scholarly journals Comparing Two Different Automatic Methods to Measure Femoral Neck-Shaft Angle Based on PointNet++ Network

2021 ◽  
Author(s):  
Zhe Li ◽  
Jiayu Yang ◽  
Xinghua Li ◽  
Kunzheng Wang ◽  
Jungang Han ◽  
...  
Keyword(s):  
Femoral Neck ◽  
Femoral Shaft ◽  
Femoral Neck Axis ◽  
Neck Shaft Angle ◽  
3D Space ◽  
Significant Difference ◽  
Shaft Angle ◽  
Automatic Methods ◽  
3D Methods ◽  
2D And 3D

Abstract Bacnground: Accurate measurement of the femoral neck-shaft angle (NSA) is of great significance for diagnosing hip joint diseases and preoperative planning of total hip arthroplasty. However, the fitting lines of the femoral neck and femoral shaft did not always intersect in 3D space. Thus, it is unclear whether there is a difference between 2D and 3D methods for measuring NSA. Methods: The femoral point cloud datasets from 310 subjects were segmented into three regions, including the femoral head, femoral neck, and femoral shaft using PointNet++. We created a projection plane to simulate the hip anteroposterior radiograph and fitted the femoral neck axis and femoral shaft axis to complete the 2D measurement, while we directly fitted the two axes in space to complete the 3D measurement. Also, we conducted the manual measurement of the NSA. We verified the accuracy of the segmentation and compared the results of the two automatic and manual methods. Results: The Dice coefficient of femoral segmentation reached 0.9746, and MIoU of that was 0.9165. No significant difference was found between any two of the three methods. While comparing the 2D and 3D methods, the average accuracy was 98.00%, and the average error was 2.58°. Conclusion: This paper proposed two accurate and automatic methods to measure the NSA based on a 2D plane and a 3D model respectively. Although the femoral neck and femoral shaft axes did not intersect in 3D space, the NSAs obtained by 2D and 3D methods were basically consistent.

scholarly journals Femoral Neck Shaft Angle in Men with Fragility Fractures

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
S. P. Tuck ◽  
D. J. Rawlings ◽  
A. C. Scane ◽  
I. Pande ◽  
G. D. Summers ◽  
...  
Keyword(s):  
Hip Fracture ◽  
Femoral Neck ◽  
Fracture Risk ◽  
Hip Fractures ◽  
Distal Forearm ◽  
Neck Shaft Angle ◽  
Hip Fracture Risk ◽  
Significant Difference ◽  
Shaft Angle ◽  
Combined Data

Introduction. Femoral neck shaft angle (NSA) has been reported to be an independent predictor of hip fracture risk in men. We aimed to assess the role of NSA in UK men.Methods. The NSA was measured manually from the DXA scan printout in men with hip (62, 31 femoral neck and 31 trochanteric), symptomatic vertebral (91), and distal forearm (67) fractures and 389 age-matched control subjects. Age, height, weight, and BMD (g/cm2: lumbar spine, femoral neck, and total femur) measurements were performed.Results. There was no significant difference in mean NSA between men with femoral neck and trochanteric hip fractures, so all further analyses of hip fractures utilised the combined data. There was no difference in NSA between those with hip fractures and those without (either using the combined data or analysing trochanteric and femoral neck shaft fractures separately), nor between fracture subjects as a whole and controls. Mean NSA was smaller in those with vertebral fractures (129.2°versus 131°:P=0.001), but larger in those with distal forearm fractures (129.8°versus 128.5°:P=0.01).Conclusions. The conflicting results suggest that femoral NSA is not an important determinant of hip fracture risk in UK men.

scholarly journals A COMPARATIVE STUDY OF NECK SHAFT ANGLE OF FEMUR IN CENTRAL INDIAN POPULATION

2021 ◽  
pp. 1-3
Author(s):  
Vivek Kumar ◽  
Vivekanand Murlidhar Gajbhiye
Keyword(s):  
Femoral Neck ◽  
Indian Population ◽  
Femoral Shaft ◽  
Mean Value ◽  
Developmental Dysplasia ◽  
Neck Shaft Angle ◽  
Geographical Variations ◽  
Shaft Angle ◽  
The Mean ◽  
The Right

