| |
Then |
Now |
Hip & Shoulder Joints [17,74]
Materials |
Stainless steel fitted to bone with bolts and screws |
Low Friction Arthroplasty:
Metal femoral stem with coatings
Polyethylene acetabular component
Acrylic bone cement |
| Benefits |
Hard material mimicking bone structure |
Ability to adjust leg length
Reduces wear due to smaller head
Decreased corrosion |
| Limitations |
Leaching of metal ions
Low wear resistance
Infection
Corrosion
Insufficient strength |
Polyethylene debris contributing to aseptic loosening
Irradiation of material through gamma particles |
Knee Joints [75]
Materials |
All stainless steel components |
Metal femoral component (Ti allows stainless steel or cobalt chromium with small amount of molybdenum)
UHMWPE tibial inserts
UHMWPE patella/kneecap |
| Benefits |
Rigidity
Movement |
Corrosion resistance
Frictional movement
Optimum articulation
Reduced wear due to flatter bearing |
| Limitations |
Infection
Loosening |
Fixation of the grafts |
