Improved femoral micro-architecture in adult male individuals with overweight: fracture resistance due to regional specificities.

BACKGROUND: It is still unclear whether femoral fracture risk is positively or negatively altered in individuals with overweight. Considering the lack of studies including men with overweight, this study aimed to analyze regional specificities in mechano-structural femoral properties (femoral neck and intertrochanteric region) in adult male cadavers with overweight compared to their normal-weight age-matched counterparts. METHODS: Ex-vivo osteodensitometry, micro-computed tomography, and Vickers micro-indentation testing were performed on femoral samples taken from 30 adult male cadavers, divided into the group with overweight (BMI between 25 and 30 kg/m2; n = 14; age:55 ± 16 years) and control group (BMI between 18.5 and 25 kg/m2; n = 16; age:51 ± 18 years). RESULTS: Better quality of trabecular and cortical microstructure in the inferomedial (higher trabecular bone volume fraction, trabecular thickness, and cortical thickness, coupled with reduced cortical pore diameter, p < 0.05) and superolateral femoral neck (higher trabecular number and tendency to lower cortical porosity, p = 0.043, p = 0.053, respectively) was noted in men with overweight compared to controls. Additionally, the intertrochanteric region of men with overweight had more numerous and denser trabeculae, coupled with a thicker and less porous cortex (p < 0.05). Still, substantial overweight-induced change in femoral osteodensitometry parameters and Vickers micro-hardness was not demonstrated in assessed femoral subregions (p > 0.05). CONCLUSIONS: Despite the absence of significant changes in femoral osteodensitometry, individuals with overweight had better trabecular and cortical femoral micro-architecture implying higher femoral fracture resistance. However, the microhardness was not significantly favorable in the individuals who were overweight, indicating the necessity for further research.

Penile Pearls and Pearling: Characteristics and Social Identity from the Perspective of Forensic Pathologists.

Penile pearls are artificial implants placed beneath the skin of a penis to provide enhanced sexual experience for the partner or present a stigma of a particular social subgroup (e.g., prisoner, member of a gang). This genital modification is usually encountered in men of low socioeconomic status and prisoners who might (self) implant improvised pearls under poor sanitary conditions. We have only recently started to encounter penile pearls on autopsy, incidentally. The aim of this study was to analyze our autopsy cases with penile pearls to assess the characteristics of these subjects regarding their socioeconomic status, history of imprisonment, substance abuse, as well as the characteristics of implants. Nineteen men were included. Most were born in the 1970s and 1980s, with only elementary/vocational school education (n = 10). Only five men graduated from high school. At least 14 were in prison at some point in life and 13 were unemployed. Ten men were unmarried. In 11 men, regular alcohol consumption was reported. 12 used illicit substances, most with a history of heroin injection. Penile pearls were improvised and made of rigid plastic in 10 men, eight were of soft silicone-like material, and one was of metal. A distinct characteristic was a ribbed contour of some implants. Although this genital modification seems to gain more attention outside of described vulnerable groups, it mostly remains limited to them in our region. It is most likely performed in improvised, non-professional, unsanitary conditions, probably in prisons.

Extensive direct spreading of "groin hit"-related soft tissue infections: a report of three cases.

We present fatal extensive soft tissue infections, a consequence of groin heroin injection, in three subjects, who were 27, 34, and 39 years old and had a history of over 10-, 15-, and 5-years of heroin injection (cases 1, 2, and 3, respectively). In all cases, the first symptoms of the infection appeared at least a week prior, with rapid deterioration on the last day. The hallmark was a disproportion between external and internal findings in the affected thighs. The latter presented as extensively spread suppurative inflammation with soft tissue necrosis. In case 1, subtle skin erythema was present in the left groin, with a wound suggestive of a recent abscess incision and injection-related scarring. However, dissection revealed that inguinal regions and deep soft tissue (including the muscle sheets) of the left thigh, gluteal region, and lower third of the anterior abdominal wall were inflamed with pus, alongside fibrinopurulent peritonitis. Case 2 had pronounced erythema and swelling of the thigh and knee. Diffuse suppuration was observed upon dissection in the inguinal regions, which extended into the iliopsoas muscles, with soft tissue and muscle necrosis. In the abdominal cavity, we detected 150 mL of serofibrinous exudate. Only case 3 had a prominent, 4 × 3.5-cm necrotic skin defect through which pus spontaneously drained. In contrast to the other two, although extensive pus collection within predominantly necrotic thigh's soft tissue was present, the inflammation did not expand above the inguinal ligament, and peritonitis was not observed. Toxicology analysis excluded acute heroin intoxications.

