and cardiac magnetic resonance imaging present additional options for diagnosing ischemia and coronary microvascular dysfunction.

The fourth column of the spine: Prevalence of sternal fractures and concurrent thoracic spinal fractures.

STUDY DESIGN: Retrospective analysis. OBJECTIVE: This study aimed to identify the prevalence of concomitant thoracic spinal and sternal fractures and factors associated with concomitant fractures. SUMMARY OF BACKGROUND DATA: The sternum has been implicated in stability of the upper thoracic spine, and both bony structures are included in the stable upper thoracic cage. High force trauma to the thorax can cause multiple fractures to different upper thoracic cage components. METHODS: This is a retrospective analysis of electronic medical record data of patients treated at a Level 1 Trauma Center who underwent surgery for thoracic spinal fracture between 2008-2020. We recorded presence of concomitant sternal fracture, injury characteristics, hospital course data, and demographic information. RESULTS: 107 patients with thoracic spinal fractures had a sternal fracture prevalence of 18.7%. The average age was 53.2 [15-90]. 72 (67.3%) were male and 35 (32.7%) were female, 92 (85.9%) were White, 10 (9.3%) were African American, 3 (2.8%) were Hispanic, and 2 (1.9%) were Asian. The average age of patients with sternal fractures was 48.7 years, compared to those without sternal fractures, 54.3 years (P = 0.251). Patients with T1-T7 fractures [14 of 48 (29.2%)] had a significantly higher rate of sternal fractures compared to patients with T8-T12 fractures [6 of 59 (10.2%)] (P = 0.012). Patients with additional rib (P < 0.001), scapula (P = 0.01), clavicle fractures (P = 0.01), and those with multiple other thoracic fractures (P = 0.01) had significantly higher rates of sternal fractures compared to patients without these. Patients with concomitant sternal fractures [10 of 20 (50.0%)] had a significantly higher rate of respiratory complication during their hospital course than patients without concomitant sternal fracture [40 of 87 (46.0%)] (P < 0.001). Sex, age, mechanism of injury, fracture morphology, estimated blood loss during surgery, intraoperative complications, post-surgical intubation status, and post-surgical intubation duration were not associated with sternal fractures. CONCLUSIONS: The prevalence of concomitant thoracic spinal fracture and sternal fracture in our series is 18.7%. T1-T7 fractures and presence of rib, scapula, and clavicle fractures were significantly associated with the presence of sternal fractures. Presence of concomitant sternal fracture was significantly associated with respiratory complication during hospital course.

Platelet-rich plasma as a therapy for androgenic alopecia: a systematic review and meta-analysis.

OBJECTIVE: The past decade has seen platelet-rich plasma (PRP) become a popular therapy around the world as a treatment for androgenetic alopecia (AGA). These systematic review and meta-analyses assess the effectiveness and adverse effects of PRP to determine the role of PRP as a treatment for AGA among the other non-surgical treatment modalities. METHODS: This study follows the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines and is registered under the PROSPERO ID CRD42019136329. Seven databases were searched from inception through May 2019. Meta-analyses of randomized controlled trials (RCTs) were performed to evaluate the effect of PRP treatments on hair density and hair thickness. RESULTS: Thirty studies, including 687 patients, met our inclusion criteria. Twenty-nine studies reported beneficial results, and 24 studies reached statistical significance on a measured outcome. Ten RCTs were included. Our meta-analyses show that PRP treatment increases hair density and hair thickness. CONCLUSIONS: PRP is an autologous treatment that lacks serious adverse effects and effectively improves hair density and hair thickness in men and women with AGA. Future research should include low risk-of-bias RCTs to optimize treatment protocols, investigate variability among studies, and to obtain more data on hair thickness changes.

Diagnostic Yield of Axial Computed Tomography Scans for Pediatric Axial Skeletal Injuries.

STUDY DESIGN: Retrospective cohort study. OBJECTIVE: To evaluate the diagnostic yield of computed tomography (CT) imaging of the axial skeleton in pediatric patients evaluated a level I trauma center. SUMMARY OF BACKGROUND DATA: CT imaging has become ubiquitous in the assessment of axial skeletal injuries in trauma patients. METHODS: This is a retrospective study from one Level I trauma center of patients undergoing CT imaging during pediatric trauma assessment. Medical records of pediatric trauma patients 18-year old and younger who underwent axial skeletal CT imaging from 2013 to 2015 were evaluated. The following were assessed: mechanism of injury, age, sex, race/ethnicity, presence of fracture, management of fracture. RESULTS: A total of 831 patients were assessed, there were 355 (42.7%) females and 476 males (57.3%) with an average age of 15.4 (2 mo-18 yrs). 588 (70.8%) were White, 164 (19.7%) were African-American, 12 (1.4%) were Asians, 67 (8.1%) other, and 46 (5.5%) identified as Hispanic. There were 45 patients (5.4%) who sustained 52 fractures. Common mechanisms were motor vehicle accidents (MVA) 28%, sports injuries (18%), and fall from height (15%). 35.9% of fractures were identified on plain radiographs. Nine injuries were treated surgically (one cervical, two thoracic, two lumbar, and four pelvic); three of these were identified on radiographs. From the 14 patients with cervical spine fractures none were detected on radiographs. CONCLUSION: In this large series of 831 pediatric patients undergoing axial CT imaging, the rate of axial fractures was 5.4%. The majority of these fractures were managed non-surgically. Only 35.9% of fractures were identified on radiographs.Level of Evidence: 3.

