Histological Osteoarthritic Changes in the Human Cervical Spine Facet Joints Related to Age and Sex.

STUDY DESIGN: Cross-sectional autopsy study. OBJECTIVE: Quantify histological changes in the lower cervical spine facet joints with regard to age and sex using systematic random sampling of entire joints. SUMMARY OF BACKGROUND DATA: Neck pain is a common debilitating musculoskeletal condition and one of the highest ranked causes of years lived with disability. The cause of neck pain is multifactorial and osteoarthritis is one potential cause. The cervical spine facet joints have been implicated in the etiology of chronic neck pain. Hence, a detailed description of their anatomy and age- and sex-related changes is needed. METHODS: The lower four cervical spine segments (C4-C7 included) were obtained from 72 subjects during autopsy; 29 women (median age 53 years [22-77]) and 43 men (median age 38 years [20-78]). A total of 1132 articular facets were embedded in toto in hard plastic and sliced into 3-mm thick sections from where 10 µm thick histological sections were produced. Morphological variables were evaluated microscopically and histomorphometric variables were retrieved using random sampling methods. Data were analyzed with a linear regression model. RESULTS: Significant associations were found between increasing age and in particular splitting, fissures, osteophytes, thickness of the calcified cartilage, and subchondral bone plate. The thickness of the calcified cartilage and subchondral bone plate increased with increasing age, whereas the hyaline cartilage thickness decreased. Males had more extensive degenerative changes in the cartilage. CONCLUSION: Using semiquantitative histological methods, degenerative findings were observed at all spinal levels involving the articular cartilage and the osseous structures of the cervical spine facet joints similar to those observed in larger weight-bearing joints. In particular, the thickening of the calcified cartilage and the subchondral bone identified the osteocartilaginous junction as an important area in osteoarthritis. These findings may be relevant for the pathogenesis of osteoarthritis. LEVEL OF EVIDENCE: 3.

Homicide in Greenland 1985-2010.

PURPOSE: Homicide in Greenland has not often been investigated. The latest published study documented a dramatic rise in the homicide rate from around 1/100,000 inhabitants to more than 23/100,000 inhabitants from 1946 to 1984. The aim of our study was to characterize homicides in Greenland from 1985 to 2010 and to compare trends during this period with those in previous studies and with homicide characteristics in Denmark, northern Europe, and other Arctic regions. METHODS: We identified a total of 281 homicides by legal definition and 194 by medical definition, the latter from the years 1990 to 2010. We procured case files for a total of 129 victims (71 male, 58 female) and 117 perpetrators (85 male, 32 female). RESULTS: We identified an overall decrease in the homicide rate during our study period. The decrease in the medical homicide rate was significant (p = 0.007). The homicide rate ranged from 25/100,000 inhabitants to 13/100,000 inhabitants when results were grouped within 5-year periods. There were significantly more male perpetrators (p < 0.001) and among female perpetrators there were significantly more male victims (p < 0.001). Sharp force and gunshot-related killings dominated homicide methods (41 and 29% respectively), with sharp force deaths increasing throughout the investigation period. Altercations were the main motive (49%). Alcohol-related homicides decreased in our study period. CONCLUSIONS: While the Greenlandic homicide rate has decreased, it is markedly higher compared to that seen in Denmark and northern Europe. However, it resembles the rate seen in the rest of the Arctic. Liberal gun laws do not affect the proportion of gun-related killings. Despite the high homicide rate, women account for almost half the victims.

Esophageal injury in fatal rear-impact collisions.

