Metals
Semiconductor Materials
Ceramics
Polymers
Synthetic BIOMATERIALS
Orthopedic screws/fixation
Dental Implants Dental Implants
Heart valves
Bone replacements
BiosensorsImplantable Microelectrodes
Skin/cartilageDrug Delivery Devices
Ocular implants
Biomaterial ScienceBiomaterial Science
Bileaflet Heart ValvesBileaflet Heart Valves
Dental ImplantsDental Implants
Intraocular LensesIntraocular Lenses
Implantation often performed on Implantation often performed on outpatient basis.outpatient basis.
Vascular GraftsVascular Grafts
Must Be Flexible.Must Be Flexible. Designed With Designed With
Open Porous Open Porous Structure.Structure.
Often Recognized Often Recognized By Body As By Body As Foreign.Foreign.
Hip-ReplacementsHip-Replacements
Normal versus Arthritic Normal versus Arthritic HipHip
Normal Hip: note the space between the femur and
acetabulum, due to cartilage
Arthritic Hip: No space visible in joint, as
cartilage is missing
using a Polymethylmethacrylate (PMMA) cement to adhere the
metal to the bone
using a porous metal surface to create a bone
ingrowth interface
Two attachment methodsTwo attachment methods
the acetabulum and the proximal femur have been replaced. The
femoral side is completely metal. The acetabular side is composed
of the polyethylene bearing surface
Overview of femoral Overview of femoral replacementreplacement
The two materials are bonded and equal force is
applied to both
Load transfer in Composite Load transfer in Composite materialsmaterials
Comparison: Moduli of Comparison: Moduli of ElasticityElasticity
Modulus of elasticity of different implant materials and bone (in GPa)
Implant bondingImplant bonding
A bonded interface is characteristic of a
cemented prosthesis (left)
non-bonded interface is characteristic of a non-
cemented press fit prosthesis (right)
Degradation ProblemsDegradation Problems
Example of fractured artificial cartilage from a failed hip replacement