Lloyd, John
Biomechanics of motorcycle helmet protection Journal Article
In: Journal of Neurotrauma, vol. 33, no. 13, pp. A–84–A–84, 2016, ISBN: 08977151.
Abstract | BibTeX | Tags: accident, Accident victims -- Abstracts, Biomechanics -- Abstracts, Helmet, motorcycle, TBI, Traffic accidents -- Abstracts
@article{Lloyd2016,
title = {Biomechanics of motorcycle helmet protection},
author = {Lloyd, John},
isbn = {08977151},
year = {2016},
date = {2016-01-01},
journal = {Journal of Neurotrauma},
volume = {33},
number = {13},
pages = {A--84--A--84},
abstract = {Motorcycle accident victims account for more than 340,000 fatalities annually, with the Unites States ranking 8th highest worldwide in number of motorcycle accident deaths. Seventy-five percent of all fatal motorcycle accidents involve head and brain injury, with rotational forces acting on the brain the primary cause of mortality. Current motorcycle helmets are reasonably effective at reducing head injuries associated with blunt impact. However, the mechanism of traumatic brain injury is biomechanically very different from that associated with head injury. This biomechanics study was conducted to evaluate the effectiveness of current motorcycle helmets at reducing the risk of traumatic brain injuries, including hemorrhages and concussion. A variety of motorcycle helmet designs, including full-face, threequarter, half-helmets and novelty (non DOT) helmets were evaluated at impact speeds up to 25 mph using a validated test apparatus outfitted with a crash test dummy head and neck. Sensors installed at the center of gravity of the headform and on the helmet enabled high-speed data acquisition of linear and angular head kinematics associated with impact. Variables depicting the impact characteristics and protective properties of the helmet were computed using Matlab- and plot against established biomechanical thresholds for skull fracture, concussion and subdural hematoma. Results of this study indicate that larger, heavier helmets, such as full-face motorcycle helmets, seem to yield a higher risk of traumatic brain injuries, likely due to increased rotational inertia acting on the brain. Findings are also categorized according to the certification standard to which the respective helmets were designed, with interesting discoveries. Most alarming was the limited effectives of current motorcycle helmets in preventing concussion and severe traumatic brain injuries at even modest impact speeds. Considering that motorcyclists purchase protective headgear with the intent of protecting both the head and brain against acute injury it is anticipated that findings from this study will enable endusers to make better-informed purchase decisions. Moreover, it is hoped that knowledge learned from this study will enable the development of a new generation of advanced motorcycle helmets that offer improved protection against both head and brain injuries. [ABSTRACT FROM AUTHOR]},
keywords = {accident, Accident victims -- Abstracts, Biomechanics -- Abstracts, Helmet, motorcycle, TBI, Traffic accidents -- Abstracts},
pubstate = {published},
tppubtype = {article}
}
Oeur, R A; Karton, C; Post, A; Rousseau, P; Hoshizaki, T B; Marshall, S; Brien, S E; Smith, A; Cusimano, M D; Gilchrist, M D
In: Journal of Neurosurgery, vol. 123, no. 2, pp. 415–422, 2015.
Abstract | Links | BibTeX | Tags: accident, Accident reconstruction, accidental injury, Accidents, Adolescent, adult, Article, Biomechanical Phenomena, Biomechanics, brain, brain concussion, brain stem, brain tissue, Cerebellum, clinical article, comparative study, Concussion, controlled study, Female, finite element analysis, Finite element modelling, gray matter, Hematoma, human, Humans, Hybrid iii headform, injury severity, laboratory test, Male, Mechanical, mechanical stress, middle aged, pathology, Pathophysiology, Persistent postconcussive symptoms, PHYSIOLOGY, Post Hoc Analysis, Post-Concussion Syndrome, postconcussion syndrome, priority journal, shear stress, simulation, SPORTS medicine, STATISTICAL significance, Stress, stress strain relationship, Subdural, subdural hematoma, traumatic brain injury, white matter, Young Adult
@article{Oeur2015,
title = {A comparison of head dynamic response and brain tissue stress and strain using accident reconstructions for concussion, concussion with persistent postconcussive symptoms, and subdural hematoma},
author = {Oeur, R A and Karton, C and Post, A and Rousseau, P and Hoshizaki, T B and Marshall, S and Brien, S E and Smith, A and Cusimano, M D and Gilchrist, M D},
doi = {10.3171/2014.10.JNS14440},
year = {2015},
date = {2015-01-01},
journal = {Journal of Neurosurgery},
volume = {123},
number = {2},
pages = {415--422},
