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TRIBOLOGY: Retrieval Studies of Femoral and Poly Components
- 1. Retrieval studies of femoral and polyethylene components Dr VAIBHAV BAGARIA Director - Orthopedics Sir HN Reliance Foundation Hospital President - SICOT India MUMBAI, India
- 3. Entropy!
- 4. Retrievals shouldn’t Badly written Obituaries
- 5. Retrievals • Snap Shot of a long and complex history! • Value added with right history and right mix of people • Biased - as they represent ‘Failures’ (except Cadaveric) • Tribologist/ Corrosion Specialists/ Ceramic specialists
- 6. Data Enhancement • Complete clinical and radiological history • Big series (registry-like) to offer case vs control studies • Multi-scale analysis (nano to macro) • Quantitative (volumes) and qualitative (shapes, areas) analysis • Other kinds of sampling: blood, particles, tissues
- 7. What story do they tell? • Quantity • Quality • Special Additions • Design • Sterilisation • Patient Characteristic • Surgical technique
- 8. How do they tell this story? • Modes: 1 (intended); 2, 3 ,4 ( unintended) • Mechanisms: Adhesion, Abrasion, Fatigue • Damage: burnishing, abrasion, scratches, plastic deformation, cracks, pits, delamination, and embedded third bodies • Debris: Nanometers to visible to naked eye! ‘‘Whenever a new scientific discipline emerges, it not only encompasses the concepts of those subjects o Professor David F. Williams; The Williams Dictionary of Biomaterials, 1999
- 29. Take Home Message • Retrievals are a Treasure Trove • Looked in isolation = Badly written Obituary • Data enhancement help make this snapshot into a cinema. • Can be biased because it is about failure • Retrieval programs should be encouraged!