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Correlation Analysis of Greater Sciatic Notch Dimensions and His Index in Gender Prediction Based on Hip Bone

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Correlation Analysis of Greater Sciatic Notch Dimensions and His Index in Gender Prediction Based on Hip Bone International Journal of Multidisciplinary and Current Educational Research (IJMCER) ISSN: 2581-7027 ||Volume|| 3 ||Issue|| 3 ||Pages 175-183 ||2021|| Correlation analysis of greater sciatic notch dimensions and his index in gender prediction based on hip bone 1,Aida Sarač – Hadžihalilović, 2,Emir Beganović, 3,Zurifa Ajanović, 4,Ilvana Hasanbegović, 5,Lejla Dervišević, 6,Senad Šljuka 1,3,4,5Department of Anatomy, Faculty of Medicine, University of Sarajevo, Bosnia and Herzegovina 2 Fachklinik fur Amputationsmedizin. Osterhofen, Bayern, Germany 6 Department of Biology, Faculty of Science, University of Sarajevo, Bosnia and Herzegovina ABSTRACT BACKGROUND/AIM: The greater sciatic notch is important because the gender of the hip bone can be determined on the basis of its appearance and dimensions. Important parameters that are taken into consideration when measuring greater sciatic notch dimensions are: the width and depth of the greater sciatic notch, the width of the upper part of greater sciatic notch. It is important to monitor the ratio of the width and depth of the notch, when assessing the appearance alone. The aim of the study was to determine correlations between the upper part of the greater sciatic notch with the values of it’s width, as well as between depth and width of the upper part of the great sciatic notch. MATERIALS AND METHODS: The study was conducted prospectively on 98 hip bone, of which 56 were single and 42 were within the pelvis. The gender and age of the bones were unknown. All bones belonged to adults in the Bosnian population. The research is based on the osteometric measurements of the width and depth of the greater sciatic notch and width of the upper part of greater sciatic notch, that was used for index calculations of the upper part of the greater sciatic notch. CONCLUSION: We recommend the unique formula for index calculations of the upper part of the greater sciatic notch I=K + (s ×AC̅̅̅̅). KEY WORDS: Hip bone, pelvis, sexual dimorphism, osteometry I. INTRODUCTION Gender differentiation using bones, remains very important as we strive to do it on the best and simplest possible way in very short time. Different parts of the human skeleton carry different morphological characteristics that can serve to determine gender with a certain degree of certainty. The pelvis is the part of the human skeleton that meets best these purposes, due to the fact that pelvis has numerous details that can reveal sexual differences. The pelvis is one of the most massive parts of the sceleton that decompose slower than others, and as such can surve these purposes – which is proven in number of recent studies [1, 2, 3]. In the first half of the XX century it was proven that pelvis has the most important role in determining gender - based on skeleton, especially it's upper and lower openings, greater sciatic notch and subpubic angle [4]. Many authors suggest formulas obtained using discriminant functional analysis for gender determination using hip bone. However, the authors state that the formulas are more accurate if they are used to determine sex based on the hip bone of individuals from the same population. The aim of this study was to determine whether there really are population differences on the hip bones. The study was conducted on hip bones from three different populations measuring seven standard measures. The results of the study showed that there were, but no significant differences in the accuracy of pelvic sex determination between different populations [1]. Steyn et al. observed the pelvis as a whole, and separately the hip bone and the sacrum. The study showed that the accuracy of gender assessment was the highest when the hip bone was observed, 79.1 - 93.5%. Between individual bone elements, the diameter of acetabulum performed the greatest precision for gender determination, 83.9% average [5]. Pelvic-based sexual dimorphism in children was demonstrated by Shutowski, indicating that male specimens had a narrower and deeper sciatic notch compared to female specimens [6]. A significant number of papers that dealt with skeletal gender predictions considered both population and racial affiliation. Patriquin et al. reported that the length of ischium (86% accuracy) was the most characteristic parameter for white population, while the acetabulum diameter (84% accuracy) was characteristic for Afro-American population. [7]. The authors referred that female type of sciatic notch (width is larger and depth is smaller) had bigger prevalence in English population compared to Americans | Volume 3 | Issue 3 | www.ijmcer.com | 175 | Correlation analysis of greater sciatic notch… of either European or African descent. These population differences are most likely due