Histological and Radiographic Evaluations of Demineralized Bone Matrix and Coralline Hydroxyapatite in the Rabbit Tibia

Abstract

Complex fractures resulting in bone loss or impaired fracture healing remain problematic in trauma and orthopedic surgeries. Many bone graft substitutes have been developed and are commercially available. These products differ in their osteoconductive and osteoinductive properties. Differential enhancement of these properties may optimize the performance of these products for various orthopedic and craniofacial applications. The use of bone graft substitutes offers the ability to lessen the possible morbidity of the harvest site in autografts. The objective of the present study was to compare the ability of two bone graft substitutes, BioSet^® RT, an allograft demineralized bone matrix formulation, and ProOsteon^® 500R, a coralline hydroxyapatite, in a rabbit critical tibial defect model. BioSet^® RT and ProOsteon^® 500R were implanted into a unicortical proximal metaphyseal tibial defect and evaluated for new bone formation. Samples were analyzed radiographically and histologically at 1 day, 6 weeks, 12 weeks, and 24 weeks post surgery. Both materials were biocompatible and demonstrated significant bone growth and remodeling. At 12 weeks, the BioSet^® RT implanted sites demonstrated significantly more defect closure and bone remodeling as determined by radiographic analyses with 10 out of 14 defects being completely healed versus 1 out of 14 being completely healed in the ProOsteon^® 500R implanted sites. At 24 weeks, both materials demonstrated complete closure of the defect as determined histologically. There were no statistical differences in radiographic scores between the two implanted materials. However, there was an observable trend that the BioSet^® RT material generated higher histological and radiographic scores, although not statistically significant. This study provides evidence that both BioSet^® RT and ProOsteon^® 500R are biocompatible and able to induce new bone formation as measured in this rabbit model. In addition, this in vivo study demonstrates the ability of BioSet^® RT to induce new bone formation in a shorter timeframe than ProOsteon^® 500R.

Keywords

demineralized bone matrix histology radiography rabbit tibia bone defect.

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