Haim Cohen

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Israel Hershkovitz

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Medical University Innsbruck

Mario Hector Aragon

Universidad Autonoma de Coahuila

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University of Alberta

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Papers by Haim Cohen

$Research paper thumbnail of The influence of impact direction and axial loading on the bone fracture pattern$

The influence of impact direction and axial loading on the bone fracture pattern

Forensic science international, 2017

The effect of the direction of the impact and the presence of axial loading on fracture patterns ... more The effect of the direction of the impact and the presence of axial loading on fracture patterns have not yet been established in experimental 3-point bending studies. To reveal the association between the direction of the force and the fracture pattern, with and without axial loading. A Dynatup Model POE 2000 (Instron Co.) low energy pendulum impact machine was utilized to apply impact loading on fresh pig femoral bones (n=50). The bone clamp shaft was adjusted to position the bone for three-point bending with and without additional bone compression. Four different directions of the force were applied: anterior, posterior, lateral, and medial. The impacted aspect can be distinguished from the non-impacted aspects based on the fracture pattern alone (the most fractured one); the impact point can be identified on bare bones (the area from which all oblique lines radiate and/or the presence of a chip fragment). None of our experiments (with and without compression) yielded a "tru...

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Sex estimation using computed tomography of the mandible

International journal of legal medicine, Jan 20, 2017

Sex estimation of skeletal parts is of great value even in the DNA era. When computed tomography ... more Sex estimation of skeletal parts is of great value even in the DNA era. When computed tomography (CT) facilities were introduced to forensic institutes, new possibilities for sex estimation emerged. The aim of this study was to develop a CT-based method for sex estimation using the mandible. Twenty-five CT-based measurements of the mandible were developed and carried out on 3D reconstructions (volume rendering) and cross sections of the lower jaw of 438 adult individuals (214 males and 224 females). Intraobserver and interobserver variances of the measurements were examined using intraclass correlation coefficient (ICC) analysis. Five discriminant functions were developed using different states of completeness of the mandible. The success rates of these equations were cross validated twice. The measurements were found to be highly reliable (for intraobserver 0.838 < ICC < 0.995 and for interobserver 0.71 < ICC < 0.996). For a complete mandible, the correct classification...

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$Research paper thumbnail of The effect of impact tool geometry and soft material covering on long bone fracture patterns in children$

The effect of impact tool geometry and soft material covering on long bone fracture patterns in children

International Journal of Legal Medicine, 2017

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$Research paper thumbnail of The impact velocity and bone fracture pattern: Forensic perspective$

The impact velocity and bone fracture pattern: Forensic perspective

Forensic Science International, 2016

Studies on bone-energy interaction are meager and revealed only a general correlation between the... more Studies on bone-energy interaction are meager and revealed only a general correlation between the fracture pattern and the mechanism of the insult. This study has two objectives, to establish a usable fracture analysis method and to reveal the association between the energy of the force and the fracture pattern. Dynatup Model POE 2000 (Instron Co.) low energy pendulum impact machine was utilized to apply impact loading on fresh pig femoral bones (n = 30). The bone clamp shaft was adjusted to position the bone for three-point bending with additional bone compression. Three different velocities of the forced applied were carried out. On average, the number, length and the curviness of the fracture lines created under moderate and highenergy impact is significantly higher compared to a low-energy impact. Most fractures lines were located on the impacted aspect in bones subjected to moderate-and high-velocity impact. Four oblique-radial fracture lines running from the point of impact creating a double butterfly pattern were found in bones subjected to moderate and high-velocity impact. Only ''false'' wedge-shaped (butterfly) fragments were found in the current study. Our results suggest an association between fracture pattern and the velocity of the impact.

