Calculation of Pediatric Femoral Fracture Rotation from Direct Roentgenograms

Overview

Journal J Orthop Traumatol

Specialties Emergency Medicine
Orthopedics

Date 2013 May 8

PMID 23649819

Citations 2

Authors

M S Ozel

I E Ketenci

E Kaya

S Tuna

B Saygi

Affiliations

Soon will be listed here.

Abstract

Background: Radiologic determination of pediatric femoral fracture rotation has been debated. Measuring the antetorsion angle of the fractured femur by computed tomography and comparing it with the opposite side has been the method of choice for this purpose. However, no simple method for direct measurement of femoral fracture rotation exists in the literature. In this study, our aim was to test a mathematical method of measuring the axial plane malrotation from direct roentgenograms.

Materials And Methods: A pediatric femoral shaft fracture model was produced. The bone was secured to a wooden frame that allowed the distal part of the fracture to rotate around an axis. Radiographs were taken at known intervals of rotation ranging from the neutral position to 60° external rotation and to 60° internal rotation in 5° increments of rotation. Five independent, blinded observers measured the radiographs and calculated the fracture rotation according to a standard formula. Calculated rotation values were compared with known rotation values.

Results: Calculated rotation values were close to actual rotation values throughout the arc of rotation. The mean absolute error of five observers for all measurements of external and internal rotation was 3.97° (±0.83). The correlation coefficient between calculated and actual rotation values was 0.9927. The interobserver intraclass correlation coefficient for calculated rotation was 0.997.

Conclusions: Absolute error and correlation coefficient values indicate that this method is accurate and reliable in determining the fracture rotation.

Citing Articles

Imaging-assisted intra-operative approach to torsional alignment in paediatric femoral shaft fractures treated with hip spica.

Jyoti N, Gopinathan N, Sudesh P, Prakash M, Rangasamy K J Clin Orthop Trauma. 2025; 64:102947.

PMID: 40061021 PMC: 11889955. DOI: 10.1016/j.jcot.2025.102947.

Remodeling of Rotational Malunion of Femoral Shaft in Children.

Kumar C, Reddy J, Jose M, Gahukamble A, Palocaren T, Madhuri V Indian J Orthop. 2024; 58(1):89-97.

PMID: 38161408 PMC: 10754778. DOI: 10.1007/s43465-023-01030-1.

Measurement of Malrotation on Direct Radiography in Pediatric Distal Radius Fractures: Prospective Observational Study.

Duymus T, Mutlu S, Komur B, Mutlu H, Yucel B, Parmaksizoglu A Medicine (Baltimore). 2016; 95(18):e3569.

PMID: 27149480 PMC: 4863797. DOI: 10.1097/MD.0000000000003569.

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