Type | A | B |
---|---|---|
Reconstructed regions | ROI 2–3 | ROI 2–3 or ROI-3 |
Regions of proximal stem and screws | ROI 1–2 | ROI 1–2 |
Proximal osteotomy plane | ROI 2 | ROI 2 or ROI 3 |
Distal osteotomy plane | ROI 3 | ROI 3 |
Proximal 3D-printed stem | Curved stem | Anchorage-slot stem |
Proximal screws | Tensile screws to enhance the stability and load-transfer | Cooperative utilization of locking screw(s) and tensile screws to provide reliable initial mechanical stability, enhance load-transfer and facilitate the later biological fixation |
Proximal screw insertions | Spongy bone | Calcar femorale and spongy bone |
Osteotomy implementation | Under 3D-printed osteotomy guide plate | Under 3D-printed osteotomy guide plate |
3D-printed bone-implant interfaces | Both proximal and distal interfaces | Both proximal and distal interfaces |
Anatomical advantages | Maximum retainment of calcar femorale and load-bear bone trabecula | Maximum retainment of calcar femorale and load-bear bone trabecula |
Biomechanical advantages | Obey the biomechanical distribution Provide strong supporting for the load-carrying of calcar femorale and medial cortical bone Enhance the load-transfer from the femoral head and neck | Obey the biomechanical distribution Stabilize the mechanical system of proximal metaphysis and calcar femorale Enhance the load-transfer from the femoral head and neck |
Fixation plate | Lateral plate is preferential | Lateral plate is preferential |
Reestablishment of attachment | Iliopsoas insertion | Iliopsoas insertion if resected |