charnley zones

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

Indications

Neoplastic / metastatic

Severe osteoporosis

Pagets

Longetivity

Ranawat 

- longevity directly related to quality of cement penetration into acetabulum

Types

Reflection all Poly (S&N)