abstract = {Object Concussions typically resolve within several days, but in a few cases the symptoms last for a month or longer and are termed persistent postconcussive symptoms (PPCS). These persisting symptoms may also be associated with more serious brain trauma similar to subdural hematoma (SDH). The objective of this study was to investigate the head dynamic and brain tissue responses of injury reconstructions resulting in concussion, PPCS, and SDH. Methods Reconstruction cases were obtained from sports medicine clinics and hospitals. All subjects received a direct blow to the head resulting in symptoms. Those symptoms that resolved in 9 days or fewer were defined as concussions (n = 3). Those with symptoms lasting longer than 18 months were defined as PPCS (n = 3), and 3 patients presented with SDHs (n = 3). A Hybrid III headform was used in reconstruction to obtain linear and rotational accelerations of the head. These dynamic response data were then input into the University College Dublin Brain Trauma Model to calculate maximum principal strain and von Mises stress. A Kruskal-Wallis test followed by Tukey post hoc tests were used to compare head dynamic and brain tissue responses between injury groups. Statistical significance was set at p \< 0.05. Results A significant difference was identified for peak resultant linear and rotational acceleration between injury groups. Post hoc analyses revealed the SDH group had higher linear and rotational acceleration responses (316 g and 23,181 rad/sec2, respectively) than the concussion group (149 g and 8111 rad/sec2, respectively; p \< 0.05). No significant differences were found between groups for either brain tissue measures of maximum principal strain or von Mises stress. Conclusions The reconstruction of accidents resulting in a concussion with transient symptoms (low severity) and SDHs revealed a positive relationship between an increase in head dynamic response and the risk for more serious brain injury. This type of relationship was not found for brain tissue stress and strain results derived by finite element analysis. Future research should be undertaken using a larger sample size to confirm these initial findings. Understanding the relationship between the head dynamic and brain tissue response and the nature of the injury provides important information for developing strategies for injury prevention. © AANS, 2015.},
keywords = {accident, Accident reconstruction, accidental injury, Accidents, Adolescent, adult, Article, Biomechanical Phenomena, Biomechanics, brain, brain concussion, brain stem, brain tissue, Cerebellum, clinical article, comparative study, Concussion, controlled study, Female, finite element analysis, Finite element modelling, gray matter, Hematoma, human, Humans, Hybrid iii headform, injury severity, laboratory test, Male, Mechanical, mechanical stress, middle aged, pathology, Pathophysiology, Persistent postconcussive symptoms, PHYSIOLOGY, Post Hoc Analysis, Post-Concussion Syndrome, postconcussion syndrome, priority journal, shear stress, simulation, SPORTS medicine, STATISTICAL significance, Stress, stress strain relationship, Subdural, subdural hematoma, traumatic brain injury, white matter, Young Adult},
pubstate = {published},
tppubtype = {article}
}
Timpka, T; Jacobsson, J; Ekberg, J; Finch, C F; Bichenbach, J; Edouard, P; Bargoria, V; Branco, P; Alonso, J M
In: Journal of Science & Medicine in Sport, vol. 18, no. 6, pp. 643–650, 2015.
Abstract | Links | BibTeX | Tags: accident, athletic performance, clinical examination, competition, Concussion, Consensus, Epidemiologic Methods, epidemiological data, EPIDEMIOLOGY, football, head injury, health service, human, Humans, information processing, Injuries, Medline, meta analysis, METHODOLOGY, musculoskeletal disease, neck injury, nomenclature, Overuse injuries, physical education, procedures, Qualitative methods, Research Design, Review, self report, sport injury, Sports epidemiology, sports injury, SPORTS medicine, Systematic Review, tennis, Terminology, Terminology as Topic, track and field, training
@article{Timpka2015,
title = {Meta-narrative analysis of sports injury reporting practices based on the Injury Definitions Concept Framework (IDCF): A review of consensus statements and epidemiological studies in athletics (track and field)},
author = {Timpka, T and Jacobsson, J and Ekberg, J and Finch, C F and Bichenbach, J and Edouard, P and Bargoria, V and Branco, P and Alonso, J M},
doi = {10.1016/j.jsams.2014.11.393},
year = {2015},
date = {2015-01-01},
journal = {Journal of Science \& Medicine in Sport},
volume = {18},
number = {6},
pages = {643--650},
abstract = {Objectives: Consistency in routines for reporting injury has been a focus of development efforts in sports epidemiology for a long time. To gain an improved understanding of current reporting practices, we applied the Injury Definitions Concept Framework (IDCF) in a review of injury reporting in a subset of the field. Design: Meta-narrative review. Methods: An analysis of injury definitions reported in consensus statements for different sports and studies of injury epidemiology in athletics (track and field) published in PubMed between 1980 and 2013 was performed. Separate narratives for each of the three reporting contexts in the IDCF were constructed from the data. Results: Six consensus statements and 14 studies reporting on athletics injury epidemiology fulfilled the selection criteria. The narratives on sports performance, clinical examination, and athlete self-report contexts were evenly represented in the eligible studies. The sports performance and athlete self-report narratives covered both professional and community athletes as well as training and competition settings. In the clinical examination narrative, data collection by health service professionals was linked to studies of professional athletes at international championships. Conclusions: From an application of the IDCF in a review of injury reporting in sports epidemiology we observed a parallel usage of reporting contexts in this field of research. The co-existence of reporting methodologies does not necessarily reflect a problematic situation, but only provided that firm precautions are taken when comparing studies performed in the different contexts. © 2014 Sports Medicine Australia.},
