Table 1 Definition of the histological types of periprosthetic membranes (Krenn and Morawietz et al.)
Type | Characteristics |
|---|---|
Type I – Periprosthetic membrane of the wear particle induced type | Infiltration of predominantly macrophages and multinuclear giant cells containing PE particles |
Type II – Periprosthetic membrane of the infectious type | Activated fibroblasts, proliferation of small blood vessels, oedema, and inflammatory infiltrate of neutrophilic granulocytes |
Type III – Periprosthetic membrane of the combined type | Combination of the histomorphological changes described for types I and II |
Type IV – Periprosthetic membrane of the indeterminate type (non infected, non wear particle induced) | Connective tissue low in cells and rich in collagen fibres |