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Table 2 Histological scoring criteria

From: Biocompatibility study of different hyaluronan products for intra-articular treatment of knee osteoarthritis

  Histological findings Score
Synovial thickening Lining cell layer 1–2 cells thick 0
Lining cell layer 3–5 cells thick 1
Lining cell layer 6–8 cells thick and/ or mild increase in cellularity 2
Lining cell layer > 9 cells thick and/ or severe increase in cellularity 3
Inflammatory cell infiltration None 0
Slight 1
Moderate 2
Severe 3