keywords = {accident, athletic performance, clinical examination, competition, Concussion, Consensus, Epidemiologic Methods, epidemiological data, EPIDEMIOLOGY, football, head injury, health service, human, Humans, information processing, Injuries, Medline, meta analysis, METHODOLOGY, musculoskeletal disease, neck injury, nomenclature, Overuse injuries, physical education, procedures, Qualitative methods, Research Design, Review, self report, sport injury, Sports epidemiology, sports injury, SPORTS medicine, Systematic Review, tennis, Terminology, Terminology as Topic, track and field, training},
pubstate = {published},
tppubtype = {article}
}
Levin, B; Bhardwaj, A
Chronic traumatic encephalopathy: A critical appraisal Journal Article
In: Neurocritical Care, vol. 20, no. 2, pp. 334–344, 2014.
Abstract | Links | BibTeX | Tags: accident, alcohol consumption, amnesia, amyloid plaque, animal, Animals, Athletic Injuries, autopsy, behavior change, Brain Injury, Chronic, Chronic traumatic encephalopathy, Chronic Traumatic Encephalopathy Dementia, complication, Diffusion Tensor Imaging, disease course, Encephalopathy, functional magnetic resonance imaging, histopathology, human, Humans, longitudinal study, Male, Neurodegenerative, Neurodegenerative Diseases, nonhuman, NUCLEAR magnetic resonance spectroscopy, Parkinsonism, pathogenesis, pathology, Pathophysiology, Prevalence, priority journal, Pugilistic, Review, risk factor, Risk Factors, sport injury, suicide, Systematic Review, traumatic brain injury, violence
@article{Levin2014,
title = {Chronic traumatic encephalopathy: A critical appraisal},
author = {Levin, B and Bhardwaj, A},
url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84896549537\&partnerID=40\&md5=138104db42f7ca99527a78bb9c821f59},
doi = {10.1007/s12028-013-9931-1},
year = {2014},
date = {2014-01-01},
journal = {Neurocritical Care},
volume = {20},
number = {2},
pages = {334--344},
abstract = {Chronic traumatic encephalopathy (CTE) formerly known as dementia pugilistica is a long-term neurodegenerative disorder associated with repeated subconcussive head injuries in high-contact sports. We reviewed the existing literature on CTE and examined epidemiological trends, risk factors, and its temporal progression, and proposed the underlying pathophysiological mechanisms that may provide unique insights to clinicians with an in-depth understanding of the disease to aid in the diagnosis and prevention, and provide future perspectives for research via search of Medline and Cochrane databases as well as manual review of bibliographies from selected articles and monographs. The prevalence of CTE in recent years is on the rise and almost exclusively affects men, with pathologic signs characterized by progressive memory loss, behavioral changes, and violent tendencies with some patients demonstrating Parkinsonian-like symptoms and signs. Many patients with CTE die following suicide, accident, or complications of drug or alcohol use. Postmortem pathologic analysis is characterized by neurofibrillary tangles and A$beta$ plaques in 50 % of cases. Currently, there are no ante-mortem diagnostic criteria, but modern imaging techniques such as functional magnetic resonance (MR) imaging, MR spectroscopy, and diffusion tension imaging hold promise for delineating the future diagnostic criteria. Further long-term longitudinal studies are warranted to investigate risk factors that will enhance understanding of the disease progression and its pathogenesis. © 2013 Springer Science+Business Media.},
keywords = {accident, alcohol consumption, amnesia, amyloid plaque, animal, Animals, Athletic Injuries, autopsy, behavior change, Brain Injury, Chronic, Chronic traumatic encephalopathy, Chronic Traumatic Encephalopathy Dementia, complication, Diffusion Tensor Imaging, disease course, Encephalopathy, functional magnetic resonance imaging, histopathology, human, Humans, longitudinal study, Male, Neurodegenerative, Neurodegenerative Diseases, nonhuman, NUCLEAR magnetic resonance spectroscopy, Parkinsonism, pathogenesis, pathology, Pathophysiology, Prevalence, priority journal, Pugilistic, Review, risk factor, Risk Factors, sport injury, suicide, Systematic Review, traumatic brain injury, violence},
pubstate = {published},
tppubtype = {article}
}
Lloyd, John
Biomechanics of motorcycle helmet protection Journal Article
In: Journal of Neurotrauma, vol. 33, no. 13, pp. A–84–A–84, 2016, ISBN: 08977151.