Background: In the fields of forensics, anthropology, orthopaedics, and human kinematics, the thigh bone femur is widely studied. The clinical significance of the femoral neck shaft angle lies in the diagnosis, treatment and monitoring of femoral neck fractures, trochanteric fractures, slipped upper femoral epiphysis, and hip developmental dysplasia. Objective: The present study was conducted to compare the NSA disparity between femurs on both sides and to compare the NSA with the Western and Indian population sizes of different regions. This research therefore leads to Indian data on these parameters. Materials and Methods: A total of 150 (75 right and 75 left) dry femur were used for measuring the neck shaft angle. Unpaired t-test was used to compare right and left femora. Results: The mean value of neck shaft angle was 126.04±5.05°. It ranges between 1130 to 1360. The mean value of right side was 125.92±4.9° and left side was measured 127.43±5.2°. There was no significant correlation between right and left neck shaft angle. Conclusion: The mean left femoral neck shaft angle was higher than the right femoral shaft in the present analysis, but the values were not statistically important. The angle of the neck shaft was lower than most studies in the Western population, but it was similar to most other studies in India. In the Indian population, geographical variations in the angle of the neck shaft also occur. In the field of orthopaedic surgery and anthropometry, this research will be of benefit.

Radiographic Assessment of the Proximal Femoral Anatomy in An Indigenous African Adult Population

2021 ◽  
Vol 9 (3.1) ◽  
pp. 8034-8039
Keyword(s):  
Femoral Neck ◽  
Proximal Femur ◽  
Adult Population ◽  
Femoral Offset ◽  
Femoral Neck Axis ◽  
Neck Shaft Angle ◽  
Shaft Angle ◽  
The Mean ◽  
Axis Length ◽  
Neck Diameter

Background: Hip surgeries such as fracture fixation, corrective osteotomy, hemiarthroplasty, or total hip arthroplasty require accurate preoperative templating for a successful outcome. Such templating is done using the proximal femur and the acetabulum radiographs, depending on the planned surgery. Understanding the normal radiographic anatomy of the proximal femur is crucial to differentiate a normal from pathological anatomy. Proximal femoral anatomic indices include the femoral head diameter, femoral neck diameter, femoral neck length, femoral offset, femoral neck axis length and the femoral neck-shaft angle. Aim: This study assesses and establishes the average values of the proximal femoral anatomy in an indigenous African adult population. Method: This cross-sectional study examined 190 normal anteroposterior (AP) radiographs of the pelvis. The mean age, weight and height of the subjects were obtained. The following proximal femoral anatomic parameters were measured: femoral neck length (FNL), femoral neck diameter (FND), femoral head diameter (FHD), femoral neck-shaft angle (FNSA), femoral offset (FO) and femoral neck axis length (FNAL). The authors compared the mean difference of the parameters between the genders and the age categories and assessed the parameter correlations with the patients’ weight and height. Results: Males constituted 63 (33.2%) of the study population. The mean age of the subjects was 51.46 years (SD = 16.37). The mean weight was 76.13 kg, while the mean height was 1.62 m. The mean values of the proximal femoral parameters were as follows: FNL 4.52cm, FND 3.42cm, FHD 4.76cm, FNSA 132.960, FO 4.09cm, and FNAL 10.34cm. Males have a significantly higher mean value in all the parameters except the FO. None of the parameters showed any significant difference among the age categories except the FNL. A post-hoc analysis showed that the difference in the FNL lies between the young and the elderly age groups. The subjects’ height correlated with all the parameters except FNSA, while the weight correlated with the FND, FNSA and FNAL. Conclusion: The proximal femoral anatomy in Africans differed from those published in foreign literature. This knowledge is crucial for implant manufacturing companies and preoperative templating for hip surgeries. KEY WORDS: Proximal femur, Anatomy, Black population.

The association between femoral neck shaft angle and degenerative disease of the hip in a cadaveric model

2021 ◽  
pp. 112070002110130
Author(s):  
Leigh-Anne Tu ◽  
Douglas S Weinberg ◽  
Raymond W Liu
Keyword(s):  
Femoral Head ◽  
Femoral Neck ◽  
Hip Osteoarthritis ◽  
Volume Ratio ◽  
Femoral Head Coverage ◽  
Neck Shaft Angle ◽  
Hip Arthritis ◽  
Femoral Version ◽  
Shaft Angle ◽  
The Impact

