EP1.58 The Influence of Functional Antetorsion and Femoral Version on the Dynamic Femoral Neck Orientation

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ID: 330967
2026
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Abstract
Abstract Introduction Femoral version (FV) is a well-recognized measure of femoral morphology and is associated with non-arthritic hip disorders. Functional antetorsion (FA) is a newer metric measuring the angle between the posterior femoral condyles and a line from the femoral head center to the midpoint of the greater trochanter (GT) axis in the transverse plane. FA integrates the spatial orientation of the GT into torsional assessment. There has been little done to evaluate the impact of FV and FA on axial plane hip kinematics. Methods Synchronized biplane radiographs were collected during walking for 20 asymptomatic participants. Hip joint kinematics were generated by matching CT-derived 3D bone models to the biplane radiographs with validated sub-millimeter accuracy. FA and FV were measured on CT by three physicians. Markers were placed on digital 3D bone models to define: femoral head-neck axis, greater trochanteric axis, and axial pelvic axis. The angle between the femoral neck axis and the axial pelvic axis (the dynamic femoral neck orientation) was calculated throughout the gait cycle and normalized to the static standing value. Linear mixed-effects model with an interaction term was utilized to evaluate the independent and interactive effects of FA and FV on the dynamic femoral neck orientation. Pearson correlation coefficient was used to evaluate the relationship between FA and FV. Results FA was significantly correlated with femoral version (r=0.95; p<0.001). Greater FA led to a decrease in the dynamic femoral neck orientation during gait (β=-0.94; p<0.01). A significant interaction between FA and FV was observed across the average, maximum, and minimum femoral neck orientation during gait (β=0.014-0.016; p<0.05), so that increasing FV tempered the effect of FA. Discussion As FA increases, the femoral neck axis is oriented less anteriorly during gait, but its influence is lessened with increasing FV. These findings improve our understanding of the complex interplay between FV and FA as they impact axial plane biomechanics.
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Authors Connor Luck, Edward Godbold, Grace Armet, William J. Anderst, Michael P. McClincy
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Journal Journal of hip preservation surgery
Year 2026
DOI
10.1093/jhps/hnag043.242
URL
https://doi.org/10.1093/jhps/hnag043.242
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