@article{Lloyd2016,
title = {Biomechanics of motorcycle helmet protection},
author = {Lloyd, John},
isbn = {08977151},
year = {2016},
date = {2016-01-01},
journal = {Journal of Neurotrauma},
volume = {33},
number = {13},
pages = {A--84--A--84},
abstract = {Motorcycle accident victims account for more than 340,000 fatalities annually, with the Unites States ranking 8th highest worldwide in number of motorcycle accident deaths. Seventy-five percent of all fatal motorcycle accidents involve head and brain injury, with rotational forces acting on the brain the primary cause of mortality. Current motorcycle helmets are reasonably effective at reducing head injuries associated with blunt impact. However, the mechanism of traumatic brain injury is biomechanically very different from that associated with head injury. This biomechanics study was conducted to evaluate the effectiveness of current motorcycle helmets at reducing the risk of traumatic brain injuries, including hemorrhages and concussion. A variety of motorcycle helmet designs, including full-face, threequarter, half-helmets and novelty (non DOT) helmets were evaluated at impact speeds up to 25 mph using a validated test apparatus outfitted with a crash test dummy head and neck. Sensors installed at the center of gravity of the headform and on the helmet enabled high-speed data acquisition of linear and angular head kinematics associated with impact. Variables depicting the impact characteristics and protective properties of the helmet were computed using Matlab- and plot against established biomechanical thresholds for skull fracture, concussion and subdural hematoma. Results of this study indicate that larger, heavier helmets, such as full-face motorcycle helmets, seem to yield a higher risk of traumatic brain injuries, likely due to increased rotational inertia acting on the brain. Findings are also categorized according to the certification standard to which the respective helmets were designed, with interesting discoveries. Most alarming was the limited effectives of current motorcycle helmets in preventing concussion and severe traumatic brain injuries at even modest impact speeds. Considering that motorcyclists purchase protective headgear with the intent of protecting both the head and brain against acute injury it is anticipated that findings from this study will enable endusers to make better-informed purchase decisions. Moreover, it is hoped that knowledge learned from this study will enable the development of a new generation of advanced motorcycle helmets that offer improved protection against both head and brain injuries. [ABSTRACT FROM AUTHOR]},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Oeur, R A; Karton, C; Post, A; Rousseau, P; Hoshizaki, T B; Marshall, S; Brien, S E; Smith, A; Cusimano, M D; Gilchrist, M D
In: Journal of Neurosurgery, vol. 123, no. 2, pp. 415–422, 2015.
@article{Oeur2015,
title = {A comparison of head dynamic response and brain tissue stress and strain using accident reconstructions for concussion, concussion with persistent postconcussive symptoms, and subdural hematoma},
author = {Oeur, R A and Karton, C and Post, A and Rousseau, P and Hoshizaki, T B and Marshall, S and Brien, S E and Smith, A and Cusimano, M D and Gilchrist, M D},
doi = {10.3171/2014.10.JNS14440},
year = {2015},
date = {2015-01-01},
journal = {Journal of Neurosurgery},
volume = {123},
number = {2},
pages = {415--422},
abstract = {Object Concussions typically resolve within several days, but in a few cases the symptoms last for a month or longer and are termed persistent postconcussive symptoms (PPCS). These persisting symptoms may also be associated with more serious brain trauma similar to subdural hematoma (SDH). The objective of this study was to investigate the head dynamic and brain tissue responses of injury reconstructions resulting in concussion, PPCS, and SDH. Methods Reconstruction cases were obtained from sports medicine clinics and hospitals. All subjects received a direct blow to the head resulting in symptoms. Those symptoms that resolved in 9 days or fewer were defined as concussions (n = 3). Those with symptoms lasting longer than 18 months were defined as PPCS (n = 3), and 3 patients presented with SDHs (n = 3). A Hybrid III headform was used in reconstruction to obtain linear and rotational accelerations of the head. These dynamic response data were then input into the University College Dublin Brain Trauma Model to calculate maximum principal strain and von Mises stress. A Kruskal-Wallis test followed by Tukey post hoc tests were used to compare head dynamic and brain tissue responses between injury groups. Statistical significance was set at p \< 0.05. Results A significant difference was identified for peak resultant linear and rotational acceleration between injury groups. Post hoc analyses revealed the SDH group had higher linear and rotational acceleration responses (316 g and 23,181 rad/sec2, respectively) than the concussion group (149 g and 8111 rad/sec2, respectively; p \< 0.05). No significant differences were found between groups for either brain tissue measures of maximum principal strain or von Mises stress. Conclusions The reconstruction of accidents resulting in a concussion with transient symptoms (low severity) and SDHs revealed a positive relationship between an increase in head dynamic response and the risk for more serious brain injury. This type of relationship was not found for brain tissue stress and strain results derived by finite element analysis. Future research should be undertaken using a larger sample size to confirm these initial findings. Understanding the relationship between the head dynamic and brain tissue response and the nature of the injury provides important information for developing strategies for injury prevention. © AANS, 2015.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Timpka, T; Jacobsson, J; Ekberg, J; Finch, C F; Bichenbach, J; Edouard, P; Bargoria, V; Branco, P; Alonso, J M
In: Journal of Science & Medicine in Sport, vol. 18, no. 6, pp. 643–650, 2015.