Micro-scale assessment of bone quality changes in adult cadaveric men with congestive hepatopathy.

Congestive hepatopathy (CH) is a chronic liver disease (CLD) caused by impaired hepatic venous blood outflow, most frequently resulting from congestive heart failure. Although it is known that heart failure and CLDs contribute to increased risk for age-related fractures, an assessment of CH-induced skeletal alterations has not been made to date. The aim of our study was to characterize changes in bone quality in adult male cadavers with pathohistologically confirmed CH compared with controls without liver disease. The anterior mid-transverse part of the fifth lumbar vertebral body was collected from 33 adult male cadavers (age range 43-89 years), divided into the CH group (n = 15) and the control group (n = 18). We evaluated trabecular and cortical micro-architecture and bone mineral content (using micro-computed tomography), bone mechanical competence (using Vickers micro-hardness tester), vertebral cellular indices (osteocyte lacunar network and bone marrow adiposity), and osteocytic sclerostin and connexin 43 expression levels (using immunohistochemistry staining and analysis). Deterioration in trabecular micro-architecture, reduced trabecular and cortical mineral content, and decreased Vickers microhardness were noted in the CH group (p < 0.05). Reduced total number of osteocytes and declined connexin 43 expression levels (p < 0.05) implied that harmed mechanotransduction throughout the osteocyte network might be present in CH. Moreover, elevated expression levels of sclerostin by osteocytes could indicate the role of sclerostin in mediating low bone formation in individuals with CH. Taken together, these micro-scale bone alterations suggest that vertebral strength could be compromised in men with CH, implying that vertebral fracture risk assessment and subsequent therapy may need to be considered in these patients. However, further research is required to confirm the clinical relevance of our findings.

The altered osteocytic expression of connexin 43 and sclerostin in human cadaveric donors with alcoholic liver cirrhosis: Potential treatment targets.

Previous studies suggested that osteocyte lacunar network disruption could play a role in the complex pathophysiology of bone changes in aging and disease. Considering that particular research interest is lacking, we aimed to assess alcoholic liver cirrhosis (ALC)-induced changes in osteocyte lacunar network and bone marrow adiposity. Immunohistochemistry was conducted to assess changes in the micro-morphology of osteocyte lacunar network and bone marrow adiposity, and expression of connexin 43 and sclerostin in vertebral and femoral samples collected from 40 cadaveric men (age range between 44 and 70 years) divided into ALC group (n = 20) and control group (n = 20). Furthermore, the assessment of the potential association between bone changes and the severity of the hepatic disorder (given by Knodell's pathohistologic scoring) was conducted. Our data revealed fewer connexin 43-positive osteocytes per vertebral and femoral bone area (p < 0.01), suggesting defective signal transduction among osteocytes in ALC individuals. Moreover, we found an ALC-induced increase in the number of adipocytes in the vertebral bone marrow (p = 0.038). Considering significant associations between the severity of liver tissue disturbances and impaired functionality of osteocyte lacunar network (Pearson's correlation analyses, p < 0.05), we may assume that timely treatment of the liver disease may delay bone impairment. ALC induced an increase in osteocytic sclerostin expression (p < 0.001), suggesting its role in mediating low bone formation among ALC individuals. Hence, medicaments targeting low bone formation may be beneficial to attenuate the bone changes among ALC patients. However, future clinical studies are required to verify the therapeutic utility of these findings.

Increased Cortical Porosity, Reduced Cortical Thickness, and Reduced Trabecular and Cortical Microhardness of the Superolateral Femoral Neck Confer the Increased Hip Fracture Risk in Individuals with Type 2 Diabetes.

