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Objective  To evaluate the therapeutic effect of platelet lysate (PL)/vancomycin/nano-hydroxyapatite sustained-release material on treating staphylococcus aureus-induced infectious bone defects.    Methods  40 New Zealand white rabbits were inoculated with staphylococcus aureus to construct the chronic tibial infectious bone defect model. After incision, debridement and washing, control group 1 was not given any filling, control group 2 was filled with PL/nano-hydroxyapatite sustained release material, control group 3 was filled with vancomycin/ nano-hydroxyapatite sustained release material, and the treatment group was filled with PL/vancomycin/nano-hydroxyapatite sustained-release material. Afterwards, the drug release profiles were determined in vitro and in vivo. Then, X-rays and bone specimens were used to evaluate the efficacy of the treatments.    Results  TGF-β and PDGF were effectively released for 28 days in vitro. In addition, results of the inhibition zone experiment of the composite material proved that vancomycin had favorable antibacterial activity, which effectively suppressed bacteria for as long as 43 days, thus achieving the sustained-release antibacterial effect. The drug release profiles in vitro also demonstrated that the vancomycin concentration within the lesion region was the highest in composite material, and the infection in experimental rabbits was markedly alleviated. The original backbone deformity regained the normal shape, the normal bone marrow structure began to recover 6 weeks later, and the nano-hydroxyapatite transformed into the trabecula structure. By contrast, the inflammation in the control group still existed, with no obvious new bone formation.    Conclusion  The PL/vancomycin/nano-hydroxyapatite sustained-release material effectively treats chronic infectious bone defects.

PL/Vancomycin/Nano-hydroxyapatite Sustained-release Material to Treat Infectious Bone Defect