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[Studies of explanted shot-peened osteosynthesis plates]
Zeitschrift Fur Orthopadie Und Ihre Grenzgebiete
|May 1, 1986
Summary
Shot peening enhances osteosynthesis plate fatigue life without altering corrosion properties. Explanted plates showed fewer pits and comparable corrosion behavior to polished plates after implantation.
Area of Science:
- Biomaterials Science
- Orthopedic Surgery
- Materials Engineering
Background:
- Osteosynthesis plates are crucial for fracture fixation.
- Shot peening is a surface treatment to improve metal fatigue life.
- Understanding the long-term effects of shot peening on implant corrosion is vital.
Purpose of the Study:
- To evaluate the effect of shot peening on the corrosive properties and wear debris of osteosynthesis plates.
- To compare the performance of shot-peened versus polished plates after implantation in humans.
Main Methods:
- Shot peening using ceramic particles was applied to osteosynthesis plates.
- Plates were implanted for fracture fixation (intertrochanteric osteotomies).
- Explanted plates and surrounding tissues were analyzed metallurgically and histologically; elemental analysis performed using SEM.
Main Results:
- Shot-peened plates exhibited fewer pittings around screw holes compared to polished plates post-implantation.
- Corrosive and fretting particles were detected histologically, primarily near screws.
- Elemental analysis revealed differences in particle composition versus bulk alloy, attributed to surface layer enrichment (e.g., Cr).
- Corrosive behavior was comparable between shot-peened and polished plates in lab tests and after implantation.
Conclusions:
- Shot peening improves fatigue life of osteosynthesis plates without negatively impacting their corrosive properties.
- The surface treatment offers comparable or improved performance regarding pitting and wear debris compared to polished plates.
- Surface elemental composition, particularly chromium enrichment, plays a role in implant corrosion resistance.