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Category: Volume 06 Issue 05 May 2018
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Title: Study of Neck-Shaft Angle of Adult Femur in Relation to Sex and Bilateral Asymmetry in Population of Bihar

Author: Vineeta Laxmi

 DOI:  https://dx.doi.org/10.18535/jmscr/v6i5.181

Abstract

Background: The femoral neck shaft angle (NSA) is an angle between the long axis of shaft and long axis of neck of femur. It is formed between the obliquely oriented neck of femur with the vertical shaft of femur. Measurement of femoral neck shaft angle is an important parameter for evaluation of biomechanics of hip joint. Variation in neck-shaft angle has been noted among different age, sex and ethnicity. Though, more detail studies are required to significantly establish the variation among different sex. The normal range of neck-shaft angle varies from 120˚– 145˚ with an average value of 135˚[1,2].  Although, it is stated in various literature that neck shaft angle is lower in females, that ranges between 119˚ – 137˚[3]. Objective of this study was to find out the neck shaft angle of femur among adult population of Bihar in relation to sex and side and its comparison with previous studies

Materials and Methods: Present study was conducted on 62 dry skeletal collections of human femora collected from Osteology section of different medical colleges of Bihar from October 2016 to February 2017. The femoral neck shaft angle was measured by hand-held 360˚ goniometer.

Results: Neck-shaft angle was measured in 62 dry skeletons of femur. Among which, 33 were determined as male and 29 were determined as female. Out of 62 femurs, 32 were of right side and 30 were of left side. The results of present study are neck shaft angle of femur was 136.55˚ ± 5.23mm. Male femoral neck shaft angle was 140˚ ± 1.27mm and female femoral neck shaft angle was 132.62˚ ± 5.26mm. Neck shaft angle of right femur was 136.78˚ ± 5.16mm and, that of left femur was 136.3˚ ± 5.38mm. A significant difference in male and female neck shaft angle was found. However, there was no any statistically significant difference in right and left mean neck shaft angle was found.

Conclusions: Female neck shaft angle was lower than male neck shaft angle. A considerable difference was measured in neck-shaft angle among, male and female viz. Male NSA > Female NSA. However, the NSA findings for bilateral asymmetry showed no statistically significant difference for the sample size studied.

Keywords: Neck-shaft angle, Femur, Angle of inclination, caput-collum-diaphyseal (CCD) angle, Mikulicz angle.

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Corresponding Author

Dr Vineeta Laxmi

MS Anatomy

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