osteolysis

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

Aetiology

Post-traumatic (type III clavicle fractures)

Idiopathic

4 patterns 

1. OA with osteophytes 

-  contribute to impingement

2. Osteolysis with resorption & gross osteoporosis