An Arabidopsis Prolyl 4 Hydroxylase Is Involved in the Low Oxygen Response.

Plant responses to flooding, submergence and waterlogging are important for adaptation to climate change environments. Therefore, the characterization of the molecular mechanisms activated under hypoxic and anoxic conditions might lead to low oxygen resilient crops. Although in mammalian systems prolyl 4 hydroxylases (P4Hs) are involved in the oxygen sensing pathway, their role in plants under low oxygen has not been extensively investigated. In this report, an Arabidopsis AtP4H3 T-DNA knock out mutant line showed higher sensitivity to anoxic treatment possibly due to lower induction of the fermentation pathway genes, ADH and PDC1, and of sucrose synthases, SUS1 and SUS4. This sensitivity to anoxia was accompanied by lower protein levels of AGPs-bound epitopes such as LM14 in the mutant line and induction of extensins-bound epitopes, while the expression levels of the majority of the AGPs genes were stable throughout a low oxygen time course. The lower AGPs content might be related to altered frequency of proline hydroxylation occurrence in the p4h3 line. These results indicate active involvement of proline hydroxylation, a post-translational modification, to low oxygen response in Arabidopsis.

Rejuvenating the periorbital area using platelet-rich plasma: a systematic review and meta-analysis.

Intradermal injection of autologous platelet-rich plasma (PRP) is a non-surgical cosmetic therapy to rejuvenate the periorbital area pathologies of wrinkles, periorbital hyperpigmentation (POH), and photoaging. The past decade has seen the adoption of this novel therapy around the world. This is the first systematic review and meta-analysis evaluating PRP treatment of periorbital pathologies. This is a PRISMA compliant review that includes a comprehensive search of the databases Cochrane Library, Ovid Medline, Ovid Embase, and clinicaltrials.gov. The search was performed in June 2019 to obtain all peer-reviewed articles published in English that describe the application of PRP to periorbital pathologies. A meta-analysis of patient satisfaction was performed for randomized controlled trials. Nineteen studies treating 455 patients (95% female, age range 28-60) were included. Studies were categorized based on reported outcomes: wrinkles (11 studies), POH (7 studies), and photoaging (6 studies). Patients were treated a mean of 3 times (range 1-8) in mean intervals of 23 days (range 14-56 days). Follow-up averaged 3 months (range 1-6 months). Meta-analysis of 3 randomized controlled clinical trials (RCTs) shows that patients treated with PRP have increased satisfaction above controls of saline, platelet-poor plasma, mesotherapy, and as an adjunct to laser therapy (overall effect p = 0.001, heterogeneity I2 = 64%). PRP treatment of periorbital area pathologies results in histologic improvements of photoaging, subjective satisfaction score increases, and blind evaluator assessments of rejuvenated skin appearance. Future studies are needed to address limitations of the current literature and should include long-term follow-up, delineation of the POH etiology that is treated, RCTs with low risk of bias, and be absent conflicts of interest or industry sponsors.Trial registration: Prospero Systematic Review Registration ID: CRD42019135968.

Inhibition of colony stimulating factor 1 receptor corrects maternal inflammation-induced microglial and synaptic dysfunction and behavioral abnormalities.

Maternal immune activation (MIA) disrupts the central innate immune system during a critical neurodevelopmental period. Microglia are primary innate immune cells in the brain although their direct influence on the MIA phenotype is largely unknown. Here we show that MIA alters microglial gene expression with upregulation of cellular protrusion/neuritogenic pathways, concurrently causing repetitive behavior, social deficits, and synaptic dysfunction to layer V intrinsically bursting pyramidal neurons in the prefrontal cortex of mice. MIA increases plastic dendritic spines of the intrinsically bursting neurons and their interaction with hyper-ramified microglia. Treating MIA offspring by colony stimulating factor 1 receptor inhibitors induces depletion and repopulation of microglia, and corrects protein expression of the newly identified MIA-associated neuritogenic molecules in microglia, which coalesces with correction of MIA-associated synaptic, neurophysiological, and behavioral abnormalities. Our study demonstrates that maternal immune insults perturb microglial phenotypes and influence neuronal functions throughout adulthood, and reveals a potent effect of colony stimulating factor 1 receptor inhibitors on the correction of MIA-associated microglial, synaptic, and neurobehavioral dysfunctions.

