Validity and reliability of different techniques of neck–shaft angle measurement

Bizdikian, Aren Joe; Assi, Ayman; Bakouny, Ziad; Yared, Fares; Saghbini, Elie; Bakhos, Gerard; Esber, Sabine; Khalil, Nour; Otayek, Joeffroy; Ghanimeh, Joe; Sauret, Christophe; Skalli, W.; Ghanem, Ismat

doi:10.1016/j.crad.2018.06.006

Cited by 9 publications

(13 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, measurements by 1 reader do not allow for intraclass correlation coefficients to assess interobserver and intraobserver reliability; however, the reliability of MP (0.95), NSA (0.92 to 0.96), and AI (0.84) have been established and are excellent when taught properly. 7,14,15 For this reason, an instructional session before data collection was done to assess proper, literature-based collection of measurements and aid in alleviating as much reader bias as possible. Multiple audits were done by other authors to ensure consistency and agreement of measurements throughout the study.…”

Section: Discussionmentioning

confidence: 99%

Failure of Hip Reconstruction in Children With Cerebral Palsy: What Are the Risk Factors?

Minaie¹,

Gordon

Schoenecker

et al. 2021

Journal of Pediatric Orthopaedics

View full text Add to dashboard Cite

Background:The rates and risk factors contributing to failure after hip reconstruction among patients with cerebral palsy (CP) are not well established. In analyzing a large cohort of children with CP who underwent hip reconstruction, the objectives of this study are to establish (1) the failure rates and (2) associated risk factors. Methods: This retrospective study included chart and radiographic review of patients between the ages of 1 to 18, with a diagnosis of CP, who underwent a hip reconstructive procedure at a single children's hospital over a 9-year period (2010 to 2018). Patients without at least 2 years of follow-up were excluded. Age at time of surgery, sex, Gross Motor Function Classification System (GMFCS), procedure(s) performed, preoperative migration percentage (MP), neck-shaft angle, and acetabular index (AI) were recorded. Failure was defined as need for revision surgery or a MP > 50% on follow-up radiographs. Logistic regression and multiple-variable regression-type models were used to test for significance of risk factors. Results: Of the 291 hips in 179 patients (102 males, 77 females) that met inclusion criteria, 38 hips (13%) failed. Significant differences in the failure group were seen in age at time of surgery (6.2 ± 3.2 vs. 8.1 ± 3.2; P < 0.001), preoperative MP (62.3 ± 28.7 vs. 39.9 ± 24.1%; P < 0.001) and preoperative neck-shaft angle (164.9 ± 8.2 vs. 157.3 ± 15.6 degrees; P < 0.001). Age below 6 at time of surgery significantly increased failure rate (26% vs. 6.3%, P < 0.001) as did preoperative MP > 70% (28.9% vs. 9.9%, P < 0.001). Receiving an acetabular osteotomy was protective against failure (9.1% vs. 16.9%, P = 0.048), particularly in patients with a preoperative AI > 25°(odds ratio = 0.236; confidence interval: 0.090-0.549). Conclusions: In this case series, failure after hip reconstruction for children with CP was determined to be 13.1%. There was a higher risk associated with age under 6 at time of surgery or a preoperative MP > 70%. Correction of acetabular dysplasia when AI is more than 25 degrees with acetabular osteotomy at time of hip reconstruction, exerted a protective effect against subsequent failure.

show abstract

Section: Discussionmentioning

confidence: 99%

Failure of Hip Reconstruction in Children With Cerebral Palsy: What Are the Risk Factors?

Minaie¹,

Gordon

Schoenecker

et al. 2021

Journal of Pediatric Orthopaedics

View full text Add to dashboard Cite

show abstract

“…The femoral neck axis (FNA) can be defined as the line between the center of the femoral head and the femoral neck; however, their exact definition varies in the literature. The femoral shaft axis (FSA) can also differ pending on the part of the femur considered 1 , 2 . Boese et al 3 suggested to use a modified FNA, the line between the center of femoral head and the horizontal tangent of the FSA in the level of the lesser trochanter’s apex.…”

Section: Introductionmentioning

confidence: 99%

“…In the reviewed international literature, only Bizdikian et al examined the accuracy of the 2D-based NSA measurement methods and the effect of the positional error in a younger population. In their 3D CT reconstruction-based study, they enrolled 9 adults and 8 adolescents (9–15 years old) and found the circle-fitting method as the most accurate 2 .…”

Section: Introductionmentioning

confidence: 99%

Neck-shaft angle measurement in children: accuracy of the conventional radiography-based (2D) methods compared to 3D reconstructions

Schlégl

Nyakas

Kovács

et al. 2022

Sci Rep

View full text Add to dashboard Cite

Aim of this study was to examine the accuracy of widely used conventional radiography-based (2D) neck-shaft angle measurements compared to 3D reconstruction. In our retrospective study, EOS 2D/3D images of 156 patients (312 limbs) were selected from our database (4–16 years old: 6 girls and 6 boys/year), where no pathology was revealed. Using the 2D modality of the EOS method neck-shaft angle was measured using the “biggest diameter” and “circle fitting” techniques to define the femoral neck axis and 1/3, 1/2 and full femur to determine the femoral shaft axis. EOS 3D reconstructions of same images were also performed and a comparison of 2D and 3D results was made. We did not find any significant difference between accuracy of the four examined 2D methods, although the deviation between 2 and 3D results was considerable (average difference: 5.11–5.58°, p < 0,001). In 31% of the cases, difference was more than 10°. Only femoral torsion showed significant influence on the difference (correlation coefficient: 0.380, p < 0.001). We did not find a clinically significant difference between the examined 2D methods, although their accuracy was highly questionable compared to 3D results. We suggest using any 3D imaging method for surgical planning and in uncertain cases.

show abstract

“…One of the anthropometry concepts that requires attention during the prosthesis design is the caput collum diaphysis angle. The caput collum diaphysis angle is utilized in pre‐surgical planning of the proximal femur [7]. It is the angle between the neck and the stem of the hip prosthesis and is directly associated with other hip parameters such as femoral head offset and femoral neck length [8].…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis of newly developed hip prosthesis

Namasivayam

Andriyana

Arifin

2022

Materialwissenschaft Werkst

View full text Add to dashboard Cite

The present study focuses on the design and finite element analysis of a novel hip prosthesis comprising truss structures intended to equally distribute the stress along the prosthesis. The prosthesis is designed to suit three different inclination angles of 20°, 40° and 60°. The three designs were subjected to loading conditions that emulate walking, jogging, and cycling activities via finite element simulations. Using the von Mises yield criterion and Goodman relation for fatigue, it is found that the safety factor and the life cycle of the proposed prosthesis design was within the acceptable range. Furthermore, the truss structures incorporated in the prosthesis appear to reduce the stress levels in the femur.

show abstract

Validity and reliability of different techniques of neck–shaft angle measurement

Abstract: Method 1, based on locating the CFH, was the most reliable and valid method and should be considered as a standardised two-dimensional NSA measurement method for clinical application.

Cited by 9 publications

References 33 publications

Failure of Hip Reconstruction in Children With Cerebral Palsy: What Are the Risk Factors?

Failure of Hip Reconstruction in Children With Cerebral Palsy: What Are the Risk Factors?

Neck-shaft angle measurement in children: accuracy of the conventional radiography-based (2D) methods compared to 3D reconstructions

Finite element analysis of newly developed hip prosthesis

Contact Info

Product

Resources

About