Neck injuries resulting from motor vehicle collisions (MVC), often referred to as whiplash trauma and injury, often demonstrate little or no evidence of significant tissue damage. In rare instances, however, serious injury to the anterior neck organ injuries can result from such trauma. The present study describes esophageal injury associated with rear-impact collisions, based on a unique case report, review of the scientific literature and a query in the National Automotive Sampling System (NASS) database of the US National Highway Traffic Safety Administration. The Medline search and present case study totaled five cases of rear-impact collision-related serious esophageal injury (laceration or rupture). In the four published cases all patients survived, whereas in the presented case study, the patient died due to mediastinitis and sepsis. The NASS query revealed an additional three cases out of a total of 55,926 investigated crashes. All three cases were associated with fatalities. Although no anatomical or bioengineering studies have presented data on the behavior of the esophagus during rear-impact whiplash loading, sudden tensile and/or compressive forces is the likely explanation of injury, often in combination with a local fracture of a vertebral body. In these 8 cases significant esophageal injury carried a substantial (50%) risk of mortality. Clinicians should be aware of the potential for significant complications in the whiplash trauma-exposed patient who complains of chest pain, mid-thoracic pain, discomfort in the neck and throat, respiratory distress, or hoarseness. For those forensic specialists involved in whiplash cases these study results highlight the need to consider esophageal injuries as a rare but potential consequence of whiplash trauma.

Non-fatal injuries to the cervical spine facet joints after a fatal motor vehicle crash: a case report.

Injuries to the lower cervical spine facet joints may be identified in people killed in road traffic crashes. However, many of these injuries are not identified on diagnostic imaging procedures despite histological evidence of injury. This case report illustrates possible non-lethal pathological conditions in the facet joints following fatal road traffic trauma. The cervical spine segments C4 to C7 were removed en bloc and examined with magnetic resonance imaging, computed tomography and conventional radiology. The specimen was fixated in alcohol, embedded in methylmethacrylate, and divided into 3 mm thick parasaggital slices from where 10 microm thick sections were produced and evaluated with light microscopy. Injuries identified on microscopy included haemarthrosis, capsular avulsion, synovial fold contusions and subchondral fractures. None of the injuries were detected on diagnostic imaging or at routine autopsy. Discrete injuries to the cervical spine facet joints were identified using supplemental histological procedures in this case report. Post-mortem diagnostic imaging did not reveal these injuries and future studies should investigate the nature, prevalence and clinical relevance of such lesions.

Pathoanatomy of the lower cervical spine facet joints in motor vehicle crash fatalities.

Non-lethal injuries to the cervical spine facet joints have previously been described in decedents from motor vehicle crashes and in clinical settings these joints have been identified as potential culprits in chronic neck pain syndromes. The aim of this study was to conduct a detailed examination of the lower cervical spine facet joints in a forensic cohort of motor vehicle crash victims and controls using comparable data from medicolegal autopsy, stereomicroscopy and histological evaluations. Injuries to the cervical spine facet joints were common in the trauma cases and included facet fractures, haemarthrosis, and disruption and bleeding in the synovial folds. The injuries could not be reliably verified on stereomicroscopic evaluation, and routine autopsy procedures did not reveal any of the injuries to the facet joints. Despite the presence of these pathoanatomical lesions in road traffic crash fatalities their prevalence and potential clinical implications in survivors from motor vehicle crashes is unknown.

Imaging occult lesions in the cervical spine facet joints.

Discrete injuries in the lower cervical spine facet joints have been reported in studies of motor vehicle crash victims. We conducted a detailed investigation of these joints from 20 motor vehicle crash fatalities and 22 decedents due to nontraumatic causes, using conventional radiology, computed tomography, and magnetic resonance imaging to examine whether the diagnostic imaging procedures could identify injuries in the facet joints. The diagnostic imaging procedures identified facet joint fractures in 4 of the 19 trauma cases with computed tomography having the highest sensitivity and obtaining good correlation with findings from the microscopical evaluation. No diagnostic imaging procedure could reliably evaluate the integrity of the synovial folds or the joint spaces for bleeding despite microscopical evidence of such findings in these structures in a large proportion of the motor vehicle crash fatalities. This study emphasizes the need for scientific evidence of validity and reliability of advanced diagnostic imaging procedures in forensic settings, in particular, with regard to occult soft tissue lesions, and cautions uncritical use of negative results from these procedures until such evidence has been produced.

[Low-speed motor vehicle crashes--marginal values for whiplash-associated disorders]. / Trafikulykker ved lav hastighed--graensevaerdier for whiplash-associated disorders.

