Gérald Quatrehomme

Identification by frontal sinus pattern in forensic anthropology

The authors report forensic cases from the literature, as well as two personal homicide cases, of identification through comparison of frontal sinus radiographs. A general discussion about identification using frontal sinus X-rays is presented, pointing out the reliability of the method, in reference to the uniqueness of the frontal sinus in humans, but also some difficulties, especially in reference to the distance, orientation and angle of the X-ray technique.

Scanning Electron Microscopy Analysis of Experimental Bone Hacking Trauma

The authors report on their macro- and microscopy study of bone lesions made by a sharp force instrument (a single blade knife), and a sharp-blunt instrument classified as a chopping weapon (a hatchet). The aim of this work was to attempt to identify the instrument by analyzing the general class characteristics of the cuts. Each weapon was used on human bones. The results indicate that macroscopic analysis is more problematic. The microscopic analysis assessed that characteristics examined were effective in distinguishing sharp from sharp-blunt injury to the bone. The microscope facilitates analysis unachievable with macroscopic methods, some three-dimensional characteristics not visible to the naked eye being clearly defined with its use. Emphasis has been placed on the value of SEM as an anthropologists tool in bone lesion injuries.

Aristolochic acid (AA)-DNA adduct as marker of AA exposure and risk factor for AA nephropathy-associated cancer.

Volker M. ARLT*, Véronique ALUNNI-PERRET, Gérald QUATREHOMME, Patrick OHAYON, Laetitia ALBANO, Hacène GAı̈D, Jean-Francois MICHIELS, ALAIN MEYRIER, Elisabeth CASSUTO, Manfred WIESSLER, Heinz H. SCHMEISER and Jean-Pierre COSYNS Section of Molecular Carcinogenesis, Institute of Cancer Research, Sutton, United Kingdom Department of Clinical Forensic Medicine and Forensic Pathology, Hôpital Pasteur, Nice, France Department of Nephrology, Hôpital Pasteur, Nice, France Department of Pathology, Hôpital Pasteur, Nice, France Department of Nephrology, Hôpital Européen Georges Pompidou, Paris, France Division of Molecular Toxicology, German Cancer Research Center, Heidelberg, Germany Department of Pathology, UniversitéCatholique de Louvain Medical School, Brussels, Belgium

Analysis of beveling in gunshot entrance wounds

The analysis of skeletal trauma is an important aspect of forensic case work. Yet most major pathology references devote limited attention to this topic. The aim of this paper is to analyze beveling in gunshot entrance wounds, from a series of 27 cases with a total of 39 wounds. Assessment was made by measuring the external and internal cranial dimensions, describing the area of most pronounced beveling, and correlating the directions of the beveling with the trajectory of the bullet. Results indicated that inward beveling was found in 36 of 39 cases, the absence of beveling in four bones, and actual external beveling in one case. The inconsistency in the direction of most pronounced beveling in reference to the direction of shooting leads to the conclusion that this characteristic cannot be used to make a reliable assessment of the direction of fire.

Gunshot wounds to the skull: Comparison of entries and exits

Specific features usually allow recognition of entrance and exit wounds in bones. Exits are often more irregular, and usually larger than entrances. The aim of this paper is to compare the size of 17 entrance and exit gunshot wounds from a series of 13 forensic cases. The results of this work confirm the usually accepted fact that exit wounds in bones tend to be larger than the entrances resulting from the same shot. In all but one case the exits were larger than the entrances in this study. Though the bullet loses velocity after penetrating, the ballistic behavior (deformation and instability of the projectile) explains this tendency.

A comparison between neural network and other metric methods to determine sex from the upper femur in a modern French population.

Forensic anthropologists are frequently asked to assess partial or badly damaged skeletal remains. One such request led us to compare the predictive accuracy of different mathematical methods using four non-standard measurements of the proximal femur (trochanter-diaphysis distance (TD), greater-lesser trochanter distance (TT), greater trochanter width (TW) and trochanter-head distance (TH)). These measurements were taken on 76 femurs (38 males and 38 females) of French individuals. Intra- and inter-observer trials did not reveal any significant statistical differences. The predictive accuracy of three models built using linear and non-linear modelling techniques was compared: discriminant analysis, logistic regression and neural network. The neural network outperformed discriminant analysis and, to a lesser extent, logistic regression. Indeed, the best results were obtained with a neural network that correctly classified 93.4% of femurs, with similar results in males (92.1%) and females (94.7%). Univariate functions were less accurate (68-88%). Discriminant analysis and logistic regression, both using all four variables, led to slightly better results (88.2% and 89.5%, respectively). In addition, all the models, save the neural network, led to unbalanced results between males and females. In conclusion, the artificial neural network is a powerful classification technique that may improve the accuracy rate of sex determination models for skeletal remains.

Assessment of the accuracy of three-dimensional manual craniofacial reconstruction: a series of 25 controlled cases

The aim of this work was to estimate the accuracy of craniofacial reconstruction (CFR), from a series of 25 controlled cases. Three protocols of blind CFRs (exhibiting an increasing complexity from A to C) were assessed in this paper, allowing comparison of the CFR with the actual face of the deceased. The whole results showed that an excellent, or good, to middle resemblance (between the blind CFR and the actual face of the subject) was reached in 9 out of 25 cases, but the success gradually increased from the A to the C protocol of CFR, reaching six cases out of eight in the latter. Statistical comparison of measurements (between the blind CFR and the actual face) was also achieved, revealing that some anthropological distances were constantly underestimated or overestimated. This experiment shows that a thorough anthropological, odontological, and X-ray analysis is indispensable before performing a CFR, and these encouraging results justify further efforts of research in this field.

Odontometrical method useful in determining gender and dental alignment

Rao et al.s method of sex determination, which considers the mandibular canine index (MCI) is one giving satisfactory results. However, they did not take occlusion into consideration. The aim of this study, therefore, was to evaluate the effectiveness of this method with respect to tooth alignment. The study population involved the students enrolled in the University of Nice-Sophia Antipolis. Two hundred and ten girls and 214 boys were randomly sampled (1/20). Both tooth sizes and dental arches were measured using a vernier calliper to calculate MCI for both sexes. The results were compared to standard MCI, taking into account tooth alignment.Rao et al.s method can only be used in the case of correct lower-anterior dental alignment and by using the standard MCI of the local population.

Experimental Single Controlled Study of Burned Bones: Contribution of Scanning Electron Microscopy

Burned bones were studied using Scanning Electron Microscopy. The samples were cut from a maxillary-mandibular block taken during an autopsy. These fragments were heated in a furnace under controlled temperature conditions for 60 minutes. The temperatures ranged from 150 to 1150 degrees Celsius. The results are as following: (i) there are significant alterations of the bone, more and more obvious as the temperature increases, (ii) it appears to be difficult to establish a precise correlation between the temperature and the scanning electron microscopy patterns.

Acute Arsenic Intoxication: Forensic and Toxicologic Aspects (An Observation)

The authors report on an acute suicidal arsenic intoxication (di-arsenic-trioxide). Death can occur one week after ingestion, despite intensive care. The forensic, anatomopathological and toxicologic aspects are reported. Forty titrations are realized at the level of the biologic fluid in viscera, by absorption spectrophotometry. These data are compared with those in standing literature, especially with the rates determined in normal subjects, following simple environmental impregnation.