الفهرس 
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Abstract
The proximal femur’s shape has been studied extensively, and it carries an important anatomical landmark known as the Neck-shaft angle (NSA).
The use of NSA in assessing the biomechanics of the hip joint and orthopedics for the planning of procedures is critical.
The current study was a cross-sectional descriptive study analysis of NSA in hips in 300 normal Sohag healthy adults (≥18 & ≤ 60 years).
Four groups were generated: (1) males 18-39 years, (2) females 18-39 years, (3)
male 40-60 years, (4) female 40-60 years.
For each group, available cases were screened and tested for inclusion/exclusion criteria until 75 CT scans were included per group. Each hip (n = 600) was analyzed separately.
We used Computed Tomography (CT) in the determination and measurement of femoral neck-shaft angle through an Antero- Posterior Scanogram of pelvis and thigh
CT scans were represented in another format to three-dimensional pelvic models mimicking standardized radiographic views of an anteroposterior roentgenogram of the pelvis in the anterior pelvic plane (APP) Furthermore, coronal reconstructions of each proximal femur in the plane of the femoral neck (FNP), overriding femoral neck torsion, hip rotation, and flexion were acquired, Then use Müller method to measure femur neck- shaft angle.
Thereby, the following findings were observed :
CT-based NSA(APP) values were 129.65° +/-5.22° for adult men and 129.28°+/-
4.91 ° for adult women.& CT-based NSA(FNP) values were 127.98° +/-5.07° for adult men and 127.48°+/- 4.78 ° for adult women. NSA was smaller in females than males but there was no statistically significant difference between males& females regarding NSA as p-value >.05, SO our study confirms that no separate gender implants must be designed for the opposite gender.
CT-based NSA(APP) values was 127.43° +/-4.53° for RT side and 131.49° +/-
4.75 ° for LT side.& CT-based NSA(FNP) values was 125.38° +/- 4.11° for RT side and 130.09°+/- 4.53 ° for LT side. There was high statistically significant difference beween RT & LT side as p-value = .000 ( LT side is > RT side) .SO our study confirms that RT implants must be different from LT implants .
NSA(APP) values was 129.84° +/-4.98° for adult men (18-39 y) & 129.06°+/-
4.77 ° for adult women(18-39 y) & 129.41° +/-5.46° for adult men (40-60 y) & 129.54°+/- 5.05 ° for adult women(40-60 y) .
NSA(FNP) values was 128.03° +/-5.11° for adult men (18-39 y) & 127.45°+/-
4.76 ° for adult women(18-39 y) & 127.87° +/-5.03° for adult men (40-60 y) & 127.57°+/- 4.82 ° for adult women(40-60 y).
NSA(APP) values were 129.45° +/-4.88° for patients aged from 18y to 39y &
129.48° +/-.785° for patients aged from 40y to 60y.
NSA(FNP) values were 127.74° +/-4.94° for patients aged from 18y to 39y &
127.72° +/-.4.92° for patients aged from 40y to 60y. There was no statistically significant difference regarding NSA & age as p-value >.05. Correlation analysis revealed no significant relationship between NSA and age
The current study also showed that the NSA values of the study population in two
views (APP& FNP ) showed high significant difference (p = .000). Higher mean NSA values in the simulated anteroposterior roentgenograms of the pelvis (APP)( 129.46 ) when compared to the coronal reconstructions (FNP) (127.73).
Conclusion
Based on the outcome of the present study, it can be concluded that Regarding NSA :
There was no difference between male& female
There was a difference between RT & LT side ( LT side is > RT side)
Correlation analysis revealed no significant relationship between NSA and age
As anteroposterior pelvis radiographs were susceptible to rotational errors,
derotated coronal reconstructions of the proximal femur in the neck plane allow the correct measurement of the NSA
Recommendation:
• Further studies are suggested for the measurement of NSA angle in a wide range of the population.
• Further studies can be done using MRI in measure of NSA.