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Vertebral hemangiomas: their demographical characteristics, location along the spine and position within the vertebral body

European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society, Jan 19, 2015

Vertebral hemangiomas (VHs) are the most common form of benign tumors in the spine. The aim of th... more Vertebral hemangiomas (VHs) are the most common form of benign tumors in the spine. The aim of this research was to study the prevalence of VHs in the human population, their distribution along the spine and their location in the vertebral body. The presence of VHs was assessed in full spine CT scans of 196 adults. Demographic data were gathered from medical records. VHs were present in 26.0 % of the individuals studied, a rate significantly higher (χ (2) = 43.338, p < 0.001) than the prevalence reported in the literature (10.7 %). Multiple VHs (≥2) appeared in 7.2 % of the population studied. VHs prevalence is sex-independent, appearing in 28.6 % of females and 23.5 % of males (χ (2) = 0.663, p = 0.416); and age-dependent: the mean age of affected individuals (65.8 years) was significantly higher (p < 0.001) than unaffected individuals (56.2 years). VH size was also age-dependent (p = 0.023). No vertebra was significantly more prone to be affected by a hemangioma. T11 and T12...

Musculoskeletal wounds characteristic of the Second Lebanon War

Forensic Medicine and Anatomy Research, 2013

The Second Lebanon War between Hezbollah and Israel broke out on July 12, 2006, and lasted until ... more The Second Lebanon War between Hezbollah and Israel broke out on July 12, 2006, and lasted until August 14, 2006. Out of the wounded Israeli soldiers, 128 were treated at the orthopedic departments of the Rambam Medical Center, Haifa, Israel. A retrospective study was carried out on these 128 combatants. The objective of the study was to characterize musculoskeletal combat wounds with regard to age, type, location, mechanism, side and intensity. The average age of an injured soldier was 25.7 years. Most injuries (63.9%) were caused by shrapnel. The prevalence of injury to the lower limb was much higher compared with upper limb (43.4% vs. 28.3%). There was no side preference. A considerable number of soldiers had more than one injury (60%). The majority of wounds that occurred in the Second Lebanon War were orthopedic-related, particularly involving the upper and lower extremities. Fragmenting weapons were responsible for most injuries.

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Facet Joints Arthrosis in Normal and Stenotic Lumbar Spines

Spine, 2011

ABSTRACT: Study Design. A descriptive CT study of lumbar facet joint (FJ) arthrosis in general an... more ABSTRACT: Study Design. A descriptive CT study of lumbar facet joint (FJ) arthrosis in general and spinal stenosis populations.Objective. To reveal the prevalence of FJ arthrosis in general and stenosis populations and to establish its relationship to age and gender.Summary of Background Data. FJ arthrosis is a common radiographic finding and has been suggested as a cause of low back and lower extremity pain. It is also considered a dominant player in the genesis of lumbar spinal stenosis. Although it is well accepted that FJ arthrosis is an age dependent phenomenon, controversies still exist as to its association with gender and its prevalence at different spine levels. Additionally, data on FJ arthrosis frequency in spinal stenosis population are missing.Methods. Two groups were studied. The first included 65 individuals with LSS (mean age 66 ± 10 years) and the second, 150 individuals (mean age 52 ± 19 years) without LSS related symptoms. Both left and right FJ arthrosis for each vertebral level (L3 to S1) were evaluated on CT images (Brilliance 64, Philips Medical System, Cleveland Ohio). Chi-Square, Linear-by-Linear Association and McNemar test were carried out to reveal the correlation between FJ arthrosis and demographic factors (age, gender) and prevalence at different lumbar levels in both stenosis and non-stenosis groups. Additionally, a 2-way ANOVA was used to determine the association between BMI and FJ arthrosis.Results. The rate of FJ arthrosis at L3-4 and L4-5 were significantly higher (P&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;0.001) in the stenotic group compared to the control. In the control group the prevalence of FJ arthrosis increases cephalo-caudally (L3-L4 = 16%, L4-L5 = 28%, L5-S1 = 55%), whereas in the stenotic group there is a sharp increase from L3-4 (27%) to L4-5 (58%), but not from L4-5 to L5-S1 (55%). No association between FJ arthrosis and gender was noted. Although, mean BMI was significantly smaller in the control group compared to the stenotic group, no association between BMI and facet arthrosis was found. In the general population the prevalence of FJ arthrosis at all three levels was greater for the right side; however, significant difference (P = 0.004) was obtained only for L3-4. In all joints studied, the prevalence of FJ arthrosis increases considerably from the young age cohort (18-39) to the old age cohort…

