Measuring anteversion in the femoral neck from routine radiographs

Hermann, Knud; Egund, Niels

doi:10.1080/02841859809172455

Cited by 25 publications

(10 citation statements)

References 16 publications

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“…Pre-operative calculations of femoral torsion, version and offset as well as acetabular version and inclination have been previously undertaken using plain radiographs [5,6], and subsequently more accurately using CT scanning [7]. The use of CT guidance in the placement of prostheses has been shown to significantly improve the post-operative component positions compared with freehand techniques [8].…”

Section: Introductionmentioning

confidence: 99%

Differences in hip morphology between the sexes in patients undergoing hip resurfacing

et al. 2010

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There is limited morphological data on the sex differences between the commonly used pelvic parameters. This study analysed the CT scans of 100 consecutive Caucasian patients, 61 males and 39 females, undergoing hip resurfacing arthroplasty surgery for hip osteoarthritis in one institution.There were no sex differences in femoral torsion/anteversion, femoral neck angle and acetabular inclination. Males had a mean femoral torsion/anteversion of 8 degrees (range -5 to 26 degrees), a mean femoral neck angle of 129 degrees (range 119 to 138 degrees) and a mean acetabular inclination of 55 degrees (range 40 to 86 degrees). Females had a mean femoral torsion/anteversion of 9 degrees (range -2 to 31 degrees), a mean femoral neck angle of 128 degrees (range 121 to 138) and a mean acetabular inclination of 57 degrees (range 44 to 80 degrees). Females had a significantly greater acetabular version of 23 degrees (range 10 to 53) compared with 18 degrees in males (range 7 to 46 degrees (p = 0.02) and males had a significantly greater femoral offset of 55 mm (range 42 to 68 mm) compared with 48 mm (range 37 to 57 mm) in females (p = 0.00). There were no significant differences between measurements taken from each patient's right and left hips.These findings may be useful for the future design and the implantation of hip arthroplasty components.

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Section: Introductionmentioning

confidence: 99%

Differences in hip morphology between the sexes in patients undergoing hip resurfacing

et al. 2010

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“…Then, we calculated the stem anteversion (θ) using the formula by Ogata and Goldsand. [26] In brief, α = 180°-neck-shaft angle on AP view. β = 180°-radiological anteversion of the stem on translateral decubtus view.…”

Section: Calculation Of Real Stem Anteversion From Radiological Stem mentioning

confidence: 99%

“…Implant malposition is an important risk factor for dislocation after total hip replacement (THR) and accurate assessment of implant position is critical to determine whether to change the implant in dislocating THR. [1][2][3][4][5][6][7][8][9][10][11][12] Although computerized tomography (CT) scan is accurate in the measurement of the acetabular and femoral component position, it has definite limitation due to cost and risk of radiation hazard. [13][14][15][16] Several studies reported radiological methods to measure the abduction and version of the acetabular component using plain radiograph.…”

Section: Introductionmentioning

confidence: 99%

Trans-lateral Decubitus Radiograph of the Hip: A New View to Measure the Version of the Femoral Stem

Yoo

Ahn

et al. 2019

Preprint

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Background We developed a radiological method, trans-lateral decubitus view, to measure stem version and assessed its reliability as well as the validity.Methods Trans-lateral decubitus view of the hip was a lateral radiograph, which was taken with the patient in lateral decubitus position, hip extension, 90° knee flexion and patella facing forward. In 40 patients, who underwent total hip replacement (THR), a trans-lateral decubitus view and CT scan of the hip were taken. Three observers measured stem neck-shaft angle (α) on hip AP view, and the stem anteversion (β), which was the angle between the axis of stem neck and axis of the femur, on the trans-lateral decubitus view. The stem version (θ) was calculated using the formula; θ = arc ((tan (180°-β) /tan (180°-α)). The intra and inter-observer reliabilities of each measurement were examined. The radiological measurements were compared with those on the CT scan to evaluate their validity.Results The mean stem anteversion on radiological measurement was 23.72° (SD 8.17) and the mean CT measurement was 23.91° (SD 10.25) (p = 0.929). The intra- and interobserver reliabilities of the radiological measurements were 0.934 and 0.931, respectively. Those of CT measurements were 0.941 and 0.942, respectively. When the radiological anteversion was between -30° and 30°, the correlation coefficient between radiological measurements and CT measurements was 0.729 (p = 0.001).Conclusion The trans-lateral decubitus method appears reliable and valid for the measurement of femoral stem version. Trial Registration: NCT02554149 (29 March 2016).

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“…Egund and Palmer [1] describe a method which consists of acquiring several CT slices at selected locations, manually extracting geometric features from those slices, defining a reference plane and a plane though the femur head from the features, and measuring anteversion as the angle between the plane normals. Herman and Egund [3] propose to measure anteversion from three CT slices and from fluoroscopic images of the whole femur at precise predetermined viewpoints. The method requires significant manual user intervention.…”

Section: Previous Workmentioning

confidence: 99%

Computer-Based Periaxial Rotation Measurement for Aligning Fractured Femur Fragments: Method and Preliminary Results

Ron

Joskowicz

Simkin

et al. 2001

Medical Image Computing and Computer-Assisted Intervention – MICCAI 2001

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We describe a new computer-based method for periaxial rotation measurement of healthy and fractured femurs during closed femoral fracture reduction surgery from CT. The method provides a comparative quantitative measure to align the distal and proximal femur fragments based on periaxial rotation. We define periaxial rotation in terms of patient-specific bone features and describe an algorithm for automatically extracting these features from the CT. The algorthm extracts condyle landmarks and neck axis of the healthy bone, determines its periaxial rotation, and extrapolates this data, assuming mirror symmetry between the healthy and the fractured bone, to measure periaxial rotation between the fractured fragments. Unlike existing techniques, our method requires minimal user intervention. We applied the method to a patient data set and simulated a reduction based on the anteversion measurements with satisfactory results.

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Measuring anteversion in the femoral neck from routine radiographs

Abstract: FNA measurement can be made from a routine radiographic examination of the hip and a lateral view of the knee. This method achieves an acceptable level of accuracy and reproducibility.

Cited by 25 publications

References 16 publications

Differences in hip morphology between the sexes in patients undergoing hip resurfacing

Differences in hip morphology between the sexes in patients undergoing hip resurfacing

Trans-lateral Decubitus Radiograph of the Hip: A New View to Measure the Version of the Femoral Stem

Computer-Based Periaxial Rotation Measurement for Aligning Fractured Femur Fragments: Method and Preliminary Results

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