Bony bridging of the fracture callus.

Bony bridging of the fracture callus evaluated at 4 locations in the fracture callus: anterior and posterior callus peripherally (periosteal callus) and in between the cortices (intracortical callus). The quality of bone bridging was described by a scoring system (4 =  complete bony bridging at all locations; 3 =  at 3 locations; at 2 locations; 1 =  at 1 location; 0 =  no bony bridging). The table displays the number of mice with a distinct bridging score within the groups. n = 4–7 mice per group.