Topological optimization of hip spacer reinforcement.

Area of Science:

• Biomedical Engineering
• Orthopedic Surgery
• Materials Science

Background:

• Periprosthetic joint infections (PJI) require effective treatment, with antibiotic-enriched hip spacers being optimal.
• Reinforcement of hip spacers significantly improves mechanical integrity.
• Accurate mechanical behavior prediction is crucial for spacer design.

Purpose of the Study:

• To perform topological optimization on a reinforced hip spacer model.
• To identify optimal reinforcement topology for enhanced mechanical properties and bone preservation.
• To minimize the volume of the reinforcement while maintaining efficacy.

Main Methods:

• Utilized a validated numerical model for topological optimization.
• Employed the explicit method for mechanical behavior analysis.
• Evaluated various topologies for stress shielding prevention and mechanical enhancement.

Main Results:

• An 8mm thick titanium reinforcement was identified as the most effective.
• Topological optimization reduced the reinforcement volume to 70% of its original size.
• The optimized design demonstrated superior mechanical properties and reduced stress shielding.

Conclusions:

• Topological optimization is a key strategy for designing effective reinforced hip spacers.
• Optimized titanium reinforcements enhance mechanical performance and prevent bone demineralization.
• Reduced volume, optimized reinforcements offer a promising solution for PJI treatment.