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The femur is the longest and strongest bone in the human body. It is about 45 cm in length in an average man. The femoral neck-shaft angle (NSA) is very important in the diagnosis and treatment of many pathological conditions relating to the femur and hip joint. Our study aims to evaluate the values of femoral NSA and detect the relationship between this angle and age in the Sohag population. 3-Patients & Methods CT scans of 300 patients (40. 90 years, range of 18 -60 years; 150 females). CT scans were reformatted to three-dimensional pelvic models (3D) simulating standardized radiographic views of anteroposterior roentgenograms of the pelvis in the anterior pelvic plane (APP). NSA values were 129.45° (range 116.1°-146.7°; SD 4.88°) for patients aged from 18y to 39y & 129.48° (range 115.7°-145.9°; SD 5.25°) for patients aged from 40y to 60y. There was no statistically significant difference regarding NSA & age as p-value = .785 (p-value > .05). Correlation analysis revealed no significant relationship between NSA and age. Keywords Proximal femur 1, Neck-shaft angle (NSA) 2, Computerized Tomography (CT) 3, Morphometry 4, Age 5 IntroductionThe femur, or thigh bone, is the strongest and longest bone in the body, measuring about 45 cm in length in an ordinary man, or almost one-fourth of their height. It has a cylindrical shaft with an upper and lower end. The head, neck, greater and lesser trochanters, inter-trochanteric line, and inter-trochanteric crest make up the upper end. The neck is about 5 cm long, connects the head to the shaft, and is pointed upward, medially, and slightly forward, forming a 125-degree angle with the femur shaft in adults, but higher in children. The expanded neck-shaft angle allows for a wide range of hip joint movement, allowing the limb to swing freely (Sinha et al., 2017). The angle produced by the neck axis and the long axis of the femur shaft is known as the neck-shaft angle (NSA). It's also known as the femur neck angle, inclination angle, collodiaphyseal angle, cervicodiaphyscal angle (Anderson and Trinkaus, 1998) caput-collum-diaphyseal angle (CCD) (Shrestha et al., 2018), and Mikulicz angle (Sinha et al., 2017). The normal neck-shaft angle ranges from 115 to 140 degrees (with a mean of 126 degrees) (Shrestha et al., 2018). Men had a mean neck-shaft angle of 130.3 degrees, ranging from 121 to 138 degrees, whereas women had a lesser Article info. Citation: Bushra M., Galal A., Ouies S., & Mohamad M. (2022). Femoral neck-shaft angle in Sohag population and its variation relating to age.

Background Accurate measurement of the femoral neck shaft angle (NSA) is critical for the diagnosis and treatment of hip pathology, but its current reference values remain limited in the Egyptian adult population. This study was designed to provide reference that is reliable for femoral NSA measured by computed tomography (CT) in Egyptian healthy adults of both sexes. This was a cross-sectional descriptive study and analysis of the femoral NSA of healthy Egyptian adults of both sexes measured by CT. Six hundred hips in 300 adults (aged 18 and 60 years; 300 females) were evaluated in the simulated anterior pelvic plane (APP) and the rotation-corrected coronal reconstruction femoral neck plane (FNP) on both sides. We compared the measurements with age and sex, and a two-tailed nonparametric Wilcoxon test was used to discover differences between both measurements. Results The mean NSA was 129.46° ± 5.06°, with a mean value of 129.65° ± 4.13° for males and 129.28° ± 3.71° for females. Simulated APP had a higher mean NSA 129.6° (range 115.7°–146.7°; SD 5.06°) than rotation-corrected coronal reconstruction in the FNP 127.73° (range 115.3°–144.6°; SD 4.9°). It was observed that there was a significant variation in the measurements of NSA between the two methods. The side influenced the NSA significantly on both views (p < 0.001); no significant differences were found between age and gender. Conclusions The current study attempts to develop population-specific data for femoral NSA reference values in Egyptian communities. No considerable difference was measured in NSA among males and females. It was observed that there was a side difference, with the NSA value being higher on the left than the right. We noted also that proper measurement of NSA is made possible by using NSA values obtained from rotation-corrected coronal reconstruction in the FNP. We anticipate that the findings will contribute to a better understanding of proximal femur morphology and may aid the majority of our population in selecting an implant that is compatible with hip anatomy.

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