Individuals with diabetes mellitus type 2 (T2DM) have approximately 30% increased risk of hip fracture; however, the main cause of the elevated fracture risk in those subjects remains unclear. Moreover, micromechanical and microarchitectural properties of the superolateral femoral neck-the common fracture-initiating site-are still unknown. We collected proximal femora of 16 men (eight with T2DM and eight controls; age: 61 ± 10 years) at autopsy. After performing post-mortem bone densitometry (DXA), the superolateral neck was excised and scanned with microcomputed tomography (microCT). We also conducted Vickers microindentation testing. T2DM and control subjects did not differ in age (p = 0.605), body mass index (p = 0.114), and femoral neck bone mineral density (BMD) (p = 0.841). Cortical porosity (Ct.Po) was higher and cortical thickness (Ct.Th) was lower in T2DM (p = 0.044, p = 0.007, respectively). Of trabecular microarchitectural parameters, only structure model index (p = 0.022) was significantly different between T2DM subjects and controls. Control group showed higher cortical (p = 0.002) and trabecular bone microhardness (p = 0.005). Increased Ct.Po and decreased Ct.Th in T2DM subjects increase the propensity to femoral neck fracture. Apart from the deteriorated cortical microarchitecture, decreased cortical and trabecular microhardness suggests altered bone composition of the superolateral femoral neck cortex and trabeculae in T2DM. Significantly deteriorated cortical microarchitecture of the superolateral femoral neck is not recognized by standard DXA measurement of the femoral neck.

Vascular Complications in Individuals with Type 2 Diabetes Mellitus Additionally Increase the Risk of Femoral Neck Fractures Due to Deteriorated Trabecular Microarchitecture.

Individuals with diabetes mellitus type 2 (T2DM) have an increased risk of hip fracture, especially if vascular complications are present. However, microstructural origins of increased bone fragility in T2DM are still controversial. DXA measurement of the contralateral hip and three-dimensional microCT analyses of femoral neck trabecular microarchitecture were performed in 32 individuals (26 women and 6 men, 78 ± 7 years). The specimens were divided to two groups: T2DM individuals with hip fracture (DMFx, n = 18) and healthy controls (CTL, n = 14). DMFx group consisted of individuals with vascular complications (DMFx_VD, n = 8) and those without vascular complications (DMFx_NVD, n = 10). T-score was significantly lower in DMFx_VD and DMFx_NVD than in controls (p < 0.001). BV/TV, Tb.N, Tb.Sp, SMI, and FD varied among DMFx_NVD, DMFx_VD, and CTL groups (p = 0.023, p = 0.004, p = 0.008, p = 0.001, p = 0.007, respectively). Specifically, BV/TV of DMFx_VD was significantly lower than that of DMFx_NVD group (p = 0.020); DMFx_NVD group had higher Tb.N and lower Tb.Sp compared with DMFx_VD (p = 0.006, p = 0.012, respectively) and CTL (p = 0.026, p = 0.035, respectively). DMFx group and healthy controls showed similar BV/TV, Tb.Th, Tb.N, Tb.Sp, Conn.D, DA, and FD (p = 0.771, p = 0.503, p = 0.285, p = 0.266, p = 0.208, p = 0.235, p = 0.688, respectively), while SMI was significantly higher in controls (p = 0.005). Two distinct phenotypes of bone fragility were identified in T2DM patients: patients with vascular complications showed impaired trabecular microarchitecture, whereas bone fragility in the group without vascular complications was independent on trabecular microarchitecture pattern. Such heterogeneity among T2DM patients may explain contradicting literature data and may set a basis for further studies to evaluate fracture risk related to T2DM.

Subendocardial hemorrhages in a case of complete avulsion of the heart.

We present a case of a 66-year-old man who died on the scene in a traffic accident. He was a car driver involved in a head-on collision with a bus. Autopsy performed 4 days after death showed multiple head, torso, and limb injuries, including complete avulsion of the heart from the great vessels and avulsion of both lungs from the tracheobronchial tree due to rapid deceleration. Gross examination of the heart was remarkable for patchy hemorrhages beneath the endocardium involving the left side of the interventricular septum and papillary muscles. Histological examination identified streaky subendocardial hemorrhages and perivascular hemorrhages in the subendocardial myocardium. Since the death, in this case, was instantaneous, the most likely mechanism of subendocardial hemorrhages involved a precipitous decrease in left ventricle pressure, as it is improbable that the timeline of events allowed for a catecholamine surge to occur and take effect. Findings in this case also suggest that subendocardial hemorrhages are an indicator of intravital trauma and that the time required for them to develop is very short.

