Journal article

Defining the medial-lateral axis of the femur: Medical imaging, conventional and functional calibration methods lead to differences in hip rotation kinematics for children with torsional deformities

Elyse Passmore, H Kerr Graham, Morgan Sangeux



Hip rotation during gait is a major indicator for femoral derotation osteotomy. However, repeatability of hip rotation is poor because of discrepancies in determining the medial-lateral axis of the femur. Combining 3D gait analysis with medical imaging allows in vivo evaluation of current clinical methods. We used the condylar axis, identified from low dose biplanar radiographs (EOS imaging Inc), as our reference to evaluate conventional, functional calibration and freehand 3D ultrasound methods to define the medial-lateral axis in children with lower-limb torsional deformities. Twenty participants underwent 3D gait analysis accompanied by freehand 3D ultrasound and biplanar radiographs. The..

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Awarded by NHMRC

Funding Acknowledgements

This research was supported by the Victorian Government's Operational Infrastructure Support Program. The author EP acknowledges support from an Australian Government Research Training Program Scholarship and the NHMRC-funded Centre of Research Excellence in Cerebral Palsy (#1057997). The author MS received funding from the Murdoch Children's Research Institute and The Royal Children's Hospital Foundation. The funding sources played no role in study design; in the collection, analysis and interpretation of data; in the writing of the report; and in the decision to submit the manuscript for publication.