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Table 1 Histological grading system used to determine the rotator cuff healing outcomes

From: Augmentation with an ovine forestomach matrix scaffold improves histological outcomes of rotator cuff repair in a rat model

  Collagen fibre density Collagen fibre orientation Bone-tendon interface Vascularity Inflammation
0 None None 0–24 % interdigitation Abundant vascular network Abundant inflammatory cells
1 Low Disorganised fibres 25–49 % interdigitation Moderate vascular network Moderate inflammatory cells
2 Medium Moderate alignment 50–75 % interdigitation Minimal vascular network Minimal inflammatory cells
3 High Highly aligned >75 % interdigitation No vascular network No inflammatory cells