@article{Timpka2015,
title = {Meta-narrative analysis of sports injury reporting practices based on the Injury Definitions Concept Framework (IDCF): A review of consensus statements and epidemiological studies in athletics (track and field)},
author = {Timpka, T and Jacobsson, J and Ekberg, J and Finch, C F and Bichenbach, J and Edouard, P and Bargoria, V and Branco, P and Alonso, J M},
doi = {10.1016/j.jsams.2014.11.393},
year = {2015},
date = {2015-01-01},
journal = {Journal of Science \& Medicine in Sport},
volume = {18},
number = {6},
pages = {643--650},
abstract = {Objectives: Consistency in routines for reporting injury has been a focus of development efforts in sports epidemiology for a long time. To gain an improved understanding of current reporting practices, we applied the Injury Definitions Concept Framework (IDCF) in a review of injury reporting in a subset of the field. Design: Meta-narrative review. Methods: An analysis of injury definitions reported in consensus statements for different sports and studies of injury epidemiology in athletics (track and field) published in PubMed between 1980 and 2013 was performed. Separate narratives for each of the three reporting contexts in the IDCF were constructed from the data. Results: Six consensus statements and 14 studies reporting on athletics injury epidemiology fulfilled the selection criteria. The narratives on sports performance, clinical examination, and athlete self-report contexts were evenly represented in the eligible studies. The sports performance and athlete self-report narratives covered both professional and community athletes as well as training and competition settings. In the clinical examination narrative, data collection by health service professionals was linked to studies of professional athletes at international championships. Conclusions: From an application of the IDCF in a review of injury reporting in sports epidemiology we observed a parallel usage of reporting contexts in this field of research. The co-existence of reporting methodologies does not necessarily reflect a problematic situation, but only provided that firm precautions are taken when comparing studies performed in the different contexts. © 2014 Sports Medicine Australia.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Levin, B; Bhardwaj, A
Chronic traumatic encephalopathy: A critical appraisal Journal Article
In: Neurocritical Care, vol. 20, no. 2, pp. 334–344, 2014.
@article{Levin2014,
title = {Chronic traumatic encephalopathy: A critical appraisal},
author = {Levin, B and Bhardwaj, A},
url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84896549537\&partnerID=40\&md5=138104db42f7ca99527a78bb9c821f59},
doi = {10.1007/s12028-013-9931-1},
year = {2014},
date = {2014-01-01},
journal = {Neurocritical Care},
volume = {20},
number = {2},
pages = {334--344},
abstract = {Chronic traumatic encephalopathy (CTE) formerly known as dementia pugilistica is a long-term neurodegenerative disorder associated with repeated subconcussive head injuries in high-contact sports. We reviewed the existing literature on CTE and examined epidemiological trends, risk factors, and its temporal progression, and proposed the underlying pathophysiological mechanisms that may provide unique insights to clinicians with an in-depth understanding of the disease to aid in the diagnosis and prevention, and provide future perspectives for research via search of Medline and Cochrane databases as well as manual review of bibliographies from selected articles and monographs. The prevalence of CTE in recent years is on the rise and almost exclusively affects men, with pathologic signs characterized by progressive memory loss, behavioral changes, and violent tendencies with some patients demonstrating Parkinsonian-like symptoms and signs. Many patients with CTE die following suicide, accident, or complications of drug or alcohol use. Postmortem pathologic analysis is characterized by neurofibrillary tangles and A$beta$ plaques in 50 % of cases. Currently, there are no ante-mortem diagnostic criteria, but modern imaging techniques such as functional magnetic resonance (MR) imaging, MR spectroscopy, and diffusion tension imaging hold promise for delineating the future diagnostic criteria. Further long-term longitudinal studies are warranted to investigate risk factors that will enhance understanding of the disease progression and its pathogenesis. © 2013 Springer Science+Business Media.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Lloyd, John
Biomechanics of motorcycle helmet protection Journal Article
In: Journal of Neurotrauma, vol. 33, no. 13, pp. A–84–A–84, 2016, ISBN: 08977151.
