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Table 3 Scoring system for histological assessment of FDP tendons

From: The effect of mesenchymal stromal cell sheets on the inflammatory stage of flexor tendon healing

Score Cellularity/PMN/MN FB Vascularity
1 <50 cells per HPF <5 % <5 vessels per HPF
2 51–100 cells per HPF 6–50 % 6–10 vessels per HPF
3 101–150 cells per HPF >50 % >10 per HPF
4 >150 cells per HPF   
  1. FDP flexor digitorum profundus, PMN polymorphonuclear cell, MN mononuclear cell and macrophage, FB fibroblast, HPF high-power field under a 20 × objective