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Lateral radiographs of rat femurs show fracture healing for prednisolone and placebo groups at 10, 28, and 42 days after fracture with OP-1 in a collagen carrier applied to the fracture site and at 28 days for collagen only. No difference in calcified external fracture callus between prednisolone treatment and placebo groups was seen at any time. OP-1 = osteogenic protein 1.
