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Background  Chronic post-traumatic and postoperative osteomyelitis is a refractory disease which results in significant morbidity and mortality. The effect of combination therapy with vancomycin-loaded calcium sulfate and vancomycin-loaded polymethyl methacrylate (PMMA) was unknown.    Methods  Fifty-one patients suffering from chronic post-traumatic or postoperative osteomyelitis of the lower extremities were included in the retrospective investigation. The patients were assigned to the study group of the combination therapy with antibiotic-loaded calcium sulfate and antibiotic-loaded PMMA or the control group of the antibiotic-loaded PMMA. Hematological parameters, eradication of infection, rate of infection recurrence and reoperation rate were evaluated during the follow-up.    Results  The cases were followed up for an average of 24 months (range, 15–48 months) after the first-stage surgical operation. In the study group, all the patients revealed complete calcium sulfate resorption at an average of 6 weeks (range, 30–60 days). In the study group, infection was primarily eradicated in 92.31% (24 of 26) of patients and re-operation rate of 7.69% (2 of 26) after the first-stage surgery. Two patients underwent further surgical operation in the study group. One case achieved infection eradication in the recurrent two cases, with a secondary infection eradication rate of 96.15% (25 of 26). There was no persistent infection in the study group. In the control group, infection was eradicated in 64.00% (16 of 25) of patients and re-operation rate was 36.00% (9 of 25) after the first-stage surgery. Nine patients in the control group underwent further surgical operation. Two case achieved infection eradication in these cases who suffered from persistent or recurrent infection, with a secondary infection eradication rate of 72.00% (18 of 25). There was more re-operation rate in the control group (PMMA group, 9 vs combination therapy group, 2;  P  = 0.034).    Conclusion  The combination therapy with vancomycin-loaded calcium sulfate and vancomycin-loaded PMMA possibly achieved more effective control of infection in the treatment of osteomyelitis through synergistic effect. The immediate structural stabilization and higher concentration of antibiotic at the local site of infection may be achieved through the combination of biodegradable and non-biodegradable devices in the treatment of chronic post-traumatic and postoperative osteomyelitis.  The study was retrospectively registered at 11/16/2016 (TRN: NCT02968693).

Combination therapy with vancomycin-loaded calcium sulfate and vancomycin-loaded PMMA in the treatment of chronic osteomyelitis