Ruptured femoral artery pseudoaneurysm in drug abuser mimicking homicidal inguinal stab wound.

A 47-year-old woman with a long-term history of intravenous heroin use was found dead lying on the couch in a pool of blood with the wound in her right groin, 15 × 4 mm in diameter. The autopsy revealed the thickened superficial right femoral artery wall and the tract communication between the artery lumen and the skin surface, with pseudoaneurysm formation, confirmed by microscopic examination. Toxicological findings were negative for heroin and its metabolites. The cause of death was fatal blood loss from ruptured chronic femoral pseudoaneurysm. Persons with a long-term history of intravenous drug use experience injection-related problems: prominent vein scarring, lumps, and swelling. The risk of injecting the groin is substantially greater than in typical areas such as the cubital fossa. The proximity of the femoral vein to the femoral artery and nerve poses the risk of accidental trauma to these sites. Accidental groin arterial injections can cause a tear in the arterial wall, on which a pseudoaneurysm can develop. A false or pseudoaneurysm is a breach in the vascular wall leading to an extravascular hematoma that freely communicates with the intravascular space. In the presented case, the autopsy findings pointed out that the fatal blood loss from femoral pseudoaneurysm rupture occurred probably after trivial trauma (shortly after sexual intercourse) or even spontaneously, and not immediately or shortly after arterial drug injection.

Unusual suicidal penetrating heart injury by captive-bolt gunshot.

We present a case of a 56-year-old man who committed suicide using a captive-bolt gun, pressed against the left side of his chest. As the victim worked as a butcher, slaughtering livestock, he owned a captive-bolt gun. Just before committing suicide, he received a disturbing phone call from a person to whom he owed money. The autopsy revealed a 12-mm wound in the left pectoral region with two symmetrical, oval soot deposits. The wound extended through the fifth left rib, the pericardium, and the inferior portion of the anterior wall of the left ventricle. There was a partial-thickness tear in the left aspect of the interventricular septum with associated contusion. About 300 ml of the blood was found within the pericardial sack and about 1200 ml in the left pleural cavity. Atypical location (left chest vs. head), absence of previous suicide attempts and suicide note, and the apparent immediate provoking event suggest abrupt rather than premeditated suicide.

Atypical longitudinal self-inflicted incised wounds as a cause of death in an ecstasy user.

A 32-year-old chronic drug abuser was found dead at the entrance to his home, covered in blood. Pools of blood, bloody footprints and bloodstains were found across the apartment. A double-edged razor was recovered from the scene. Autopsy revealed multiple incised wounds: two on the palmar aspect of both forearms (37 cm and 33 cm long, oriented longitudinally). The cuts extended into the subcutaneous adipose tissue, muscles and blood vessels. There was an additional 30 cm cut extending across the middle of the torso anteriorly and two more cuts on the anteromedial aspect of the lower legs, set symmetrically (about 23 and 25 cm long). These three cuts were more shallow than the upper extremity wounds. No hesitation wounds were identified. Toxicological analysis identified MDMA (ecstasy). The cause of death was exsanguination. The deceased has been using ecstasy for the previous five years and had a history of inpatient psychiatric treatment due to psychosis with delusions and hallucinations. These self-inflicted incised wounds had many atypical features: location (torso, legs and arms), longitudinal orientation and symmetrical distribution, absence of hesitation injuries, use of both dominant and non-dominant hand. The absence of previous suicide attempts and suicide note suggest that these self-inflicted injuries were not planned beforehand, but were abrupt. We hypothesize that this injury pattern is associated with both acute and chronic effects of MDMA.

Bone quality analysis of jaw bones in individuals with type 2 diabetes mellitus-post mortem anatomical and microstructural evaluation.

