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Background:Systemic administration ofbisphosphonates has shown promising results in the treatment ofosteonecrosis of the femoral head (ONFH).However,few studies have evaluated the efficacy of local zoledronate (ZOL) administration in the treatment of ONFH.The purpose of this study was to investigate whether local administration of bisphosphonate-soaked hydroxyapatite (HA) could improve bone healing in an experimental rabbit model of ONFH.Methods:This experimental study was conducted between October 2014 and June 2015.Forty-five rabbits underwent simulated ONFH surgery.Immediately following surgery,they were divided into three groups:model (untreated,n =15),HA (treated with HA alone,n =15),and HA + ZOL (treated with HA soaked in a low-dose ZOL solution,n =15).Histological,immunohistochemical,and quantitative analyses were performed to evaluate bone formation and resorption 2,4,and 8 weeks after surgery.Results:Gross bone matrix and hematopoietic tissue formation were observed in the HA + ZOL group 4 weeks after surgery.The immunohistochemical staining intensities for 5-bromodeoxyuridine,runt-related transcription factor 2,osteocalcin,osteopontin,and osteoprotegerin were significantly higher in the HA + ZOL group than that in the model (P ＜ 0.001,P ＜ 0.001,P ＜ 0.001,P ＜ 0.001,and P =0.018,respectively) and HA groups (P =0.003,P =0.049,P ＜ 0.00l,P =0.020,and P =0.019,respectively),whereas receptor activator of the nuclear factor-κB ligand staining intensity was significantly lower in the HA + ZOL group than that in the model and HA groups (P =0.029 and P =0.015,respectively) 4 weeks after surgery.No significant differences in bone formation or bone resorption marker expression were found between the three groups 2 or 8 weeks after surgery (P ＞ 0.05).Conclusions:Local administration of HA soaked in a low-dose ZOL solution increased new bone formation while inhibiting bone resorption in an animal model of ONFH,which might provide new evidence for joint-preserving surgery in the treatment of ONFH.