The Availability of Radiological Measurement of Femoral Anteversion Angle: Three-Dimensional Computed Tomography Reconstruction

Ha Young Byun; 신희석; 이은신; Min Sik Kong; Seung Hun Lee; Chang Hee Lee

The Availability of Radiological Measurement of Femoral Anteversion Angle: Three-Dimensional Computed Tomography Reconstruction

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Type: Academic journal

Author: Ha Young Byun 신희석 이은신 Min Sik Kong Seung Hun Lee Chang Hee Lee

Journal: Korean Academy Of Rehabilitation Medicine Annals of Rehabilitation Medicine Annals of Rehabilitation Medicine 제40권 제2호 KCI Accredited Journals

Published: 2016.1

Pages: 237 - 243 (7page)

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The Availability of Radiological Measurement of Femoral Anteversion Angle: Three-Dimensional Computed Tomography Reconstruction

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Objective To assess the intra-rater and inter-rater reliability for measuring femoral anteversion angle (FAA) by a radiographic method using three-dimensional computed tomography reconstruction (3D-CT).Methods The study included 82 children who presented with intoeing gait. 3D-CT data taken between 2006 and 2014 were retrospectively reviewed. FAA was measured by 3D-CT. FAA is defined as the angle between the long axis of the femur neck and condylar axis of the distal femur. FAA measurement was performed twice at both lower extremities by each rater. The intra-rater and inter-rater reliability were calculated by intraclass correlation coefficient (ICC). Results One hundred and sixty-four lower limbs of 82 children (31 boys and 51 girls, 6.3±3.2 years old) were included. The ICCs of intra-rater measurement for the angle of femoral neck axis (NA) were 0.89 for rater A and 0.96 for rater B, and those of condylar axis (CA) were 0.99 for rater A and 0.99 for rater B, respectively. The ICC of inter-rater measurement for the angle of NA was 0.89 and that of CA was 0.92. By each rater, the ICCs of the intra-rater measurement for FAA were 0.97 for rater A and 0.95 for rater B, respectively and the ICC of the inter-rater measurement for FAA was 0.89. Conclusion The 3D-CT measures for FAA are reliable within individual raters and between different raters. The 3D-CT measures of FAA can be a useful method for accurate diagnosis and follow-up of femoral anteversion.

#Three-dimensional imaging #Bone anteversion #Gait

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References (19)

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Kling TF Jr / 1983 / Angular and torsional deformities of the lower limbs in children / Clin Orthop Relat Res 176:136~147

Kumar SJ / 1982 / Torsional abnormalities in children’s lower extremities / Orthop Clin North Am 13:629~639

Cibulka MT / 2004 / Determination and significance of femoral neck anteversion / Phys Ther 84:550~558

Bobroff ED / 1999 / Femoral anteversion and neck-shaft angle in children with cerebral palsy / Clin Orthop Relat Res 364:194~204

Gelberman RH / 1987 / Femoral anteversion. A clinical assessment of idiopathic intoeing gait in children / J Bone Joint Surg Br 69:75~79

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