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Fig. 4 | BMC Musculoskeletal Disorders

Fig. 4

From: Reconstruction of massive bone defects after femoral tumor resection using two new-designed 3D-printed intercalary prostheses: a clinical analytic study with the cooperative utilization of multiple technologies

Fig. 4

Anatomic determination by HU value and biomechanical analysis by finite element in 3D-printed implants. A The preplanned position of the proximal curved stem in the Type A prosthesis, with the optimized preservation and abutment of the calcar femorale (thresholding by HU value). B The preplanned position of the proximal anchorage-slot stem in the Type B prosthesis, with the optimized locking screw insertion in the calcar femorale (thresholding by HU value). C The preplanned position of proximal screws in Type A prosthesis, with the optimized preservation of trabecular bone (thresholding by HU value). D The preplanned position of the proximal anchorage-slot stem and locking screws in Type B prostheses, with the optimized preservation of trabecular bone (thresholding by HU value). E The preplanned position of the proximal curved stem and screws in the Type A prosthesis obeying the stress distribution defined by FEA. F The preplanned position of the proximal anchorage-slot stem and locking screws in Type B prostheses obeying the stress distribution defined by FEA. Images (A, C, E) from Patient 1. Images (B, D, F) from Patient 3

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