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3D finite element model of the upper femur. (A) Frontal and rear images of the 3D finite element model in the Abaqus software. Upper: Displacement cloud map; Lower: Stress cloud map. (B) Schematic of tantalum rod implantation into the different positions of the osteonecrosis area (from left to right: outside, middle, and inside) for ONFH in the cone-shaped range of 60°, 90°, and 120°.
