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To compare the effectiveness of calcium phosphate cement (CPC) loaded with recombinant human bone morphogenetic protein 2 (rhBMP-2) combined with CPC loaded with antibiotic versus CPC loaded with antibiotic alone in one stage for chronic osteomyelitis with bone defect. A single-blind prospective randomized controlled clinical trial was conducted. Between April 2018 and April 2019, 80 patients of chronic osteomyelitis with bone defect in accordance with the random number table were randomly divided into two groups, 40 in the trial group