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Objective:To compare the clinical results of balloon percutaneous kyphoplasty(PKP)and "Sky-bone expander" PKP.Method:From October 2004 to February 2006,25 cases(57 vertebrae) balloon PKP and 24 cases(29 vertebrae) "Sky-bone expander" PKP procedures were performed.The operation time,bleeding volume,cement injected volume were recorded during operation.The patients pain relief and functional activities recovery were evaluated after operation.The distribution of the cement and the restoration of vertebral height were also observed post-operation.All these patients were followed-up by telephone or clinic consults after discharged.