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The bending load at 1-mm middle-span deflection of the fusion mass of the BMP15 group was similar to that of autogenous bone graft control group. More than 15 μg/side of E-BMP-2 treatment could mechanically achieve lumbar spinal fusion as well as autogenous bone graft. The bending loads of the BMP50 and BMP150 were higher than that of the autogenous bone graft control group. Values are mean ± SD.