Abstract | BibTeX | Tags: accident, Accident victims -- Abstracts, Biomechanics -- Abstracts, Helmet, motorcycle, TBI, Traffic accidents -- Abstracts
@article{Lloyd2016,
title = {Biomechanics of motorcycle helmet protection},
author = {Lloyd, John},
isbn = {08977151},
year = {2016},
date = {2016-01-01},
journal = {Journal of Neurotrauma},
volume = {33},
number = {13},
pages = {A--84--A--84},
abstract = {Motorcycle accident victims account for more than 340,000 fatalities annually, with the Unites States ranking 8th highest worldwide in number of motorcycle accident deaths. Seventy-five percent of all fatal motorcycle accidents involve head and brain injury, with rotational forces acting on the brain the primary cause of mortality. Current motorcycle helmets are reasonably effective at reducing head injuries associated with blunt impact. However, the mechanism of traumatic brain injury is biomechanically very different from that associated with head injury. This biomechanics study was conducted to evaluate the effectiveness of current motorcycle helmets at reducing the risk of traumatic brain injuries, including hemorrhages and concussion. A variety of motorcycle helmet designs, including full-face, threequarter, half-helmets and novelty (non DOT) helmets were evaluated at impact speeds up to 25 mph using a validated test apparatus outfitted with a crash test dummy head and neck. Sensors installed at the center of gravity of the headform and on the helmet enabled high-speed data acquisition of linear and angular head kinematics associated with impact. Variables depicting the impact characteristics and protective properties of the helmet were computed using Matlab- and plot against established biomechanical thresholds for skull fracture, concussion and subdural hematoma. Results of this study indicate that larger, heavier helmets, such as full-face motorcycle helmets, seem to yield a higher risk of traumatic brain injuries, likely due to increased rotational inertia acting on the brain. Findings are also categorized according to the certification standard to which the respective helmets were designed, with interesting discoveries. Most alarming was the limited effectives of current motorcycle helmets in preventing concussion and severe traumatic brain injuries at even modest impact speeds. Considering that motorcyclists purchase protective headgear with the intent of protecting both the head and brain against acute injury it is anticipated that findings from this study will enable endusers to make better-informed purchase decisions. Moreover, it is hoped that knowledge learned from this study will enable the development of a new generation of advanced motorcycle helmets that offer improved protection against both head and brain injuries. [ABSTRACT FROM AUTHOR]},
keywords = {accident, Accident victims -- Abstracts, Biomechanics -- Abstracts, Helmet, motorcycle, TBI, Traffic accidents -- Abstracts},
pubstate = {published},
tppubtype = {article}
}
Oeur, R A; Karton, C; Post, A; Rousseau, P; Hoshizaki, T B; Marshall, S; Brien, S E; Smith, A; Cusimano, M D; Gilchrist, M D
In: Journal of Neurosurgery, vol. 123, no. 2, pp. 415–422, 2015.
Abstract | Links | BibTeX | Tags: accident, Accident reconstruction, accidental injury, Accidents, Adolescent, adult, Article, Biomechanical Phenomena, Biomechanics, brain, brain concussion, brain stem, brain tissue, Cerebellum, clinical article, comparative study, Concussion, controlled study, Female, finite element analysis, Finite element modelling, gray matter, Hematoma, human, Humans, Hybrid iii headform, injury severity, laboratory test, Male, Mechanical, mechanical stress, middle aged, pathology, Pathophysiology, Persistent postconcussive symptoms, PHYSIOLOGY, Post Hoc Analysis, Post-Concussion Syndrome, postconcussion syndrome, priority journal, shear stress, simulation, SPORTS medicine, STATISTICAL significance, Stress, stress strain relationship, Subdural, subdural hematoma, traumatic brain injury, white matter, Young Adult
@article{Oeur2015,
title = {A comparison of head dynamic response and brain tissue stress and strain using accident reconstructions for concussion, concussion with persistent postconcussive symptoms, and subdural hematoma},
author = {Oeur, R A and Karton, C and Post, A and Rousseau, P and Hoshizaki, T B and Marshall, S and Brien, S E and Smith, A and Cusimano, M D and Gilchrist, M D},
doi = {10.3171/2014.10.JNS14440},
year = {2015},
date = {2015-01-01},
journal = {Journal of Neurosurgery},
volume = {123},
number = {2},
pages = {415--422},
abstract = {Object Concussions typically resolve within several days, but in a few cases the symptoms last for a month or longer and are termed persistent postconcussive symptoms (PPCS). These persisting symptoms may also be associated with more serious brain trauma similar to subdural hematoma (SDH). The objective of this study was to investigate the head dynamic and brain tissue responses of injury reconstructions resulting in concussion, PPCS, and SDH. Methods Reconstruction cases were obtained from sports medicine clinics and hospitals. All subjects received a direct blow to the head resulting in symptoms. Those symptoms that resolved in 9 days or fewer were defined as concussions (n = 3). Those with symptoms lasting longer than 18 months were defined as PPCS (n = 3), and 3 patients presented with SDHs (n = 3). A Hybrid III headform was used in reconstruction to obtain linear and rotational accelerations of the head. These dynamic response data were then input into the University College Dublin Brain Trauma Model to calculate maximum principal strain and von Mises stress. A Kruskal-Wallis test followed by Tukey post hoc tests were used to compare head dynamic and brain tissue responses between injury groups. Statistical significance was set at p \< 0.05. Results A significant