40 / 2019-06-06 05:50:44

On the FE modelling of Short-Stem Porous Hip Implant Design for Preventing Stress Shielding & Promoting Osseointegration

Hip Implant,3D Printing

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Current hip implants often undergo revision surgery due to peri-prosthetic fracture or the severe pain experienced by the patient. These two problems usually occur in a patient that has been implanted with a fully solid hip implant. Solid implants have considerably higher stiffness when compared to the surrounding host bones. This causes stress shielding prior to bone resorption and eventually aseptic loosening of the implant. To prevent stress shielding, porous graded microstructure hip stems can be designed to mimic the surrounding bone tissue properties. These optimised porous topologies are now only possible to be manufactured via 3D printing technology such as selective laser melting (SLM). Current problem with optimised lattice structures is that individually optimized neighbouring cells do not necessarily form an integral part, and the physical properties along their shared boundaries are unpredictable and often inferior to those of the individual microstructures.