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Cranfield University Oznur Gulhan Skeletal Sexing CRANFIELD UNIVERSITY OZNUR GULHAN SKELETAL SEXING STANDARDS OF HUMAN REMAINS IN TURKEY CRANFIELD FORENSIC INSTITUTE PhD Thesis Academic Year: 2017-2018 Supervisor: Dr. Karl Harrison March 2017 CRANFIELD UNIVERSITY CRANFIELD FORENSIC INSTITUTE PhD Academic Year 2017-2018 OZNUR GULHAN Skeletal Sexing Standards of Human Remains in Turkey Supervisor: Dr. Karl Harrison March 2017 This thesis is submitted in partial fulfilment of the requirements for the degree of PhD © Cranfield University 2017. All rights reserved. No part of this publication may be reproduced without the written permission of the copyright owner. ABSTRACT The identification of victims involved in mass fatality incidents, as well as the identification of unknown individuals in criminal cases has become an increasingly important issue nowadays. Sex assessment represents a key point in forensic evaluations due to its significance in providing biological identity. Even though the availability of documented skeletal remains to forensic practitioners is a common practice in many countries, in Turkey, contemporary documented skeletal remains are not available for this purpose. For this reason, studies have been focused on living populations. Previous research has shown that modern technologies such as CT scanning present very promising potential in establishing new standards for contemporary populations. Therefore, the main aim of this project was to examine the application of the measurements taken from 3D CT images of the femur in order to assess sex, and to contribute to the establishment of discriminant function equations for the Turkish population for forensic applications. The accuracy and reproducibility of imaging methods in the assessment of the measurements taken from femora are essential when estimating sex. This research also concentrated on determining the accuracy and repeatability of CT measurements, using the femur. Prior to primary data collection, a preliminary study was performed in an effort to test the reliability of the femur measurements. The results of reliability analysis indicated no significant difference between the three observations of each measurement. Thus, the methodology employed in the current study appears reliable and reproducible. In addition, a validation study was conducted to determine the linear measurement accuracy of the 3D volume rendering models derived from a medical CT scanner and the influence of different reconstruction parameters. The differences between measurements obtained from dry bones and their 3D volume rendered models were also evaluated. The results from this study indicated that there were no statistically significant differences between measurements taken from different reconstruction parameters and measurements obtained from CT images and dry i bones. Using the CT data, volume-rendering function (VR), 3D Curved Multiplanar reconstruction (MPR), and Scout View on OsiriX were employed in order to compare the accuracy and reliability of each rendering method and to determine which technique is optimal for linear measurements. Overall, the measurements taken from the 3D Volume Rendering images had the highest intra-observer reliability when compared to the other two rendering methods. This research study produced data and interpretations that will inform on and improve population specific standards of sex assessment from three-dimensional postcranial osteometric landmarks. Additionally, this research is believed to provide value for a developing discipline of forensic anthropology, and integrate within the existing systems of criminal investigation and disaster victim identification practices in Turkey. A Turkish sample population, consisting of 300 adult hospital patients was examined via the interpretation of CT reconstructed images using the OsiriX software. The 3D reconstructions were then created using the volume-rendering function in OsiriX (v.5.6.). Following the 3D reconstruction, an image of each femur was segmented from the surrounding bones to ensure the correct usage of landmarks as accurately as possible. Thirteen measurements were acquired using a 3D viewer after being located and marked on each CT reconstructed femora. These thirteen anthropometric parameters were measured and analysed by basic descriptive statistics and discriminant analysis methods using the SPSS 21.0 software package. The intra-observer variation was assessed by obtaining the intraclass correlation coefficient in order to evaluate the accuracy of the linear measurements taken. Asymmetry was also tested. The results indicated that an accuracy of 92.3% was acquired from a combination of six of the measurements, and the Femur Vertical Diameter of Neck (FVDN) measurement was found to be the most dimorphic with 88.0% accuracy. Keywords: Population specific standards, sex assessment, 3D reconstruction, segmentation, computed tomography, disaster victim identification ii ACKNOWLEDGEMENTS This study would never be possible without the help and support of numerous people and whom I would like to thank here. First and foremost, I would like to thank Karl Harrison for his guidance, encouragement and support throughout the whole process. Second, I would like to acknowledge the members of my doctoral committee, Dr Sophie Beckett and Dr Andrew Shortland for their direction, supervision, and support. Thanks, are then due to Dr Adem Kiriş who provided assistance throughout the data collection. I also greatly appreciate Adrian Mustey for technical support and advice and to Dr Nicholas Marques Grant for providing constructive suggestions. I acknowledge the invaluable assistance of all of the John Radcliffe Hospital. I would also like to thank Sathees Kuttappan and David Shlugman who have willingly donated their time to my work. I also want to thank all my friends, especially Danae Prokopiou, Deborah Harrison, Vivian Christogianni, Özgün Yılmaz, Mary Jane Harding, Constantinos Franceskides, Tobias Shanker, James Martin, Ece Gümüş, Cevriye Doğramacı, Erhan Akın, Özgür Sağ, Nilgün Yılmaz, Mustafa Sağ and Perit Çakır for being there for me. A very special thank you goes to my close friend Nur Akkuş Çakır for all their help and patience through this year especially the last few weeks. I also want to say a huge thank you to Danae Prokopiou who devoted much time and patience in proofreading my dissertation. I would like to thank my entire family, especially Mom and Dad, for their unconditional love, support and constant encouragement during the years of my doctoral studies. Lastly, I also want to acknowledge the Turkish Ministry of Education for providing a fellowship to fund my doctoral education. iii TABLE OF CONTENTS ABSTRACT ......................................................................................................... i ACKNOWLEDGEMENTS................................................................................... iii LIST OF FIGURES ............................................................................................. vi LIST OF TABLES ............................................................................................... x LIST OF EQUATIONS ...................................................................................... xiii LIST OF ABBREVIATIONS .............................................................................. xiv 1 INTRODUCTION ............................................................................................. 1 1.1 General Overview ..................................................................................... 1 1.2 Research Aims and Objectives ................................................................. 5 2 FORENSIC ANTHROPOLOGY ....................................................................... 7 2.1 The Discipline of Forensic Anthropology ................................................... 7 2.2 The Role of Forensic Anthropology........................................................... 8 2.3 History and Development ........................................................................ 11 2.3.1 Themes in Biological Anthropology Relevant to Forensic Anthropology ............................................................................................. 12 2.3.2 History of Forensic Anthropology ..................................................... 27 2.4 Forensic Anthropology in Turkey ............................................................ 36 2.4.1 The establishment of Biological Anthropology in Turkey .................. 38 2.4.2 Development of Research Interests in Biological Anthropology ....... 40 2.4.3 The Development of Forensic Anthropology .................................... 43 3 THEORY OF SKELETAL SEX IN FORENSIC ANTHROPOLOGY ............... 49 3.1 Personal Identification ............................................................................. 49 3.2 Sexual Dimorphism ................................................................................. 54 3.2.1 Individual Variation ........................................................................... 57 3.2.2 Population Specific Approach .......................................................... 58 3.3 Sex Assessment ..................................................................................... 60 3.3.1 Sex Assessment from Adults ........................................................... 61 4 FEMUR.......................................................................................................... 69 4.1 Anatomy of the Femur ...........................................................................
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