Split-Block Graft Versus Cortico-cancellous Block Graft for Horizontal Ridge Augmentation: Cone Beam Computed Tomography and Histomorphometric Study / Enxerto de bloco dividido versus enxerto de bloco córtico-esponjoso para aumento horizontal do rebordo: imagens de tomografia computadorizada de feixe cônico e estudo histomorfométrico

Objective: The aim of this study was to compare the horizontal dimensional changes of split-bone block and cortico-cancellous block graft in horizontal ridge augmentation using Cone Beam Computed Tomography (CBCT). The quality of the regenerated bone in both groups was compared histologically and histomorphometrically. Material and methods: Twenty patients were randomly divided in two equal groups (n= 10): Split-bone block group which was harvested from the external oblique ridge or cortico-cancellous block graft group which was harvested from the mandibular symphysis. Pre-augmentation crestal ridge width was measured using bone caliper. CBCT scans were taken on the 2nd week and 4th month post-operatively to measure crestal and total horizontal ridge dimensions. A biopsy was collected from the regenerated ridge immediately before implant insertion on the 4thmonth post-operatively. Results: Pre-augmentation crestal bone widths of both groups were comparable (P= 0.870). On the 2nd week and 4th month post-operatively, split-bone block showed a significantly wider crestal (P= 0.028 and P= 0.001 respectively) and total horizontal ridge dimension (P= 0.025 and P= 0.002 respectively), and on the 4th month post-operatively, it showed significantly lesser resorption at crest (P= 0.040) and in total horizontal ridge dimension (P= 0.017) than cortico-cancellous block. Histologically, the regenerated bone quality was similar in both groups. Histomorphometric analysis showed a non-significant difference in percentage of mature (P= 0.365) and immature collagen (P= 0.531) between both groups. Conclusion: Split-bone block maintained a significantly wider ridge and experienced less resorption after 4 months than the cortico-cancellous block graft, with no difference in regenerated bone quality between both groups. (AU)

Objetivo: O objetivo deste estudo foi comparar as mudanças dimensionais horizontais do enxerto de bloco ósseo dividido e do enxerto de bloco córtico-esponjoso no aumento de rebordo horizontal por meio da Tomografia computadorizada de feixe cônico (TCFC). A qualidade do osso regenerado em ambos os grupos foi comparada histológica e histomorfometricamente. Material e Métodos:Vinte pacientes foram divididos aleatoriamente em dois grupos iguais (n=10): Grupo de blocos de osso dividido retirado da crista oblíqua externa ou Grupo de enxerto em bloco córtico-esponjoso retirado da sínfise mandibular. A largura da crista pré-aumentada foi medida usando calibrador ósseo. Os exames de TCFC foram realizados na segunda semana e quarto mês de pós operatório para medir as dimensões da crista e dimensões horizontais totais do rebordo. Uma biopsia foi coletada da crista regenerada imediatamente antes da inserção do implante no quarto mês pós-operatório. Resultados: As larguras do osso crestal pré-aumentado de ambos os grupos eram compatíveis (p = 0,870). Na segunda semana e quarto mês pós-operatórios, o bloco ósseo dividido mostrou uma crista significativamente mais larga (p = 0,28 e p = 0,001 respectivamente) e a dimensão da crista horizontal total (p = 0,025 e p = 0,002 respectivamente), e no quarto mês pós-operatório, apresentou reabsorção significativamente menor na crista (p = 0,040) e na dimensão da crista horizontal total (p = 0,017) em comparação ao bloco córtico-esponjoso. Histologicamente, a qualidade do osso regenerado foi semelhante em ambos os grupos. A análise histomorfométrica mostrou uma diferença não significativa na porcentagem de colágeno maduro (p = 0.365) e colágeno imaturo (p = 0,531) entre ambos os grupos. Conclusão: O bloco ósseo dividido manteve uma crista significativamente mais larga e apresentou menos reabsorção após 4 meses, em comparação ao enxerto em bloco córtico-esponjoso, sem diferença na qualidade do osso regenerado entre ambos os grupos. (AU)

Nonanastomotic Biliary Strictures After Liver Transplantation.

Biliary strictures constitute a major source of morbidity and mortality following liver transplantation (LT). However, studies on the impact of nonanastomotic biliary strictures (NABS) on grafts after LT are limited. 649 patients who underwent LT between January 2013 and June 2017 at our center were retrospectively analyzed and 2.6% (n = 17) of the recipients developed NABS following LT. There were no differences between recipients with and without NABS in indication of LT, graft ischemia time, and type of biliary anastomosis. The incidence of post-LT hepatic artery thrombosis (HAT) (odds ratio [OR]: 15.75, P < .001) and the use of livers from donation after cardiac death (DCD) donors (OR: 8.292, P = .004) were identified as independent significant predictors of NABS by multivariate analysis. Graft survival in those with NABS was significantly worse than in patients without NABS (1-, 3-, and 5-years survival: 64.7%, 57.5%, 0%, vs. 89.8%, 84.0%, 76.4%, P < .001). In conclusion, while the incidence of NABS in our study was relatively low compared to previous reports, NABS was still found to be associated with poor graft survival. Special attention should be paid to NABS occurrence in grafts that develop HAT as well as those from DCD donors.