metallosis

Bearing Surfaces

Wear

 

The removal of material, with the generation of wear particles under an applied load and in relative motion

 

Tribology is the study of wear and lubrication

 

Wear mechanisms

 

Adhesion

- bonding of the surfaces when pressed together

- may pull away material from the weaker surface

 

Abrasion

- asperities on the harder surface cut and plough 

Resurfacing

ConceptBirmingham Hip Resurfacing

 

Femur

- removal of femoral head cartilage

- resurfacing with metal

- cemented / uncemented

 

Acetabulum

- standard technique

 

Bearing surface

- metal on metal

 

Indications

 

Relatively young man (40 - 50)

OA