The neck shaft angle: CT reference values of 800 adult hips

Boese, Christoph Kolja; Jostmeier, Janine; Oppermann, Johannes; Dargel, Jens; Chang, De‐Hua; Eysel, Peer; Lechler, Philipp

doi:10.1007/s00256-015-2314-2

Cited by 51 publications

(53 citation statements)

References 17 publications

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“…Of note, historical specimens showed significant differences compared to current populations [1, 19]. Third, the NSA is highly dependent from hip rotation and the projected NSA can differ significantly from the true (maximum) NSA (Figure 1) [7, 8, 15]. Even the application of highly standardized radiographs does not completely eliminate this effect [9].…”

Section: Discussionmentioning

confidence: 99%

“…A previously described cohort of 400 patients undergoing whole-body trauma computed tomography scans was retrospectively included [15]. All CT scans were screened for inclusion and exclusion criteria.…”

Section: Methodsmentioning

confidence: 99%

“…Patients were stratified for further analysis into four groups consisting of 100 scans (200 hips) each: (A) male under 60 years of age, (B) male over 59 years of age, (C) female under 60 years of age, and (D) female over 59 years of age. A detailed description of the cohort has been published previously [15, 16]. …”

Section: Methodsmentioning

confidence: 99%

“…Finally, a coronal reconstruction of each proximal femur in the plane of the femoral neck (FNP) was created, which eliminated rotational influences. All measurements followed a standardized protocol [15, 16]. The detailed methods of the reconstruction of the APP and FNP were described previously [15, 16].…”

Section: Methodsmentioning

confidence: 99%

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The Modified Femoral Neck-Shaft Angle: Age- and Sex-Dependent Reference Values and Reliability Analysis

Boese

Frink

Jostmeier

et al. 2016

BioMed Research International

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Background. The femoral neck-shaft angle (NSA) is of high importance for the diagnostics and treatment of various conditions of the hip. However, rotational effects limit its precision and applicability using plain radiographs. This study introduces a novel method to measure the femoral NSA: the modified NSA (mNSA), possibly being less susceptible against rotational effects compared to the conventional NSA. Patients and Methods. The method of measurement is described and its applicability was tested in 400 pelvis computed tomography scans (800 hips). Age- and gender-dependent reference values are given and intra- and interrater reliability are analyzed. Results. The mean age of all 400 patients (800 hips) was 54.32 years (18–100, SD 22.05 years). The mean mNSA was 147.0° and the 95% confidence interval was 146.7°–147.4°. Differences of the mNSA between sexes, age groups, and sides were nonsignificant. The absolute difference between NSA and mNSA was 16.3° (range 3–31°; SD 4.4°); the correlation was high (0.738; p < 0.001). Overall, the intra- and interrater reliability were excellent for the mNSA. Interpretation. We introduced a novel concept for the analysis of the neck-shaft angle. The high reliability of the measurement has been proven and its robustness to hip rotation was demonstrated.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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The Modified Femoral Neck-Shaft Angle: Age- and Sex-Dependent Reference Values and Reliability Analysis

Boese

Frink

Jostmeier

et al. 2016

BioMed Research International

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“…It ranges from 15 ᵒ -45 ᵒ [3]. he FNA has to be taken into consideration when reduction and ixation is selected as a method of treatment [4]. Abnormal FNA sometimes can be associated with many clinical problems ranging from harmless intoeing gait in the early childhood to osteoarthritis of the hip and knee in adult [4].…”

Section: Introductionmentioning

confidence: 99%

The Proximal Femur in Egyptian (Morphometric and Radiological Study)

Zaki¹,

Shona²,

Sayed³

et al. 2017

Anat Physiol

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Introduction: Knowledge about the different diameters of the head and neck of femur is essential in orthopedic surgery for prosthesis and nail application. The aim of this study was to evaluate the average FNA in the young Egyptians and the effect of age on it. Also, matching sex and side differences of the angle were done by using CT. In addition, the different growth parameters of the proximal femur were measured by using plain X-ray. Side, sex differences and correlation analysis between these parameters were also done.

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Variations in pelvic dimensions: An anatomical and computed tomography study

et al. 2018

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The anterior pelvic plane (APP) is a useful anatomical reference with both clinical and research applications in orthopedic surgery and rehabilitation medicine. It is used as a marker for computer-assisted total hip replacement and image-guided assessment of the hip center in clinical gait analysis. Despite its common use, no published data exist on the variations in height and width in an adult population. The aim of this study was to determine the range of dimensions for the anterior pelvic plane found in the Scottish adult population. Thirty-five human cadavers and 100 pelvic computed tomography (CT) scans were examined. Pelvic height and width were measured, and the ratios were determined. The mean width and height for combined cadaver and CT pelves were found to be 238.0 mm (SD 20.1, range 188.3-273.8) and 92.7 mm (SD 10.5, range 71.2-114.7), respectively. The mean width-to-height ratio for all pelves was 2.59 (SD 0.31, range 1.73-3.50). There were no statistically significant differences in means between males and females. The variations of APP dimensions within an adult population are presented. These will be of value in the validation of algorithms for computer navigation and hip joint center calculation in total hip arthroplasty and gait analysis. Furthermore, differences in dimensions between cadaveric and CT measurements have been shown which may have implications for further research and the validity of reference data dependent on data-point acquisition. Clin. Anat. 31:981-987, 2018. © 2018 Wiley Periodicals, Inc.

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The neck shaft angle: CT reference values of 800 adult hips

Abstract: While anteroposterior pelvis radiographs are susceptible to rotational errors, the coronal reconstruction of the proximal femur in the femoral neck plane allows the correct measurement of the NSA.

Cited by 51 publications

References 17 publications

The Modified Femoral Neck-Shaft Angle: Age- and Sex-Dependent Reference Values and Reliability Analysis

The Modified Femoral Neck-Shaft Angle: Age- and Sex-Dependent Reference Values and Reliability Analysis

The Proximal Femur in Egyptian (Morphometric and Radiological Study)

Variations in pelvic dimensions: An anatomical and computed tomography study

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