difference was identified for peak resultant linear and rotational acceleration between injury groups. Post hoc analyses revealed the SDH group had higher linear and rotational acceleration responses (316 g and 23,181 rad/sec2, respectively) than the concussion group (149 g and 8111 rad/sec2, respectively; p \< 0.05). No significant differences were found between groups for either brain tissue measures of maximum principal strain or von Mises stress. Conclusions The reconstruction of accidents resulting in a concussion with transient symptoms (low severity) and SDHs revealed a positive relationship between an increase in head dynamic response and the risk for more serious brain injury. This type of relationship was not found for brain tissue stress and strain results derived by finite element analysis. Future research should be undertaken using a larger sample size to confirm these initial findings. Understanding the relationship between the head dynamic and brain tissue response and the nature of the injury provides important information for developing strategies for injury prevention. © AANS, 2015.},
keywords = {accident, Accident reconstruction, accidental injury, Accidents, Adolescent, adult, Article, Biomechanical Phenomena, Biomechanics, brain, brain concussion, brain stem, brain tissue, Cerebellum, clinical article, comparative study, Concussion, controlled study, Female, finite element analysis, Finite element modelling, gray matter, Hematoma, human, Humans, Hybrid iii headform, injury severity, laboratory test, Male, Mechanical, mechanical stress, middle aged, pathology, Pathophysiology, Persistent postconcussive symptoms, PHYSIOLOGY, Post Hoc Analysis, Post-Concussion Syndrome, postconcussion syndrome, priority journal, shear stress, simulation, SPORTS medicine, STATISTICAL significance, Stress, stress strain relationship, Subdural, subdural hematoma, traumatic brain injury, white matter, Young Adult},
pubstate = {published},
tppubtype = {article}
}
Timpka, T; Jacobsson, J; Ekberg, J; Finch, C F; Bichenbach, J; Edouard, P; Bargoria, V; Branco, P; Alonso, J M
In: Journal of Science & Medicine in Sport, vol. 18, no. 6, pp. 643–650, 2015.
Abstract | Links | BibTeX | Tags: accident, athletic performance, clinical examination, competition, Concussion, Consensus, Epidemiologic Methods, epidemiological data, EPIDEMIOLOGY, football, head injury, health service, human, Humans, information processing, Injuries, Medline, meta analysis, METHODOLOGY, musculoskeletal disease, neck injury, nomenclature, Overuse injuries, physical education, procedures, Qualitative methods, Research Design, Review, self report, sport injury, Sports epidemiology, sports injury, SPORTS medicine, Systematic Review, tennis, Terminology, Terminology as Topic, track and field, training
@article{Timpka2015,
title = {Meta-narrative analysis of sports injury reporting practices based on the Injury Definitions Concept Framework (IDCF): A review of consensus statements and epidemiological studies in athletics (track and field)},
author = {Timpka, T and Jacobsson, J and Ekberg, J and Finch, C F and Bichenbach, J and Edouard, P and Bargoria, V and Branco, P and Alonso, J M},
doi = {10.1016/j.jsams.2014.11.393},
year = {2015},
date = {2015-01-01},
journal = {Journal of Science \& Medicine in Sport},
volume = {18},
number = {6},
pages = {643--650},
abstract = {Objectives: Consistency in routines for reporting injury has been a focus of development efforts in sports epidemiology for a long time. To gain an improved understanding of current reporting practices, we applied the Injury Definitions Concept Framework (IDCF) in a review of injury reporting in a subset of the field. Design: Meta-narrative review. Methods: An analysis of injury definitions reported in consensus statements for different sports and studies of injury epidemiology in athletics (track and field) published in PubMed between 1980 and 2013 was performed. Separate narratives for each of the three reporting contexts in the IDCF were constructed from the data. Results: Six consensus statements and 14 studies reporting on athletics injury epidemiology fulfilled the selection criteria. The narratives on sports performance, clinical examination, and athlete self-report contexts were evenly represented in the eligible studies. The sports performance and athlete self-report narratives covered both professional and community athletes as well as training and competition settings. In the clinical examination narrative, data collection by health service professionals was linked to studies of professional athletes at international championships. Conclusions: From an application of the IDCF in a review of injury reporting in sports epidemiology we observed a parallel usage of reporting contexts in this field of research. The co-existence of reporting methodologies does not necessarily reflect a problematic situation, but only provided that firm precautions are taken when comparing studies performed in the different contexts. © 2014 Sports Medicine Australia.},
keywords = {accident, athletic performance, clinical examination, competition, Concussion, Consensus, Epidemiologic Methods, epidemiological data, EPIDEMIOLOGY, football, head injury, health service, human, Humans, information processing, Injuries, Medline, meta analysis, METHODOLOGY, musculoskeletal disease, neck injury, nomenclature, Overuse injuries, physical education, procedures, Qualitative methods, Research Design, Review, self report, sport injury, Sports epidemiology, sports injury, SPORTS medicine, Systematic Review, tennis, Terminology, Terminology as Topic, track and field, training},
pubstate = {published},
tppubtype = {article}
}
Levin, B; Bhardwaj, A
Chronic traumatic encephalopathy: A critical appraisal Journal Article
In: Neurocritical Care, vol. 20, no. 2, pp. 334–344, 2014.
