Optimal concentration of mesenchymal stem cells for fracture healing in a rat model with long bone fracture

Table 1 Fracture healing scores according to the histological findings

Score	Histological findings
1	Fibrous tissue
2	Predominantly fibrous tissue with small amount of cartilage
3	Equal mixture of fibrous and cartilaginous tissue
4	Predominantly cartilage with small amount of fibrous tissue
5	Cartilage
6	Predominantly cartilage with small amount of immature bone
7	Equal mixture of cartilage and immature bone
8	Predominantly immature bone with small amount of cartilage
9	Union of fracture fragments by immature bone
10	Union of fracture fragments by mature bone