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Fig 1. | Journal of Orthopaedic Surgery and Research

Fig 1.

From: Three-dimensional morphological analysis of the femoral neck torsion angle—an anatomical study

Fig 1.

a–d The method for determining the 3D axis of the femoral neck and the “inertia axis” method. a The femur head was simulated as a closed sphere (blue) and the center of the sphere was defined as the center of the femur head, namely, point A. b A concentric (point A) sphere (green) was generated by increasing the radius of the sphere fitted to the femoral head by 2 mm, which cut the femoral neck to obtain a corresponding cross-section. This cross-section was treated as a fitting circle, with the center defined as point B. Finally, the connecting line between point A and B was considered the 3D axis of the femoral neck. c The 3D axis of the femoral neck and cross-section of the FNI. d The cross-section of the FNI was extruded to a 0.5-mm depth, and then the inertia axes (three blue lines) of the extruded part of the cross-section of the FNI were established using the “fit inertia axes” method in 3-Matic software

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