Background: While the influences of acetabular dysplasia and overcoverage on hip arthritis have been studied, the impact of femoral neck-shaft angle on hip arthritis is much more poorly understood. The purpose of this study is to determine if a relationship exists between neck shaft angle and the development of osteoarthritis, a better understanding of which would be useful to surgeons planning osteotomies about the hip. Methods: 533 cadaveric femora and acetabulae (1066 total) from the Hamann-Todd Osteological Collection (Cleveland, OH) were acquired. We measured true neck shaft angle using an AP photograph with the femoral neck parallel to the table. Femoral head volume to acetabular volume ratio, representing femoral head coverage, as well as femoral version were utilised. Correlation between neck shaft angle, femoral version, femoral head coverage and osteoarthritis were evaluated with multiple regression analysis. Results: The mean age and standard deviation was 56 ± 10 years. There were 64 females (12%) and 469 males. There were 380 Caucasians (71%) and 153 African-Americans. Mean femoral version was 11° ± 12° and mean true neck shaft angle was 127.7° ± 5.9° There was a strong correlation between age and arthritis (standardised beta 0.488, p < 0.001). There was a significant correlation between increasing true neck shaft angle and decreasing hip arthritis (standardised beta -0.024, p = 0.038). In the femoral head overcoverage subset, increasing true neck shaft angle was still significantly associated with decreasing hip arthritis (standardised beta −0.088, p = 0.018), although this relationship was not significant with femoral head undercoverage subset. Conclusions: With sufficient acetabular coverage, a relative increase in femoral neck shaft angle within the physiologic range is associated with decreased hip osteoarthritis. Clinical relevance: An understanding of the relationship between femoral neck shaft angle and hip osteoarthritis could be useful for surgeons planning pelvic or proximal femur osteotomies in children.

scholarly journals Simultaneous Morscher’s osteotomy and arthroscopic debridement in the management of Legg–Calvé–Perthes disease: a case report and literature review

2021 ◽  
Vol 8 (Supplement_1) ◽  
pp. i4-i8
Author(s):  
Batool Bosakhar ◽  
Hassan Baldawi ◽  
Kathy Liu ◽  
Olufemi R Ayeni ◽  
Waleed Kishta
Keyword(s):  
Case Report ◽  
Literature Review ◽  
Femoral Neck ◽  
Perthes Disease ◽  
Labral Repair ◽  
Coxa Vara ◽  
Neck Shaft Angle ◽  
Shaft Angle ◽  
Outcome Tool

Abstract There is a lack of consensus around optimal surgical management for Legg–Calvé–Perthes Disease (LCPD). This case report discusses the benefits of combining arthroscopic femoral neck osteochondroplasty and labral repair with Morscher’s Osteotomy (MO) for LCPD. S.A. is a 17-year-old female diagnosed with LCPD at the age of 6 years and has long-standing right hip symptoms. An arthroscopic femoral neck osteochondroplasty and labral repair followed by MO was performed. The pre-operative and 8 months post-operative International Hip Outcome Tool (iHOT-12) scores were 16.3 and 79.8 out of 100, respectively, indicating better quality-of-life. Also, the femoral neck-shaft-angle (NSA) changed from 120 pre-operative to 138.7 post-operative to represent the correction of coxa vara. The literature review revealed no published reports describing combined MO with hip arthroscopic interventions in managing LCPD. Combined arthroscopic femoral neck osteochondroplasty (with labral repair) and MO provides high patient satisfaction and improves radiographic parameters in patients with LCPD.

scholarly journals Sexual Variations of Femoral Neck-Shaft Angle in the Population of Odisha

2021 ◽  
Vol 10 (19) ◽  
pp. 1387-1390
Author(s):  
Rajeev Kumar Kanchan ◽  
Sonali Subhadarsini ◽  
Dharma Niranjan Mishra ◽  
Chinmayi Mohapatra
Keyword(s):  
Femoral Neck ◽  
Ventral Surface ◽  
Cross Sectional Study ◽  
Cross Sectional ◽  
Legal Cases ◽  
Male And Female ◽  
Neck Shaft Angle ◽  
Femur Neck ◽  
Shaft Angle ◽  
The Right

BACKGROUND The peculiar waddling gait of a female attracts most of the anatomists to measure and compare the neck-shaft angle (NSA) of the femora. The femoral neck shaft angle is greater in women due to greater pelvic breadth and shorter femur. Neck-shaft angle was measured by the angle that the neck makes with the shaft of the femur and it is measured on the ventral surface of femur taking the long axis of femoral neck with the long axis of the proximal end of the femur. It gives information about the race it belongs to and normally measures 120° to 140°. The intention of this study was to establish the femoral neck shaft angle variations in adult male and female for medico-legal and anthropometric studies. METHODS This cross-sectional study was conducted on 84 adult human femora of unknown sex in the anatomy department, Sriram Chandra Bhanja (SCB) Medical College, Cuttack, Odisha, from May 2018 to April 2019. We included all the femora which were free of damage or deformity and fully ossified indicating adult bone. Femora with any pathological changes i.e., cortical bone deterioration, extreme osteophyte activity, osteoarthritis and fracture etc. were excluded from the study. The NSA was measured by protractor and goniometer. RESULTS In the present study the NSA range for the right femur of male was 108° - 135° and for the right femur of females 117° - 135°. The left male femur was 118° - 135° and the left female femur was 120° - 135°. The mean neck shaft angle of male femora was 125.9° and the female femora was 125.7°. These measurements show that the values were more in males than the females. The value of the present study was statistically significant between male and female i.e., P < 0.0001. CONCLUSIONS These measurements are important in the medico-legal cases, reconstructive orthopaedic surgeries, hip replacement surgeries and also while constructing suitable prosthesis. This will also be helpful in the detection of sex by anatomists and forensic experts. KEY WORDS Neck Shaft Angle, Medico-Legal, Anthropometry and Goniometer

