We evaluated the bone-forming potential of a mixture of atelocollagen and bone marrow aspirate concentrate which was transplanted into bone defects. Radial shaft defects of about 10 mm in size were created in 30 New Zealand white rabbits. Ten rabbits in the control group were not treated further, 10 rabbits in the first experimental group (E1) received an atelocollagen injection, and 10 rabbits in the second experimental group (E2) received an injection of a mixture of atelocollagen and bone marrow aspirate concentrate. The groups were compared radiologically at 8 weeks. Osteogenesis in group E2 progressed more rapidly than that in the other groups, and osteogenesis in group E1 progressed faster than that in the control group. Thus, the administration of a mixture of atelocollagen and bone marrow aspirate concentrate in bone defects was found to enhance bone defect healing.

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