A radiographic assessment of pediatric fracture healing and time since injury

Past studies and pediatric bone physiology indicate that younger individuals may heal at a faster rate. Additionally, in adults upper limb fractures heal faster than lower limb fractures; this trend is expected for pediatric fractures. This study aims to evaluate and compare rates of fracture repair in children based on age and skeletal element. Six stages are used to describe the bone repair process in 294 radiographs of tibial and radial fractures from 107 infants and young children. Healing rates are examined using ANOVA and Welch's t-test with a 95% confidence interval. Results indicate that younger individuals spend less time at stage 1, suggesting a delay in the start of healing. Furthermore, forearm fractures heal faster than leg fractures at stages 2 and 3, suggesting a role in the osseous reaction of bone healing. The healing schedule presented may allow the timing of injuries to be estimated from radiographs.     

Confocal microscopy analysis of breech face marks on fired cartridge cases from 10 consecutively manufactured pistol slides

Recent publications from the National Academy of Sciences have called for additional foundational research in the field of firearm and toolmark analysis. We examined test fires from 10 pistol slides with consecutively manufactured breech faces. A total of nine test fires from each pistol slide, for a total of 90 test fired cartridge cases, were compared using confocal microscopy combined with three-dimensional cross-correlation analysis algorithms. A total of 8010 comparisons were performed (720 matches and 7290 nonmatches). The average score for matches was 0.82 with a standard deviation of 0.06. The average score for nonmatches was 0.20 with a standard deviation of 0.03. Additionally, subclass toolmarks were observed on the breech faces, but the presence of subclass was not detected in the correlation analysis. There was no overlap of scores between matching and nonmatching test fires. This provides objective data that support the AFTE (Association of Firearms and Tool Mark Examiners) theory of identification.     

Reasonable Grounds Evidence Involving Sexual Violence in Darfur

Internal and international conflicts can often involve a level of impunity that allows sexual violence to persist unchecked by military and political leaders. The recent reversal by an appeals panel at the International Criminal Court of a pretrial decision not to charge President al-Bashir of Sudan with genocide in Darfur offers an important foundation for introducing new types of evidence that can increase the investigation and prosecution of sexual violence during conflicts. The reversal cited the incorrect use of the “beyond a reasonable doubt” standard when the lesser standard of “reasonable grounds” applied. Social science provides methods and measures that can be uniquely used to develop reasonable grounds evidence, for example, to demonstrate the roles of physical perpetrators acting together in horizontal relationships, as well as to establish the indirect participation through vertical relationships of higher-level defendants, in a chain of command of superior responsibility. We illustrate these points by presenting social science evidence of the responsibility of President al-Bashir and middle- and lower-level figures in genocidal violence in Darfur.     

The Effects of Child Abuse and Exposure to Domestic Violence on Adolescent Internalizing and Externalizing Behavior Problems

This study examines the effects of child abuse and domestic violence exposure in childhood on adolescent internalizing and externalizing behaviors. Data for this analysis are from the Lehigh Longitudinal Study, a prospective study of 457 youth addressing outcomes of family violence and resilience in individuals and families. Results show that child abuse, domestic violence, and both in combination (i.e., dual exposure) increase a child’s risk for internalizing and externalizing outcomes in adolescence. When accounting for risk factors associated with additional stressors in the family and surrounding environment, only those children with dual exposure had an elevated risk of the tested outcomes compared to non-exposed youth. However, while there were some observable differences in the prediction of outcomes for children with dual exposure compared to those with single exposure (i.e., abuse only or exposure to domestic violence only), these difference were not statistically significant. Analyses showed that the effects of exposure for boys and girls are statistically comparable.     

