Table 2 Histological evaluation system: cell type/response
Cell Type/Response | Score | ||||
|---|---|---|---|---|---|
0 | 1 | 2 | 3 | 4 | |
Polymorphonuclear cells | 0 | Rare, 1–5/phfa | 5–10/phf | Heavy infiltrate | Packed |
Lymphocytes | 0 | Rare, 1–5/phf | 5–10/phf | Heavy infiltrate | Packed |
Plasma cells | 0 | Rare, 1–5/phf | 5–10/phf | Heavy infiltrate | Packed |
Macrophages | 0 | Rare, 1–5/phf | 5–10/phf | Heavy infiltrate | Packed |
Giant cells | 0 | Rare, 1–5/phf | 5–10/phf | Heavy infiltrate | Packed |
Necrosis | 0 | Minimal | Mild | Moderate | Severe |
Neovascularisation | 0 | Minimal capillary proliferation, focal, 1–3 buds | Groups of 4–7 capillaries with supporting fibroblastic structures | Broad band of capillaries with supporting structures | Extensive band of capillaries with supporting fibroblastic structures |
Fibrosis | 0 | Narrow band | Moderately thick band | Thick band | Extensive band |
Fatty infiltrate | 0 | Minimal amount of fat associated with fibrosis | Several layers of fat and fibrosis | Elongated and broad accumulation of fat cells about the implant site | Extensive fat completely surrounding the implant |