OBJECTIVES: With the higher risk of dental implant failure with type 2 diabetes mellitus (T2DM), there is a need to characterize the jaw bones in those individuals. The aim of this post mortem study was to compare jaw bone quality of individuals with T2DM to healthy controls. MATERIAL AND METHODS: Bone cores from the edentulous lower first molar region and the region of mandibular angle were collected from male individuals with T2DM (n = 10, 70.6 ± 4.5 years) and healthy controls (n = 11, 71.5 ± 3.8 years) during autopsy. Within the T2DM, a subgroup treated with oral antidiabetics (OAD) and one on insulin were identified. Bone quality assessment encompassed evaluation of bone microstructure, matrix composition, and cellular activity, using microcomputed tomography (micro-CT), quantitative backscattered electron imaging (qBEI), Raman spectroscopy, and bone histomorphometry. RESULTS: In the mandibular angle, T2DM showed 51% lower porosity of the lingual cortex (p = 0.004) and 21% higher trabecular thickness (p = 0.008) compared to control. More highly mineralized bone packets were found in the buccal cortex of the mandibular angle in insulin-treated compared to OAD-treated T2DM group (p = 0.034). In the molar region, we found higher heterogeneity of trabecular calcium content in T2DM insulin compared to controls (p = 0.015) and T2DM OAD (p = 0.019). T2DM was associated with lower osteocyte lacunar size in the trabecular bone of the molar region (vs. control p = 0.03). CONCLUSIONS: Alterations in microstructure, mineralization, and osteocyte morphology were determined in jaw bone of individuals with T2DM compared to controls. CLINICAL RELEVANCE: Future studies will have to verify if the mild changes determined in this study will translate to potential contraindications for dental implant placements.

Cysticercosis and suicide - an example from a forensic collection.

In this case from 1937, the deceased was a 52-year-old female who was suffering from systemic cysticercosis, with prominent neurological and psychiatric symptoms. Given the protracted clinical course and autopsy findings it appears likely that the disease led the woman to commit suicide by ingesting lye, a corrosive substance, and the most common way to commit suicide in Belgrade at the time. The autopsy revealed many rounded transparent cysts, attached to the dura and pia-arachnoid, as well as encapsulated in the intercostal muscles, diaphragm and muscles of the arms, legs and the trunk. Solitary cysticercosis of muscles without involvement of the central nervous system is rare: most soft tissue and muscular cysticercal infections are associated with the central nervous system. Parasites usually lodge in the cerebral cortex or the subcortical white matter, due to the high vascular supply of these areas. Psychiatric symptoms in neurocysticercosis have been frequently reported, along with cognitive decline and intellectual deterioration, depressive disorders, behavioral disturbance and psychosis. Although sporadically, the disease is present even today, and neurocysticercosis is the leading cause of epilepsy in the developing world. To maintain its lifecycle, Taenia solium requires non-industrialized pig rearing conditions, consumption of undercooked pork, and low sanitation standards. Socioeconomic and sanitary improvement and educating people about food processing, the disease and antihelminthic therapy, are important factors contributing to a significant reduction in the prevalence of this potentially eradicable disease worldwide.

Ectopic right thoracic kidney associated with Bochdalek hernia as the cause of diagnostic confusion.

A 61-year-old man who was a psychiatric patient and an alcoholic was admitted to hospital after a fall in his bathroom. He showed signs of hemorrhagic shock, and CT scans showed the presence of the right kidney and part of the right retroperitoneum in the right hemithorax, surrounded by liquid. Surgery showed that the right hemidiaphragm was intact and that no intraabdominal viscera prolapsed into thoracic cavity. The bleeding in the right retroperitoneum was evacuated. The surgical report also stated that "the right kidney and ureter were explored and no injuries or active bleeding were found". The patient died the third day after admission. Autopsy revealed a livid swelling covered with parietal pleura in the right half of the thoracic cavity, behind the costophrenic sinus, about 20 × 15x12 cm in size, filled with about 1500 ml of blood, with ectopic right kidney in the right half of the thorax, slightly rotated posteriorly and downwards. The kidney was smaller (80 g in weight), compared to the normally positioned enlarged left kidney (300 g). The right hemidiaphragm was also intact with small Bochdalek's foramen behind the posterior edge, with communication between the right retropleural and retroperitoneal spaces, through which intact elongated right renal artery (15 cm), vein (14 cm) and ureter were passing. The cause of death was hemorrhagic shock due to retroperitoneal bleeding, with coagulation disorder as possible contributing factor. Intrathoracic kidneys may pose many diagnostic and management dilemmas for clinicians and pathologists. Association between a Bochdalek hernia and an intrathoracic renal ectopia is very rare and may be confusing for doctors in different clinical situations.

