wear

Definition

Biological response to particulate matter

- characterised by periprosthetic osteolysis

- stimulated by wear debris

- debris gains access to any area accessible by fluid

Sources of particulate debris

1.  Wear

Mechanisms of wear

Issues

Wear

Stability

Normal feel of hip

Increased ROM

Wear

Large head

- increase volumetric wear

- less penetrative / linear  wear

Small head

- increased linear wear

- decreased volumetric wear