Morphometric Study of Femoral Neck-Shaft Angle in Kolar Population and Its Clinical Importance

2019 ◽  
Vol 8 (3) ◽  
pp. 226-232
Author(s):  
Suresh NM ◽  
◽  
Sunitha R ◽  
Aruna N ◽  
Nalini JP ◽  
...  
Keyword(s):  
Femoral Neck ◽  
Clinical Importance ◽  
Morphometric Study ◽  
Neck Shaft Angle ◽  
Shaft Angle

scholarly journals Analysis of Proximal Femoral Parameters in Adolescent Idiopathic Scoliosis

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Máté Burkus ◽  
Ádám T. Schlégl ◽  
Kristóf József ◽  
Ian O’Sullivan ◽  
István Márkus ◽  
...  
Keyword(s):  
Adolescent Idiopathic Scoliosis ◽  
Idiopathic Scoliosis ◽  
Mechanical Axis ◽  
Three Dimensional ◽  
Femoral Shaft ◽  
Neck Shaft Angle ◽  
Shaft Angle ◽  
Spinal Abnormality ◽  
Lower Neck ◽  
Femoral Mechanical Axis

Background. Assessment of the proximal femoral parameters in adolescent idiopathic scoliosis using three-dimensional radiological image reconstructions may allow better characterization than conventional techniques. Methods. EOS 3D reconstructions of spines and femurs of 320 scoliotic patients (10-18 years old) and 350 control children lacking spinal abnormality were performed and 6 proximal femoral parameters measured. Results. Individuals with adolescent idiopathic scoliosis showed a small but statistically significant decrease in neck shaft angle (average difference=2.58°) and a higher (0.22°) femoral mechanical axis–femoral shaft angle. When the two sides were compared based on curve direction, greater changes in the neck shaft angle and femoral mechanical axis–femoral shaft angle were found on the side of the convexity. Conclusions. Patients with adolescent idiopathic scoliosis were found to have a small but significantly lower neck shaft angle and higher femoral mechanical axis–femoral shaft angle, which related to the curve direction. This is postulated to be due to mechanical compensation for altered balance and centre of gravity associated with a scoliosis deformity, although the observed difference likely has negligible clinical effect.

The Association Between Femoral Neck-Shaft Angle and Aging and Its Influence on the Performance of Functional Activity: A Cross-Sectional Investigation

2020 ◽  
Vol 28 (2) ◽  
pp. 250-254
Author(s):  
Ibrahim M. Altubasi
Keyword(s):  
Femoral Neck ◽  
Regression Models ◽  
Walking Speed ◽  
Functional Performance ◽  
Hierarchical Regression ◽  
Performance Tests ◽  
Cross Sectional ◽  
Neck Shaft Angle ◽  
Functional Activities ◽  
Shaft Angle

The purposes of this study were first to examine the association between aging and both the magnitude and asymmetry in the femoral neck-shaft angle (NSA). The second purpose was to determine the effects of both the magnitude and NSA asymmetry on the performance of functional activities in healthy individuals. Fifty-one subjects participated in this study. The femoral NSA was measured on computed tomography scout images. The participants performed four performance tests. Four hierarchical regression models were constructed to explore the effect of each predictor on the outcomes. Aging was associated with NSA asymmetry, but not with the degree of NSA. Age contributed significantly to the variability of all functional performance tests except the 10-m walking speed. The degree of the NSA did not contribute to the prediction of the functional performance tests. However, asymmetry in the NSA added significantly to the prediction of all functional performance tests except the 10-m walking speed.

scholarly journals Femoral neck-shaft angle in humans: variation relating to climate, clothing, lifestyle, sex, age and side

2013 ◽  
Vol 223 (2) ◽  
pp. 133-151 ◽  
Author(s):  
Ian Gilligan ◽  
Supichya Chandraphak ◽  
Pasuk Mahakkanukrauh
Keyword(s):  
Femoral Neck ◽  
Neck Shaft Angle ◽  
Shaft Angle
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