How much does the injury risk between average female and average male anthropometry differ? - A simulation study with open source tools for virtual crash safety assessments

Analysis of Concussions with Persisting Symptoms Caused by Motor Vehicle Crashes in 136 Vehicle Occupants Shows that Females Are Vulnerable Road Users

At the Canadian Concussion Centre, we treated 136 patients from 2000 to 2020 who sustained concussion plus persisting concussion symptoms (C+PCS) as motor vehicle occupants involved in motor vehicle crashes (MVCs). This center specializes in the treatment of patients with C+PCS. The objective of the present study was to identify strategies for preventing concussion among vehicle occupants involved in MVC. Indeed, this is the first study focused on C+PCS in MVC occupants, and our main purpose was to evaluate the effectiveness of onboard concussion prevention strategies. In this retrospective, consecutive cohort of 136 patients with C+PCS, we examined the patients' demographic and injury features in relation to the nature of the MVC including speed, direction of impact, and availability, deployment, and effectiveness of onboard occupant safety measures including seatbelts, head restraints, and airbags. The most frequent combination of factors was a belted female driver of an automobile struck from behind by another automobile. Surprisingly, the entire patient cohort comprised more females (69.1%) than males (30.9%), and rear-end collision was the most common type in females. Most injured occupants of both sexes were wearing seatbelts, but only a minority of the crashes caused airbag deployment. The seven most common symptoms were headache (84.6%), anxiety (72.8%), sensitivity to light (70.6%), memory problems (69.9%), sensitivity to noise (66.2%), irritability (56.6%), and depression (55.9%). Whiplash was a frequent associated injury in both sexes. Complete recovery from C+PCS was rare, and most patients with known follow-up continued to suffer from persisting symptoms for months to years. The median symptom duration for all 136 patients was 30.0 months (interquartile range: 16.8-56.0 months). Based on these findings, we conclude that females are indeed vulnerable road users with respect to C+PCS, and our literature search showed that there had been some previous evidence of increased injury risk of other injuries in female occupants. We recommend that additional prevention strategies are required to reduce the post-crash acceleration-deceleration "bobble-head" movement of the head on trunk causing both concussion and whiplash as has been accomplished in auto racing. Also, these prevention measures must be investigated in crash studies that include low-to-high speed rear-end collisions using anthropometrically appropriate models of male and female occupants reflecting the range of sizes of both sexes. There is a need for more concussion brain injury prevention research focusing on the vulnerability of female occupants, which has not been sufficiently addressed even though the deficiency was identified many years ago. The sex inequity of current onboard motor vehicle concussion brain injury prevention measures especially with respect to females should be addressed by governments and the automobile and insurance industries.

An enhanced method for evaluating the effectiveness of protective devices for road safety application

This paper presents an enhanced probabilistic approach to estimate the real-world safety performance of new device concepts for road safety applications from the perspective of Powered Two-Wheeler (PTW) riders who suffer multiple injuries in different body regions. The proposed method estimates the overall effectiveness of safety devices for PTW riders by correlating computer simulations with various levels of actual injuries collected worldwide from accident databases. The study further develops the methodology initially presented by Johnny Korner in 1989 by introducing a new indicator, Global Potential Damage (GPD), that overcomes the limitations of the original method, encompassing six biomechanical injury indices estimated in five body regions. A Weibull regression model was fit to the field data using the Maximum Likelihood Method with boundaries at the 90% confidence level for the construction of novel injury risk curves for PTW riders. The modified methodology was applied for the holistic evaluation of the effectiveness of a new safety system, the Belted Safety Jacket (BSJ), in head-on collisions across multiple injury indices, body regions, vehicle types, and speed pairs without sub-optimizing it at specific crash severities. A virtual multi-body environment was employed to reproduce a selected set of crashes. The BSJ is a device concept comprising a vest with safety belts to restrict the rider's movements relative to the PTW during crashes. The BSJ exhibited 59% effectiveness, with an undoubted benefit to the head, neck, chest, and lower extremities. The results show that the proposed methodology enables an overall assessment of the injuries, thus improving the protection of PTW users. The novel indicator supports a robust evaluation of safety systems, specifically relevant in the context of PTW accidents.

Moving towards deep equity, diversity, inclusivity and accessibility in simulation: a call to explore the promises and perils

Principles and issues of equity, diversity, inclusivity, and accessibility (EDIA) are being explored currently in simulation designs and trainings but with limited depth, often raising more questions than answers. This editorial invites the broader healthcare simulation community to move beyond the superficial to explore more expansively and deeply these issues of EDIA within simulation. Simulation is the very environment and context from which we may confront how existing (power) structures can be dismantled and re-envisioned for more optimal redistribution of participation, power, and benefits. We can use simulation to experiment with variations of these realities, and start exploring consequences of such alternatives to benefit our broader health systems and societies. Simulation uniquely combines opportunities for experience, reflection, application and active experimentation, enabling a ripe ground for this study. In fact, it is the responsibility of simulation educators to take up this challenge, and to engage in meaningful scholarship to understand more about the impact of simulation in exploring EDIA topics. This editorial invites contributions of empirical and theoretical works that advance our collective understanding of EDIA, while also cautioning against complacency. The simulation community is urged to look inwards and also examine its own practices critically, in spite of the uncertainty, vulnerability and risks that this presents.