Assessing Impact Direction in 3‐point Bending of Human Femora: Incomplete Butterfly Fractures and Fracture Surfaces,,

Current literature associates bending failure with butterfly fracture, in which fracture initiates transversely at the tensile surface of a bent bone and branches as it propagates toward the impact surface. The orientation of the resulting wedge fragment is often considered diagnostic of impact direction. However, experimental studies indicate bending does not always produce complete butterfly fractures or produces wedge fragments variably in tension or compression, precluding their use in interpreting directionality. This study reports results of experimental 3‐point bending tests on thirteen unembalmed human femora. Complete fracture patterns varied following bending failure, but incomplete fractures and fracture surface characteristics were observed in all impacted specimens. A flat, billowy fracture surface was observed in tension, while jagged, angular peaks were observed in compression. Impact direction was accurately reconstructed using incomplete tension wedge butterfly fractures and tension and compression fracture surface criteria in all thirteen specimens.     

Crashing the Party: An Experimental Investigation of Strategic Voting in Primary Elections

The effect of primary formats on voting behavior and candidatefortune has been the topic of recent political, academic andlegal arguments. We address these debates by examining voterbehavior and election outcomes across primary systems in thelaboratory. While we find the rate of strategic voting isgenerally low, the rate varies across primary formats and thepotential impact on election outcomes differs fromconventional perceptions. Results suggest that more openprimary systems generate more strategic voting, but contraryto conventional wisdom, more open systems do not necessarilylead to more moderate election winners.     

The Etiology of the Occurrence of En Banc Review in the U.S. Court of Appeals

The U.S. Courts of Appeals, working principally through three-judge panels, constitute important final arbiters of the meaning of the federal constitution, laws, and regulations and, hence, significant policymakers within the federal system. En banc rehearing—reconsideration of the decision of a three-judge panel by the full complement of judges appointed to the circuit—is an institutional device that ensures circuit decisions are in line with the established preferences of the circuit. The use of en banc varies in frequency across circuits and within circuits over time. Drawing on legal, attitudinal, and strategic perspectives of judicial behavior, we develop and test a set of integrated expectations regarding the causes of this variation. Our analysis finds support for the operation of all three models and suggests that the influence of ideology on the use of en banc in the recent era is not unique but part of a long-standing pattern .     

Strategic institutional choice: Voters, states, and congressional term limits

States’ choices on term limits are quantified as a multiple-categorical variable capturing variation in the type of limits passed. Measures of relative political influence in Congress explain much of this variation. Using 1992 data on the American states, the model controls for unobserved heterogeneity due to voter access to direct democracy in some states. At 2002 values for congressional tenure and federal spending, the model predicts approximately eight to ten additional states would choose to limit their own members’ terms but cannot under a Supreme Court ruling. We discuss implications for institutional federalism and the potential passage of similar political institutions across the states.     

The Role of Interface on the Impact Characteristics and Cranial Fracture Patterns Using the Immature Porcine Head Model

The role of impact interface characteristics on the biomechanics and patterns of cranial fracture has not been investigated in detail, and especially for the pediatric head. In this study, infant porcine skulls aged 2–19 days were dropped with an energy to cause fracturing onto four surfaces varying in stiffness from a rigid plate to one covered with plush carpeting. Results showed that heads dropped onto the rigid surface produced more extensive cranial fracturing than onto carpeted surfaces. Contact forces generated at fracture initiation and the overall maximum contact forces were generally lower for the rigid than carpeted impacts. While the degree of cranial fracturing from impacts onto the heavy carpeted surface was comparable to that of lower‐energy rigid surface impacts, there were fewer diastatic fractures. This suggests that characteristics of the cranial fracture patterns may be used to differentiate energy level from impact interface in pediatric forensic cases.     

Nuclear Terrorism Redux: Conventionalists, Skeptics, and the Margin of Safety

The casual media observer might well believe that nuclear terrorism is highly likely in the United States and it is a question of “when, not if.” This is the view of the “conventionalists.” But there is a second school, the “skeptics,” that believes the nuclear world is more secure than at any time in history and that the possibility of a nuclear terrorist event is overstated. This article articulates arguments made by these two schools of thought and develops a framework for analyzing the issue. It concludes that while enhanced national and international vigilance against nuclear terrorism is necessary, when viewed through an historical lens, today's margin of nuclear safety may actually be higher than in the past.