Platelet-derived growth factor-BB (PDGF-BB) is a well characterized wound healing protein known to be chemotactic and mitogenic for cells of mesenchymal origin, including osteoblasts and chondrocytes. Biocompatible scaffolds, combined with growth factors such as PDGF-BB, have potential to stimulate regeneration and repair of osseous and cartilaginous tissues. The purpose of this study was to determine the efficacy and safety of recombinant human PDGF-BB (rhPDGF-BB) combined with a collagen implant to augment healing of osteochondral defects. A single osteochondral defect (8mm x 8mm) was created in the medial femoral condyle of 32 adult goats. Collagen implants(8.5mm x 8mm) hydrated with four doses of rhPDGF-BB (0g, 15g, 75g, 500g) were press-fit into the defect. Defects in four animals were left untreated. All goats were sacrificed 12 weeks postoperatively. Macroscopic evaluation and quantitative CT analyses were performed. Histologic sections were stained with Safranin O/Fast Green and assessed with a modified ODriscoll scoring scale for cartilage and bone repair. Significance was determined by One-Way ANOVA or nonparametric Kruskal-Wallis.Purpose
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