Evaluation of neck shaft angle and ante version in dry femorae of adult Indian population

Manikandan, T (2015) Evaluation of neck shaft angle and ante version in dry femorae of adult Indian population. Masters thesis, Madras Medical College, Chennai.

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Abstract

INTRODUCTION : The proximal end of the femur has been the object of much attention. Knowledge of its anatomy is a prerequisite for a complete understanding of the mechanics of the hip joint and serves as a basis for the treatment of pathological conditions of the hip and femur. Extensive studies of normal neck angles have been carried out. The values differ considerably in the reports available. Differences in methods used, differing anatomical definitions and variations between populations may account for this. AIM : To evaluate the possible variation in the measurements of neck shaft angle and ante version by Direct ,X-ray and CT –guided values in dry femorae of adult Indian population. This correlation of measurements will help us to identify a simple, reliable radiological method to evaluate the proximal femoral angles and the data obtained in this study will help us to improve the implant and prosthesis design for Indian population and enhance the functional outcome of the patient. Study type: analytical observational study – cross sectional type. MATERIALS AND METHODS: 50 unpaired adult dry femorae of undetermined age and sex without gross pathology and abnormality from anatomy department, MMC will be used as the study material. Immature bones, bones with abnormal pathology were excluded from the study. ANTEVERSION: Direct measurements by Kingsley Olmsted method X-ray measurements were taken in dry femur by the method described by KOSUKE OGATA et al- Biplanar radiography method-from AP view and Lateral view of dry femur. CT –measurements of anteversion were taken by measuring the angle between neck horizontal axis and condylar horizontal axis in dry femur scannogram. NECK –SHAFT ANGLE: The collo diaphyseal angle between the head neck axis and the femoral shaft axis measured by direct, X-rays and CT methods. RESULTS: The mean anteversion angle by Direct, X-ray and CT measurements was found to be 10.3⁰, 10.4⁰, 9.9⁰ respectively. Among the three methods the CT-guided method seems to be more accurate to measure the ante version angle by Friedman test result. There was no significant difference in which side (right/left) the sample bone belongs to. The mean neck shaft angle by Direct, X-ray and CT measurements was found to be 131.9± 5.3, 130.3±4, 133.9±5 respectively. Among the three methods the X-ray method seems to be more accurate to measure the neck shaft angle by Friedman test result. There was no significant difference between right and left side bones. CONCLUSION: 1. The simple biplanar radiography can be substituted as an alternative for CT measurements to determine the NSA and AV preoperatively, though CT – measurements give more accurate values. 2. The data obtained forms a strong base for future research in proximal femoral angles in adult Indian population. 3. The proximal femur angles varies for each person even in Indian population and the implants designed are mainly based on the data obtained from western population. These radiological methods helps us to obtain pre operative proximal femur angles to design specific implants to improve the efficiency of fracture fixation and functional outcome.

Item Type: Thesis (Masters)
Uncontrolled Keywords: neck shaft angle ; ante version ; dry femorae ; adult ; Indian population.
Subjects: MEDICAL > Orthopaedics
Depositing User: Subramani R
Date Deposited: 25 Sep 2017 01:00
Last Modified: 25 Sep 2017 01:00
URI: http://repository-tnmgrmu.ac.in/id/eprint/3285

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