Whiplash injuries have increased in numbers during recent decades. The highest incidence rates of whiplash injury are found in low speed motor vehicle crashes during which many vehicles do not sustain significant property damage despite the fact that occupants may suffer personal injury. This article investigates the relationship between car crash velocity changes and residual vehicular damage in low speed crashes and personal injury thresholds. It can be concluded that a personal injury threshold in relation to velocity change and property damage in low speed motor vehicle crashes cannot be established based on scientific evidence.

[Carbon monoxide deaths caused by town gas in Denmark 1995-99]. / Kuliltedødsfald forårsaget af bygas i Danmark 1995-1999.

INTRODUCTION: Over the years town gas has caused many fatal carbon monoxide poisonings. The aim of this paper is to document the circumstances surrounding town gas deaths in Denmark between 1995-1999 and to trace the development of these deaths in recent decades. MATERIALS AND METHODS: A retrospective study of death certificates and report material concerning carbon monoxide deaths in Denmark between 1995-1999 caused by town gas. Of 449 non-fire related carbon monoxide poisonings, 22 (4.9%) were caused by town gas. RESULTS: The deaths consisted of fourteen suicides, six accidents, and two with undetermined manner of death. Ten (71%) of the suicide victims were men and four (29%) were women, with an average age of 48 years (24-82 years); all had turned on two or more gas rings. The accident victims were one man and five women, with an average age of 84 years (77-92 years); all had only turned on one gas ring. CONCLUSION: The number of town gas deaths has been drastically reduced since 1969, which can be explained by the reduced number of town gas installations containing carbon monoxide as well as preventive measures. Most deaths can probably be avoided when the town gas supply is switched to carbon monoxide-free town gas in 2007, but it is important to be aware that incomplete combustion of carbon monoxide-free town gas can still lead to carbon monoxide poisonings.

Sudden infant death syndrome (SIDS)--standardised investigations and classification: recommendations.

Sudden infant death syndrome (SIDS) still accounts for considerable numbers of unexpected infant deaths in many countries. While numerous theories have been advanced to explain these events, it is increasingly clear that this group of infant deaths results from the complex interaction of a variety of heritable and idiosyncratic endogenous factors interacting with exogenous factors. This has been elegantly summarised in the "three hit" or "triple risk" model. Contradictions and lack of consistencies in the literature have arisen from diverse autopsy approaches, variable applications of diagnostic criteria and inconsistent use of definitions. An approach to sudden infant death is outlined with discussion of appropriate tissue sampling, ancillary investigations and the use of controls in research projects. Standardisation of infant death investigations with the application of uniform definitions and protocols will ensure optimal investigation of individual cases and enable international comparisons of trends.

Suicide by carbon monoxide from car exhaust-gas in Denmark 1995-1999.

In the period 1995-1999 there were 388 car exhaust-gas suicides in Denmark. Of these 343 (88.4%) were men and 45 (11.6%) were women, the average age being 47 years. The car exhaust-gas suicides made up 9.3% of all suicides in Denmark in the period. The corresponding rate was 11.7% for men and 3.7% for women. In rural areas a larger part of all suicides were committed with car exhaust-gas compared to the more densely populated areas. Mental disease was diagnosed in 124 (32.0%) cases. A suicide note was found in 165 (42.5%) cases. A hose was fitted to the exhaust pipe in 334 (86.1%) cases. Of these the 234 (60.3%) occurred outside, typically in a forest area, while 76 (19.6%) occurred in a closed garage. All the 54 (13.9%) cases with no hose fitted to the exhaust pipe occurred in a garage. Seven (1.8%) victims were found in a burning or burnt-out car, where the following investigation revealed that it was actually a car exhaust-gas suicide. Carboxyhemoglobin was measured in 26 (6.7%) victims. In two of these victims no carboxyhemoglobin was found, as they had survived for some time after the poisoning. The average saturation of the remaining victims was 67%, the lowest saturation being 20% and the highest being 84%. In the period 1969-1987 the number of car exhaust-gas suicides in Denmark increased from 50 to approximately 190 per year and the rate of car exhaust-gas suicides compared to all suicides increased from approximately 5% to approximately 13%. In 1987-1999 these figures decreased from approximately 190 to 63 per year and from 13% to approximately 8%. During these 30 years the number of passenger cars in Denmark doubled, which explains the increase in car exhaust-gas suicides during 1969-1987. A possible explanation for the decrease in 1987-1999 is the introduction of the catalytic converter, which was made mandatory in 1990. We anticipate that car exhaust-gas suicides will continue to decrease in numbers, as more cars are equipped with catalytic converters.

