Phenotyping the Alignment of the Lower Limb

Primary outcomes

1. 3D reconstruction with 15 anatomical and biomechanical parameter of the lower limb

   Time frame: 6 months

   Based on the stereo radiographs, SterEOS 3D reconstruction will be done. The SterEOS software calculates automatically 15 parameters including:

   • Length of the femoral mechanical axis (femur length) - mm

2. 3D reconstruction with 15 anatomical and biomechanical parameter of the lower limb

   Time frame: 6 months

   Based on the stereo radiographs, SterEOS 3D reconstruction will be done. The SterEOS software calculates automatically 15 parameters, including:

   • Length of the tibial mechanical axis (tibia length) - mm

3. 3D reconstruction with 15 anatomical and biomechanical parameter of the lower limb

   Time frame: 6 months

   Based on the stereo radiographs, SterEOS 3D reconstruction will be done. The SterEOS software calculates automatically 15 parameters including:

   • The length of the lower limb (limb length) - mm

4. 3D reconstruction with 15 anatomical and biomechanical parameter of the lower limb

   Time frame: 6 months

   Based on the stereo radiographs, SterEOS 3D reconstruction will be done. The SterEOS software calculates automatically 15 parameters including:

   • Femoral head diameter - mm

5. 3D reconstruction with 15 anatomical and biomechanical parameter of the lower limb

   Time frame: 6 months

   Based on the stereo radiographs, SterEOS 3D reconstruction will be done. The SterEOS software calculates automatically 15 parameters including:

   • Neck length (the distance between the centre of the femoral head and the proximal diaphyseal axis, when following the axis of the femoral neck) - mm

6. 3D reconstruction with 15 anatomical and biomechanical parameter of the lower limb

   Time frame: 6 months

   Based on the stereo radiographs, SterEOS 3D reconstruction will be done. The SterEOS software calculates automatically 15 parameters including:

   • Neck shaft angle, aka the collodiaphyseal angle (CD angle, the angle between the femoral neck axis and the proximal diaphysis axis) - degrees

7. 3D reconstruction with 15 anatomical and biomechanical parameter of the lower limb

   Time frame: 6 months

   Based on the stereo radiographs, SterEOS 3D reconstruction will be done. The SterEOS software calculates automatically 15 parameters including:

   • Femoral offset (the distance between the centre of the femoral head and the closest point of the femoral shaft axis) - mm

8. 3D reconstruction with 15 anatomical and biomechanical parameter of the lower limb

   Time frame: 6 months

   Based on the stereo radiographs, SterEOS 3D reconstruction will be done. The SterEOS software calculates automatically 15 parameters including:

   • Mechanical tibiofemoral angle (mTFA, the angle between the mechanical axis of the femur (which passes from the femoral head through the centre of the distal femur) and the mechanical axis of the tibia (from the centre of the proximal tibia to the middle of the ankle) in the frontal plane of knee (convention dictates that in the varus position angles are negative, and in valgus positive) - degrees

9. 3D reconstruction with 15 anatomical and biomechanical parameter of the lower limb

   Time frame: 6 months

   Based on the stereo radiographs, SterEOS 3D reconstruction will be done. The SterEOS software calculates automatically 15 parameters including:

   • Sagittal tibiofemoral angle (sTFA, the angle between the femural and tibial mechanical axis in the sagittal plane) - degrees

10. 3D reconstruction with 15 anatomical and biomechanical parameter of the lower limb

    Time frame: 6 months

    Based on the stereo radiographs, SterEOS 3D reconstruction will be done. The SterEOS software calculates automatically 15 parameters including:

    • Femoral mechanical axis-femoral shaft angle (FM-FS, the angle between the mechanical and anatomical axis of the femur in the frontal plane of the knee) - degrees

11. 3D reconstruction with 15 anatomical and biomechanical parameter of the lower limb

    Time frame: 6 months

    Based on the stereo radiographs, SterEOS 3D reconstruction will be done. The SterEOS software calculates automatically 15 parameters including:

    • Femur mechanical angle (FMA, the angle between the femoral mechanical axis and the tangent of the femoral condyles medially) - degrees

12. 3D reconstruction with 15 anatomical and biomechanical parameter of the lower limb

    Time frame: 6 months

    Based on the stereo radiographs, SterEOS 3D reconstruction will be done. The SterEOS software calculates automatically 15 parameters including:

    • Tibial mechanical angle (TMA, the angle between tibial mechanical axis and the tangent of the tibia plateau medially) - degrees

13. 3D reconstruction with 15 anatomical and biomechanical parameter of the lower limb

    Time frame: 6 months

    Based on the stereo radiographs, SterEOS 3D reconstruction will be done. The SterEOS software calculates automatically 15 parameters including:

    • Femoral torsion (the angle between the femoral neck axis and the posterior condylar line projected on a plane perpendicular to the mechanical axis of the femur) - degrees

14. 3D reconstruction with 15 anatomical and biomechanical parameter of the lower limb

    Time frame: 6 months

    Based on the stereo radiographs, SterEOS 3D reconstruction will be done. The SterEOS software calculates automatically 15 parameters including:

    • Tibial torsion (the angle between the transmalleolar and transcondylar axis projected on a plane perpendicular to the mechanical axis of the tibia) - degrees

15. 3D reconstruction with 15 anatomical and biomechanical parameter of the lower limb

    Time frame: 6 months

    Based on the stereo radiographs, SterEOS 3D reconstruction will be done. The SterEOS software calculates automatically 15 parameters including:

    • Femorotibial rotation (the angle between the posterior condylar line of the femur and tibia) - degrees