Histomorphologic Assessment of Osteoregeneration in a Rabbit Femur Model With Xenograft, Bone Morphogenetic Protein-2, Platelet-Rich Plasma, and Denosumab.

BACKGROUND

This study investigated whether the combination of thermally processed bone xenograft (XG) and recombinant human bone morphogenetic protein-2 (rhBMP-2) with platelet-rich plasma (PRP) or Prolia (denosumab) can enhance bone regeneration in a rabbit femoral bone defect model.

METHODS

Seventy-two rabbits with created femoral bone defects (5 mm) were divided into 4 groups: (1) XG + rhBMP-2 + Prolia; (2) XG + rhBMP-2 + PRP; (3) XG + rhBMP-2; and (4) XG. At 14, 30, and 60 days after implantation, samples were prepared for histological and histomorphometric analysis.

RESULTS

Histomorphometrically, on day 30, there were no statistically significant differences between groups regarding the amount of newly formed bone (P = 0.2231), but a reduction in residual graft in the intramedullary space was observed in the PRP group. On day 60, more intense formation of new bone with reduced intragroup variation in the amount of newly formed bone was found in the XG + rhBMP-2 + PRP group (P < 0.001). At day 60, XG + rhBMP-2 + Prolia showed no cortical bone increase because of concurrent resorption.

CONCLUSIONS

Combined therapy using thermally processed bone graft, rhBMP-2, and PRP improves bone healing in femoral defects in rabbits.