| About this Abstract |
| Meeting |
Materials Science & Technology 2011
|
| Symposium
|
Next Generation Biomaterials
|
| Presentation Title |
Directed Bone Regeneration to Prevent Fatigue Failure of Osteoceramic Orthopedic Implants |
| Author(s) |
Thomas D. McGee |
| On-Site Speaker (Planned) |
Thomas D. McGee |
| Abstract Scope |
Dense bulk calcium phosphates fail in tensile fatigue because their bioactivity introduces Griffith flaws. Osteoceramic(OC) orthopedic implants are 50 vol% tricalcium phosphate (TCP) and 50 vol% of an inert second phase such as magnesium aluminate (MA). The flaw size of the MA does not change when the TCP is dissolved so the strength remains enduring. However fatigue failure is still expected. The external geometry of the implant can be manipulated to direct bone regeneration and encapsulation such that the bone reinforces the implant/bone composite structure and fatigue failure is preventd. When a fatigue crack does appear TCP is released and induces bone remodeling to support the load. The Osteoceramic composite is a smart material. Examples of successful reinforcement in this way are given for OC-Implants used as artifical bone grafts. Results include macro radiographs, CAT scans, and microscpic and SEM evaluation of recovered sections. |
| Proceedings Inclusion? |
Undecided |