Prosthetic Devices

Introduction

Implanted prosthetic devices are used for functional, cosmetic, or therapeutic purposes in medical treatments. These include a wide range of implants, such as breast implants, catheters, and joint replacements like hips and knees. Demand is rising rapidly—over 102,000 knee replacements and 91,000 hip replacements are performed annually in the UK, with projections of +174% (hips) and +673% (knees) by 2050. Despite successes, complications such as prosthetic joint infections (PJIs) remain a major cause of failure, extended recovery, and increased cost, impacting quality of life and healthcare systems.

Task

Design an innovative method or procedure to protect patients from infections following total hip or knee replacements. Prioritise minimising infection risks and long-term system burden (e.g., on the NHS) while ensuring material sustainability and biocompatibility. Begin by surveying current implants and materials (cost, availability, effectiveness). Your solution should be affordable, reduce infection/rejection rates, and deliver long-term benefits for patients and providers.

Considerations

1. Technology

Biocompatibility is critical. Review state-of-the-art materials and explore innovations such as antimicrobial/antifouling coatings, drug-eluting surfaces, surface texturing, and smart sensing for early infection detection.

Questions to consider:
  • What biocompatible materials are most effective at preventing infection in joint implants?
  • Which emerging technologies (e.g., antimicrobial coatings, silver/copper nanoparticles, bacteriophages) could improve safety and longevity?
  • How can surface chemistry/topography be engineered to inhibit biofilm formation without harming tissue integration?

2. Infrastructure

Ensure compatibility with existing surgical workflows, sterilisation, and peri-operative care. Consider manufacturing routes, QA/QC, and supply-chain constraints for hospitals of different sizes.

Questions to consider:
  • How does your solution integrate with current theatre practice and post-op care pathways?
  • What hospital resources/equipment are needed (e.g., coating units, storage, cold chain)?
  • What are the logistics for manufacturing, traceability, and delivery at scale?

3. Market Factors

Model affordability for providers and patients. Quantify reductions in revision surgeries, readmissions, and length of stay. Consider global scalability and regulatory pathways.

Questions to consider:
  • What is the cost impact versus current implants and infection-prevention methods?
  • How much could PJI rates, associated costs, and bed days be reduced?
  • Can the approach scale to meet increasing global demand?

4. Safety, Security, and Risks

Address surgical, post-op, and long-term risks. Consider adverse reactions, coating delamination, resistance, and monitoring for early infection signs. Plan verification/validation and post-market surveillance.

Questions to consider:
  • Which infections are most common after arthroplasty, and how does your design reduce their incidence?
  • What intra- and post-operative protocols complement your solution?
  • How do you mitigate long-term risks (failure, recurrence, complications)?

5. Project Management Approach

Outline stages for research, prototyping, benchtop and preclinical testing, and clinical translation. Include risk registers, responsibilities, and gated milestones.

Questions to consider:
  • Which methodology (Scrum/Sprints, Agile, Waterfall) best supports development and validation?
  • What are your key milestones and metrics for progress?
  • How will you allocate budget and roles across R&D, testing, and regulatory prep?

6. Costing and Feasibility

Provide a full cost model (materials, manufacturing, QA, distribution, training) and compare total cost of care to current practice. Consider HTA and reimbursement.

Questions to consider:
  • What are development, production, and distribution costs?
  • How does short-/long-term affordability compare with existing devices?
  • Is the solution financially sustainable and what ROI is expected?

7. Sustainability, Ethics, Equality, Diversity, and Inclusion

Minimise environmental footprint (materials, manufacturing, packaging, end-of-life). Ensure equitable access and ethical deployment across diverse populations and settings.

Questions to consider:
  • How do you reduce environmental impact across the device lifecycle?
  • What ethical issues (safety, consent, long-term outcomes) must be addressed?
  • How will the solution remain accessible to underserved communities?

Further Information

  1. The National Joint Registry Editorial Board. “15th Annual Report 2018.” Link
  2. Springer, B. D., et al. “Infection burden in total hip and knee arthroplasties …” Arthroplasty Today 3(2) (2017). Link
  3. Lenguerrand, E., et al. “Risk factors … knee replacement.” Lancet Infect. Dis. 19(6) (2019). Link
  4. Tande, A. J.; Patel, R. “Prosthetic joint infection.” Clin. Microbiol. Rev. 27(2) (2014). Link
  5. Karim, M. R., et al. “Nanotechnology and Prosthetic Devices …” Journal of Disability Research 3(3) (2024). Link