Suffocation by massive blood aspiration due to intraoral gun-shot injury -the oldest museum specimen in the Institute of Forensic Medicine in Belgrade.

The forensic museum specimen presented in this paper is the oldest specimen in the collection of the Institute of Forensic Medicine in Belgrade. It comprises a jar containing six cervical vertebras connected to a small amount of dry connective tissue. During the autopsy, the cervical part of the spine was completely opened posteriorly: the base of the odontoid process of the axis was crushed, but the transverse and posterior longitudinal ligaments and the spinal cord were intact. Attached to the specimen, there is a partly cored piece of lead which looks like a severely deformed handgun projectile, approximately 12 mm in diameter. The deceased was a 23-year-old man who committed suicide with a gun in a public park. The gun used was most probably a Nagant M1893 revolver, popular in the region until the end of the Second World War. The pathologist, Dr. Eduard Michel, concluded that the immediate cause of death was asphyxiation due to massive blood aspiration caused by an intraoral gunshot wound. Although the revolver model used is a low-velocity firearm, in such cases the shock wave secondary to the impact of the projectile on the second vertebral bone is likely to have been the cause of widespread neuro-axonal damage at the level of the spinal cord, however, Dr. Michel assumed that death was not instantaneous due to massive hemoaspiration. Nevertheless, without examination of all internal organs and the cervical spine, this case could have remained unexplained.

The banding phenomenon: injury or hypostasis?

Correct interpretation of autopsy findings related to neck structures can be challenging and has tremendous legal importance. We describe a case of a 30-year-old man who was found dead in a hotel courtyard, facedown. The window of his hotel room on the 5th floor was wide open. Police investigation revealed that he was a gambler with many debts, leading them to suspect foul play. The body was transported for a forensic autopsy in a supine position. External examination showed multiple lacerations and contusions of the face and limbs, without signs of external neck injuries. Layer-by-layer neck dissection was unremarkable. Upon opening the pharynx and esophagus, dark purple discoloration of the pharyngeal mucosa could be seen, with a clearly defined margin to the pale circumferential appearance of the rest of the mucosa. To exclude possible tissue bruising due to potential neck compression, histological examination of the mucosa was carried out. Where the mucosa was purple in appearance, there was blood inside the blood vessels, while the vessels of the macroscopically pale mucosa were empty. After forensic autopsy and a detailed police investigation, the manner of death was ruled suicide. In the neck, differential diagnosis between hypostasis and bruising can be especially difficult in rapid, congestive deaths. Forensic pathologists have to be aware of many possible autopsy artifacts in this topographical region, one of those being "banding" of the esophagus. Herein we propose a possible pathophysiological mechanism behind this phenomenon.

Comparative Analysis of Femoral Macro- and Micromorphology in Males and Females With and Without Hyperostosis Frontalis Interna: A Cross-Sectional Cadaveric Study.

We hypothesized that subjects with hyperostosis frontalis interna (HFI), which represents local, endocranial thickening of the frontal bone, would express extra-calvarial manifestations of this condition. Therefore, we compared femoral bone mineral density, geometry, and microarchitecture of males and females with HFI to those without this condition as well as between males and females with HFI. The sample was taken from human donor cadavers, 38 males (19 with and 19 without HFI) and 34 females (17 with and 17 without HFI) that were age-matched within the same sex. The specimens of femoral bones were scanned using microcomputed tomography and dual-energy X-ray absorptiometry (DXA). Parameters of hip structure analysis (HSA) were calculated from data derived from DXA scans. Females with HFI had increased cortical bone volume fraction and their cortical bone was less porous compared to females without HFI. Males with HFI showed microarchitectural differences only with the trabecular bone. They had increased bone volume fraction and decreased trabecular separation compared to males without HFI, although with borderline significance. These microarchitectural changes did not have significant impact on femoral geometry and bone mineral density. The same, still unknown etiological factor behind HFI might be inducing changes at the level of bone microarchitecture at a remote skeletal site (femoral bone), in both sexes. These alterations still do not have the magnitude to induce obvious, straightforward overall increase of bone mineral density measured by DXA. HFI could be a systemic phenomenon that affects both males and females in a similar manner.

Micro-computed Tomography Study of Frontal Bones in Males and Females with Hyperostosis Frontalis Interna.