Computed tomography-enhanced anatomy course using enterprise visualization

Anatomical Sciences Education, 2013

Rapid changes in medical knowledge are forcing continuous adaptation of the basic science courses... more Rapid changes in medical knowledge are forcing continuous adaptation of the basic science courses in medical schools. This article discusses a three-year experience developing a new Computed Tomography (CT)-based anatomy curriculum at the Sackler School of Medicine, Tel Aviv University, including describing the motivations and reasoning for the new curriculum, the CT-based learning system itself, practical examples of visual dissections, and student assessments of the new curriculum. At the heart of this new curriculum is the emphasis on studying anatomy by navigating inside the bodies of various living individuals utilizing a CT viewer. To assess the students&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39; experience with the new CT-based learning method, an anonymous questionnaire was administered at the end of the course for three consecutive academic years: 2008/2009, 2009/2010, 2010/2011. Based upon the results, modifications were made to the curriculum in the summers of 2009 and 2010. Results showed that: (1) during these three years the number of students extensively using the CT system quadrupled (from 11% to 46%); (2) students&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39; satisfaction from radiologists involvement increased by 150%; and (3) student appreciation of the CT-based learning method significantly increased (from 13% to 68%). It was concluded that discouraging results (mainly negative feedback from students) during the first years and a priori opposition from the teaching staff should not weaken efforts to develop new teaching methods in the field of anatomy. Incorporating a new curriculum requires time and patience. Student and staff satisfaction, along with utilization of the new system, will increase with the improvement of impeding factors.

Hyperostosis frontalis interna: criteria for sexing and aging a skeleton

International Journal of Legal Medicine, 2010

Estimation of sex and age in skeletons is essential in anthropological and forensic medicine inve... more Estimation of sex and age in skeletons is essential in anthropological and forensic medicine investigations. The aim of the current study was to examine the potential of hyperostosis frontalis interna (HFI) as a criterion for determining sex and age in forensic cases. Macroscopic examination of the inner aspect of the frontal bone of 768 skulls (326 males and 442 females) aged 1 to 103, which had undergone a head computerized tomography scan, was carried out using the volume rendering technique. HFI was divided into two categories: minor and major. HFI is a sex- and age-dependent phenomena, with females manifesting significantly higher prevalence than males (p&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;0.01). In both females and males, prevalence of HFI increases as age increases (p&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;0.01). We present herein the probabilities of designating an unknown skull to a specific sex and age cohort according to the presence of HFI (standardized to age distribution in an Israeli population). Moreover, we present the probability of an individual belonging to a specific sex or age cohort according to age or sex (respectively) and severity of HFI. We suggest a valid, reliable, and easy method for sex and age identification of unknown skulls.

$Research paper thumbnail of The influence of impact direction and axial loading on the bone fracture pattern$

The influence of impact direction and axial loading on the bone fracture pattern

Forensic science international, 2017

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Sex estimation using computed tomography of the mandible

International journal of legal medicine, Jan 20, 2017

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$Research paper thumbnail of The effect of impact tool geometry and soft material covering on long bone fracture patterns in children$

The effect of impact tool geometry and soft material covering on long bone fracture patterns in children

International Journal of Legal Medicine, 2017

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$Research paper thumbnail of The impact velocity and bone fracture pattern: Forensic perspective$

The impact velocity and bone fracture pattern: Forensic perspective

Forensic Science International, 2016

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Vertebral hemangiomas: their demographical characteristics, location along the spine and position within the vertebral body

European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society, Jan 19, 2015

Musculoskeletal wounds characteristic of the Second Lebanon War

Forensic Medicine and Anatomy Research, 2013

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Facet Joints Arthrosis in Normal and Stenotic Lumbar Spines

Spine, 2011

Computed tomography-enhanced anatomy course using enterprise visualization

Anatomical Sciences Education, 2013

Hyperostosis frontalis interna: criteria for sexing and aging a skeleton

International Journal of Legal Medicine, 2010

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