Evaluation of Bilateral Asymmetry in Metric Measurements on Tibiae

Year 2020, Issue: 39, 29 - 41, 29.06.2020

Öznur Gülhan

https://doi.org/10.33613/antropolojidergisi.723090

Cited By: 1

Abstract

Creating a biological profile is an important parameter in the identification of skeletal remains in both bioarchaeology and forensic anthropology. In addition, the reliability of the preferred techniques when determining the biological profile affects the accuracy of the results. Bilateral asymmetry is defined as the difference between the measurements of the right and left sides of the human body, and directional asymmetry can be observed in the dimensions of the upper and lower extremities in response to mechanical regression and deformation during bone growth. Especially in forensic anthropological case studies, bilateral variations that can be found in bones while creating a biological profile from skeletal material can cause erroneous predictions. For this reason, if the presence of bilateral asymmetry between these bones is not considered while applying these methods into research, the results may cause erroneous results especially in medico-legal researches. Therefore, it is necessary to investigate the level of bilateral asymmetry before using this bone in methods to create biological profiles due to potential differences between the right and left sides. The aim of this study is to investigate the presence of bilateral asymmetry in the tibia and to examine the differences between the sex. Therefore, tibia images obtained from computerized tomography scans of 32 adult individuals without bone pathology were used in the study. Four metric measurements were taken manually from 3D tibia images processed using the Volume Rendering mode in OsiriX software. According to the statistical results related to bilateral asymmetry, it was observed that most of the tibia measurements taken from the Turkish population showed tendency to the left, but there was no statistically significant difference between the two sides in both sexes. Moreover, apart from the absolute asymmetry percentage value of MTL, there was no significant sex difference for both% AA and % DA values.

Keywords

Bilateral asymmetry, tibia, metric measurements, biological profile, directional asymmetry

Tibia Kemiğine Ait Metrik Ölçümlerde Bilateral Asimetrinin Değerlendirilmesi

Abstract

Biyolojik profil oluşturmak hem biyoarkeolojide hem de adlî antropolojide iskelet kalıntılarının tanımlanmasında oldukça önemli bir parametredir. Ayrıca, biyolojik profil belirlenirken tercih edilen tekniklerin, uygulanan popülasyon için güvenilir olması sonuçların doğruluk oranını oldukça etkilemektedir. Bilateral asimetri, insan vücudunun sağ ve sol taraflarının ölçümleri arasındaki fark olarak tanımlanmakta ve kemik büyümesi sırasında kemiklerin maruz kaldığı mekanik gerileme ve şekil değiştirmeye tepki olarak üst ve alt ekstremitelerin boyutlarında yönel asimetri gözlenebilmektedir. Özellikle adlî antropoloji vaka çalışmalarında iskelet materyalden biyolojik profil oluşturulurken kemiklerde bulunabilecek bilateral varyasyonlar hatalı tahminlere neden olabilmektedir. Bu sebeple, bu kemikler arasında bilateral asimetrinin varlığı, kullanılan yöntemlerde dikkate alınmaz ise çıkan sonuçlar özellikle mediko-yasal araştırmalarda yarardan çok zarara sebep olabilir. Tibia, boy uzunluğu ve cinsiyet tahmininde sıklıkla tercih edilen kemiklerden bir tanesidir. Bundan dolayı, sağ ve sol taraflar arasındaki potansiyel farklılıklar nedeniyle biyolojik profil oluşturmaya yardımcı yöntemlerde kullanmadan önce bilateral asimetri düzeyinin araştırılması gerekmektedir. Bu çalışmanın amacı, tibiadaki bilateral asimetrinin varlığını araştırmak ve cinsiyetler arası farklılıkları incelemektir. Bu sebeple, kemik patolojisi olmayan 32 yetişkin bireyin bilgisayarlı tomografi taramalarından elde edilen tibia görüntüleri araştırmada kullanılmıştır. OsiriX programının hacimsel görüntüleme modu kullanılarak işlenen 3B tibia görüntülerinden dört adet metrik ölçüm manuel olarak alınmıştır. Bilateral asimetri ile ilgili istatistiksel sonuçlara göre, Türk popülasyonundan alınan 32 bireye ait tibia ölçümlerinin birçoğunun sol tarafa eğilimlilik gösterdiği gözlenmekle birlikte, her iki cinsiyette iki taraf arasında istatistiksel olarak anlamlı bir fark bulunmamıştır. Ayrıca, MTL’nin mutlak asimetri yüzde değeri dışında hem %AA hem de %DA değerleri için cinsiyetler arası anlamlı bir fark bulunmamıştır.

Keywords

Bilateral Asimetri, Tibia, Metrik ölçüm, Biyolojik profil, Yönel asimetri

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