Hyperostosis frontalis interna (HFI) represents irregular thickening of the endocranial surface of the frontal bone, mostly seen in postmenopausal females. The microarchitecture of this condition is poorly studied. The aim of this cross-sectional autopsy study was to investigate and compare microarchitectural structure of the frontal bone affected with HFI in both sexes and to test whether HFI severity could be distinguished at the microarchitectural level. The sample was taken from human donor cadavers, 19 males (61 ± 15 years old) and 17 females (75 ± 15 years old). After classification of HFI severity (type A, B, C or D), samples of the frontal bone were taken and scanned using micro-computed tomography. Bone volume fraction was higher and total porosity lower only in the outer table of males with HFI, compared to females with HFI. Mean total sample thickness differed only between males with HFI type A and D. Bone microarchitecture between males and females with corresponding HFI types (e.g., male with type A versus female with type A) differed only in HFI type C regarding the fractal dimension of diploe. The degree of anisotropy differed between HFI subtypes in males, but the post hoc analysis revealed no significant differences between individual groups. Other microarchitectural parameters did not differ among males with different HFI subtypes, as well in females, in any part of the frontal bone. There is no difference in microarchitectural structure of the frontal bone between males and females with HFI, in general aspect and within corresponding HFI subtypes. HFI severity could not be distinguished at the microarchitectural level, neither in males nor in females.

Three-Dimensional Microstructural Basis for Differential Occurrence of Subcapital versus Basicervical Hip Fractures in Men.

We analyzed the bone microarchitecture of the subcapital and basicervical subregions of the femoral neck in men, to determine whether microarchitectural differences of cortical or trabecular bone can explain differential frequency of subcapital vs. basicervical fractures, especially in aged persons. The study sample encompassed twenty male proximal femora obtained during autopsy. They were divided in two age groups: young (< 40 years, n = 10) and aged (> 60 years, n = 10). Micro-computed tomography was used to evaluate cortical and trabecular microarchitecture of the subcapital and basicervical regions of the superolateral femoral neck-typical fracture initiation site. Basicervical region showed significantly thicker and less porous cortex than subcapital region (p = 0.02, p < 0.001, respectively), along with increased distance between cortical pores (p = 0.004) and smaller pore diameters (p = 0.069). Higher trabecular number (Tb.N: p = 0.042), lower trabecular thickness (Tb.Th: p < 0.001), and lower trabecular separation (p = 0.003) were also hallmarks of the basicervical compared to subcapital region, although BV/TV was similar in both regions (p = 0.133). Age-related deterioration was mostly visible in trabecular bone (for BV/TV, Tb.Th, Tb.N and fractal dimension: p = 0.026, p = 0.049, p = 0.059, p = 0.009, respectively). Moreover, there were tendencies to age-specific patterns of trabecular separation (more pronounced inter-site differences in aged) and cortical thickness (more pronounced inter-site differences in young). Trabecular microarchitecture corresponded to cortical characteristics of each region. Our study revealed the microarchitectural basis for higher incidence of subcapital than basicervical fractures of the femoral neck. This is essential for better understanding of the fracture risk, as well as for future strategies to prevent hip fractures and their complications.

Closed-head injuries followed by detached brain tissue in the external auditory canals.

We describe five cases of fatally injured males (occupational accident, car driver, pedestrian, motorcyclist and suicidal jump from great height) with one universal autopsy finding - the presence of brain tissue in one or both auditory canals. Internal examination revealed that all victims had multiple head fractures with dura lacerations. In four cases, the petrous part of the temporal bone was fractured (hinge fracture), while in one case the fracture of both the petrous part of the temporal bones and the occipital bone (ring fracture) was present. In all of these cases, considerable pressure was applied to the head, pushing brain tissue equally in all directions (due to incompressibility of the tissue). The tissue followed the path of least resistance, going through the lacerated dura into the fractured petrous part of the temporal bones and finally reaching the middle ear cavity and auditory canal. This phenomenon is almost exclusively encountered in closed-head injuries. In an open-head injury, brain tissue would be expelled through the open bone fracture and scalp wound. The presence of brain tissue in the ears could indicate a hinge or ring fracture in a closed-head injury which occurred as the result of excessive impulse force or considerable pressure applied to the head, i.e. the head was compressed and/or squeezed.