to various environmental influences (e.g., vitamin D deficiency) [8]. There are many methodological approaches were employed in pelvic gender dimorphisam verification, resulting in extensive literature. Some authors observed different diameters of the pelvis, using classical morphometry and deriving specific indices based upon the gender of examined material [9, 10, 11, 12, 13]. The nature has allowed the individual anatomical variation and departures from the set norms within each sex. In addition, these variations are affected by multiple etiological factors such as cultural, environmental and genetic elements [10]. The aim of our study was to examine the correlations of the index of the upper part of the greater sciatic notch with the values of its width, depth and width of the upper part of the greater sciatic notch, as well as developing regression equation for calcuting the index of the upper part of great sciatic notch. Study of Sandhya et al reported that the mean value of width of the greater sciatic notch in female was bigger, while the greater sciatic notch was deeper in male hip bone, as well as male hip bone had higher mean value of greater sciatic notch [14]. It was well known from the literature that sex determination based on pelvic bone is possible with 80% accuracy. Sciatic notch variation was greater in females than in males, while age did not show significance [15]. Dnyanesh analyzed sexual dimorphism on 100 hip bones, where the author measured and calculated seven parameters: maximum width, maximum depth, posterior segment, index I, index II, total angle and posterior angle. Results of this study showed that sexual dimorphism was expressed on all parameters, except maximum depth [16]. Gender differences in the human pelvis are conditioned by its adaptive functions. The irregular shape of the hip bone is caused by forces acting on its. This primarily refers to the upright position of the body and the transfer of the weight from superior part of the body to the legs, as well as the function of the birth canal in women. The function of transferring body weight to the legs affected the size and shape of the bone, while the function of the birth canal in women primarily affected the shape of the pelvis. In addition, sexual selection has made sexual dimorphism even more pronounced. Thus, the overall shape of the pelvis is conditioned by its function gender differences in the human pelvis are conditioned by its adaptive functions [17]. II. MATERIALS AND METHODS The study was designed as a prospective osteometrical and it was conducted in osteological cabinets at Department of Anatomy, Faculty of Medicine, University of Sarajevo. Total of 56 individualhip bone (34 left and 22 right) and 21 pelvis sample were observed (total of 98 hip bone - 43 right and 55 left). The pelvis and hip bones originated from Bosnia and Herzegovina adult population of unknown age and gender. Three parameters were measured: the width and the depth of the greater sciatic notch and the width of the upper part of the greater sciatic notch. In our study, point B was marked on the basis of ischial spine, because the very tip of the mentioned spine was ruined on most specimens. This marking of the lower limit of the great sciatic notch has already been described in the literature by Genoves [18]. Point A is posterior inferior iliac spine. Some authors used piriform tubercule. We did not use it because it is very variable and often absent. According to Lazorthesu i Lhezu piriform tubercule is absent in 27% cases on right side and 24,4% cases on left side in female Point D is the deepest point of the great sciatic notch [19]. Point C is at the intersection of (̅퐀퐁̅̅̅) - width of the greater sciatic notch with (퐂퐃̅̅̅̅) - depth of the greater sciatic notch. The index of the upper part of the great sciatic notch was calculated as the ratio of the width of the upper part of the great sciatic notch and the maximum depth of the great sciatic notch. | Volume 3 | Issue 3 | www.ijmcer.com | 176 | Correlation analysis of greater sciatic notch… Figure 1 - Dimensions of the great sciatic notch (A- posterior inferior iliac spine; B – ischial spine; (̅퐀퐁̅̅̅) - width of the greater sciatic notch; (퐂퐃̅̅̅̅) - depth of the greater sciatic notch, (̅퐀퐂̅̅̅) - width of the upper part of the greater sciatic notche [Osteological colletion of the department of Anatomy]. 푨푪̅̅̅̅ I= [20] 퐂퐃̅̅̅̅ This index shows the ratio of AC and CD, as how many times the AC is smaller than the CD. All of the hip bones that where with the width of the upper part of the greater sciatic notch more that 0.70 times lower than the depth (index of the upper part of greater sciatic notch I <0.70), were characterized as reliably male hip bone. If the index of the upper part of the greater sciatic notch showed values above I> 0.70, the hip bones were characterized as reliably female bones [20]. Quantitative data were collected using an electronic digital calliper (ATD – 8657; 0 – 150 mm; Manufacturer ATD Tools, Inc.
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