Examination and identification of a Danish 17th-century nobleman, Laurids Ebbesen : A multidisciplinary study.

Skeletal remains from a crypt in Aarhus Cathedral, where an 87-year-old Danish nobleman, Laurids Ebbesen, was thought to have been buried in 1696 were examined by a multidisciplinary team of investigators. Examination of clothing revealed a burial cap, indicating that he had been a nobleman. Using transition analysis of various bones, the age was estimated at around 82 years (95% confidence interval: 70-92 years). The gender was male. The cranium showed an old, healed fracture in the left temporal region and there was arthritic damage of the vertebral column. In the chapel there were four statues of Laurids Ebbesen (and his three wives). Superimoposition of photographs of Ebbesen's head from the figures onto X-ray and computed tomography images of the skull confirmed that the cranium and the skeleton could have been that of Laurids Ebbesen. Thus, the involvement of a number of disciplines resulted in accurate dating of the burial; determination of the age, gender, an social status of the deceased individual; exclusion of other possible individuals; and comparison of the skull with an image of the deceased.

Ethylene glycol poisoning.

Ethylene glycol (EG) can be found in many agents, such as antifreeze. Ingestion of EG may cause serious poisoning. Adults are typically exposed when EG is ingested as a cheap substitute for ethanol or in suicide-attempts. Children may be exposed by accidental ingestion caused by decantation of EG to unlabeled bottles. EG has in itself a low toxicity, but is in vivo broken down to four organic acids: glycoaldehyde, glycolic acid, glyoxylic acid and oxalic acid. The metabolites are cell toxins that cause central nervous system depression, and cardio-pulmonary and renal failure. Glycolic acid causes severe acidosis, and oxalate is precipitated as calcium oxalate in the kidneys and other tissues. We present five case reports of fatal EG-poisoning, and review the literature concerning clinical presentation and diagnosis, pathological findings, treatment and prevention.

[Traumatic basal subarachnoid hemorrhage]. / Traumatisk basal subaraknoideal blødning.

Massive subarachnoid hemorrhage may occur on a traumatic basis. The injury is most often sustained by a blow with a clenched fist against the posterolateral part of the cranial basis, but the injury may also occur in relation to an accident. The condition is rare, most often occurring in alcohol intoxicated men. The victim typically collapses immediately and usually dies within a few minutes. The origin of the bleeding may be the vertebral artery on the neck or the intercranial basal brain arteries. In some cases the origin of the bleeding cannot be located. The pathogenetic mechanisms have been a subject of discussion. The damage to the artery may occur in relation to a fracture of the transverse process of the atlas or in relation to subluxations in the cervical vertebral column. The arterial rupture may occur in both normal and abnormal arteries. In many of the cases the trauma may be very slight. This has, of course, important legal implications.

[Takayasu's arteritis. An unusual cause of AMI and sudden death in a young man]. / Takayasus arteriitis. En usaedvanlig årsag til AMI og pludselig død hos en ung mand.

The sudden death of a 24-year-old Danish man is reported. Autopsy showed acute myocardial infarction (MI) as the immediate cause of death, together with vasculitis in the aorta and coronary vessels. MI and vascular lesions were attributable to Takayasu's arteritis, which is a well-known cause of cardiovascular disease in Asia. It is rarely seen in Scandinavia and this case represents the first reported MI caused by this disease in Denmark.