Table 1.

Histological score of tendon repair

Score	Collagen	Angiogenesis	Cellularity
0	dense, clearly defined parallel collagen bundles oriented tangentally	a sparse network of small arteries oriented parallel to the collagen fibers in thin, fibrous septa between the bundles	fairly even, sparse distribution of cells with thin wavy nuclei located between collagen bundles
1	less than 25% of collagen bundles have a diffuse structure with blurring of individual bundles	less than 25% irregular vascularization: increased capillaries	less than 25% abnormal increased cellularity with rounded nuclei oriented in rows
2	less than 50% of collagen bundles have a diffuse structure with blurring of individual bundles	less than 50% irregular vascularization: increased capillaries; groups of thick-walled vessels distributed unevenly in the hypercellular tendon	less than 50% abnormal increased cellularity with rounded nuclei oriented in rows
3	more than 50% of collagen bundles have a diffuse structure with blurring of individual bundles	more than 50% irregular vascularization: increased capillaries; groups of thick-walled vessels distributed unevenly in the hypercellular tendon; proliferating vessels are nodular and may be perpendicular to the collagen bundles	more than 50% abnormal increased cellularity with rounded nuclei oriented in rows