Abstract | Links | BibTeX | Tags: accident, alcohol consumption, amnesia, amyloid plaque, animal, Animals, Athletic Injuries, autopsy, behavior change, Brain Injury, Chronic, Chronic traumatic encephalopathy, Chronic Traumatic Encephalopathy Dementia, complication, Diffusion Tensor Imaging, disease course, Encephalopathy, functional magnetic resonance imaging, histopathology, human, Humans, longitudinal study, Male, Neurodegenerative, Neurodegenerative Diseases, nonhuman, NUCLEAR magnetic resonance spectroscopy, Parkinsonism, pathogenesis, pathology, Pathophysiology, Prevalence, priority journal, Pugilistic, Review, risk factor, Risk Factors, sport injury, suicide, Systematic Review, traumatic brain injury, violence
@article{Levin2014,
title = {Chronic traumatic encephalopathy: A critical appraisal},
author = {Levin, B and Bhardwaj, A},
url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84896549537\&partnerID=40\&md5=138104db42f7ca99527a78bb9c821f59},
doi = {10.1007/s12028-013-9931-1},
year = {2014},
date = {2014-01-01},
journal = {Neurocritical Care},
volume = {20},
number = {2},
pages = {334--344},
abstract = {Chronic traumatic encephalopathy (CTE) formerly known as dementia pugilistica is a long-term neurodegenerative disorder associated with repeated subconcussive head injuries in high-contact sports. We reviewed the existing literature on CTE and examined epidemiological trends, risk factors, and its temporal progression, and proposed the underlying pathophysiological mechanisms that may provide unique insights to clinicians with an in-depth understanding of the disease to aid in the diagnosis and prevention, and provide future perspectives for research via search of Medline and Cochrane databases as well as manual review of bibliographies from selected articles and monographs. The prevalence of CTE in recent years is on the rise and almost exclusively affects men, with pathologic signs characterized by progressive memory loss, behavioral changes, and violent tendencies with some patients demonstrating Parkinsonian-like symptoms and signs. Many patients with CTE die following suicide, accident, or complications of drug or alcohol use. Postmortem pathologic analysis is characterized by neurofibrillary tangles and A$beta$ plaques in 50 % of cases. Currently, there are no ante-mortem diagnostic criteria, but modern imaging techniques such as functional magnetic resonance (MR) imaging, MR spectroscopy, and diffusion tension imaging hold promise for delineating the future diagnostic criteria. Further long-term longitudinal studies are warranted to investigate risk factors that will enhance understanding of the disease progression and its pathogenesis. © 2013 Springer Science+Business Media.},
keywords = {accident, alcohol consumption, amnesia, amyloid plaque, animal, Animals, Athletic Injuries, autopsy, behavior change, Brain Injury, Chronic, Chronic traumatic encephalopathy, Chronic Traumatic Encephalopathy Dementia, complication, Diffusion Tensor Imaging, disease course, Encephalopathy, functional magnetic resonance imaging, histopathology, human, Humans, longitudinal study, Male, Neurodegenerative, Neurodegenerative Diseases, nonhuman, NUCLEAR magnetic resonance spectroscopy, Parkinsonism, pathogenesis, pathology, Pathophysiology, Prevalence, priority journal, Pugilistic, Review, risk factor, Risk Factors, sport injury, suicide, Systematic Review, traumatic brain injury, violence},
pubstate = {published},
tppubtype = {article}
}