Axial Oblique CT to Assess Femoral Anteversion

Jarrett, Delma Y.; Oliveira, Amy; Zou, Kelly H.; Snyder, Brian D.; Kleinman, Paul K.

doi:10.2214/ajr.09.3702

Cited by 65 publications

(84 citation statements)

References 9 publications

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“…A tangent line is drawn between the posterior peaks of the femoral condyles. [ 2 , 3 , 7 , 12 ] Previous research has shown that this method provides the best reproducibility. [ 9 ] This method was not modified, in order to ensure comparability with previously published data.…”

Section: Methodsmentioning

confidence: 99%

“…Researchers have described femoral anatomy in cadavers [ 5 , 7 , 10 , 12 ] and have used techniques including plain radiography [ 1 , 5 , 11 ], computed tomography [ 7 , 9 ], 3D-reconstructed computed tomography [ 14 ] and MRI [ 21 ]. Although extensive research has been performed, results vary over a comparatively large range, which indicates that there are persistent difficulties in carrying out exact measurements.…”

Section: Introductionmentioning

confidence: 99%

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Determination of Femoral Neck Angle and Torsion Angle Utilizing a Novel Three-Dimensional Modeling and Analytical Technology Based on CT Datasets

et al. 2016

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IntroductionExact knowledge of femoral neck inclination and torsion angles is important in recognizing, understanding and treating pathologic conditions in the hip joint. However, published results vary widely between different studies, which indicates that there are persistent difficulties in carrying out exact measurements.MethodsA three dimensional modeling and analytical technology was used for the analysis of 1070 CT datasets of skeletally mature femurs. Individual femoral neck angles and torsion angles were precisely computed, in order to establish whether gender, age, body mass index and ethnicity influence femoral neck angles and torsion angles.ResultsThe median femoral neck angle was 122.2° (range 100.1–146.2°, IQR 117.9–125.6°). There are significant gender (female 123.0° vs. male 121.5°; p = 0.007) and ethnic (Asian 123.2° vs. Caucasian 121.9°; p = 0.0009) differences. The median femoral torsion angle was 14.2° (-23.6–48.7°, IQR 7.4–20.4°). There are significant gender differences (female 16.4° vs. male 12.1°; p = 0.0001). Femoral retroversion was found in 7.8% of the subjects.ConclusionPrecise femoral neck and torsion angles were obtained in over one thousand cases. Systematic deviations in measurement due to human error were eliminated by using automated high accuracy morphometric analysis. Small but significant gender and ethnic differences were found in femoral neck and torsion angles.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Determination of Femoral Neck Angle and Torsion Angle Utilizing a Novel Three-Dimensional Modeling and Analytical Technology Based on CT Datasets

et al. 2016

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“…Where scans are not aligned with the femoral shaft axis, calculation may be needed to transform the torsion to a reference plane, as positioning-related measurement errors can be as large as 8.8° (Hermann and Egund, 1997). After 3D rendering of the proximal femur it is possible to take an oblique slice along the femoral neck angle in the coronal plane (Kim et al, 2000b;Jarrett et al, 2010) or compute the femoral neck axis in 3D (Sugano et al, 1998a;Kim et al, 2000a;Lee et al, 2006;Berryman et al, 2014). The distal femoral axis can be evaluated with one single axial slice with reference to one of the axes described earlier.…”

Section: Computed Tomography (Ct)mentioning

confidence: 99%

Femoral anteversion: significance and measurement

et al. 2020

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Femoral neck anteversion (FNA), also called femoral torsion or femoral version, is the angle between the projection of two lines in the axial plane perpendicular to the femoral shaft; one line going through the proximal femoral neck region and the second one through the distal condylar region (Figure 1), indicating the degree of 'twist' of the femur. FNA affects the biomechanics of the hip, as moment arms and the line of action of muscles around the joint are altered. As a result, FNA is associated with differences in gait and is a risk factor for clinical problems

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“…The true neck shaft angle and anteversion were derived using the formula, and the results were compared with those determined using computed tomography, in which the anteversion was measured using the axial oblique plane (parallel to the femoral neck axis) and the transcondylar plane. 16 The formula was based on trigonometry. When the femur rotates along its shaft axis, the neck shaft angle eventually becomes a straight line in the anteroposterior view.…”

Section: Methodsmentioning

confidence: 99%

A 45-Degree Radiographic Method for Measuring the Neck Shaft Angle and Anteversion of the Femur: A Pilot Study

Teo

Kassim

Thevarajan

2013

J Orthop Surg (Hong Kong)

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ABSTRACTpurpose. To propose a novel method to measure the neck shaft angle and anteversion of the femur using anteroposterior and 45º oblique radiographs. Methods. Three human subjects were used to verify the 45º oblique method. The true neck shaft angle and anteversion of the femur were determined using computed tomography. The true values were compared with the values derived by the 45º oblique method after correcting the distortion using a formula. results. With the true values based on computed tomography as references, the neck shaft angle and anteversion of the 3 subjects deviated +0.82º to +4.66º and -2.14º to +2.55º in lateral 45º oblique radiographs, respectively, whereas the corresponding values in medial 45º oblique radiographs were +0.98º to +5.93º and -10.09º to +1.58º. The lateral 45º oblique method resulted in smaller range of deviation and were more accurate. conclusion. This 45º oblique method is useful in surgical planning, especially for femoral derotational A 45-degree radiographic method for measuring the neck shaft angle and anteversion of the femur: a pilot study

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Axial Oblique CT to Assess Femoral Anteversion

Cited by 65 publications

References 9 publications

Determination of Femoral Neck Angle and Torsion Angle Utilizing a Novel Three-Dimensional Modeling and Analytical Technology Based on CT Datasets

Determination of Femoral Neck Angle and Torsion Angle Utilizing a Novel Three-Dimensional Modeling and Analytical Technology Based on CT Datasets

Femoral anteversion: significance and measurement

A 45-Degree Radiographic Method for Measuring the Neck Shaft Angle and Anteversion of the Femur: A Pilot Study

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