Abstract:[Objective] To investigate the clinical outcomes of implantation of vancomycin and calcium sulfate composite in the treatment of osteomyelitis secondary to open reduction and internal fixation (ORIF) of tibial plateau fracture. [Methods] A retrospective study was conducted on 37 patients who suffered from osteomyelitis after ORIF of tibial plateau fractures in our hospital from March 2014 to April 2022. All patients underwent debridement and implantation of vancomycin and calcium sulfate composite. The clinical and laboratory documents were evaluated. [Results] All 37 patients underwent successful surgery, with an average surgical time of (113.1±39.5) min and an average intraoperative blood loss of (156.8±78.3) mL, and were followed up for (38.3±22.8) months in a mean. Two patients had recurrent infection after surgery, which was controlled by revision of debridement and implantation of vancomycin calcium sulfate composite. All patients got bony healing in a mean of (7.9±2.9) months. With time that before operation, at discharge and the latest follow-up, the range of motion (ROM) of the knee [(39.4±7.3)°, (55.4±7.3)°, (106.1±17.3)°, P<0.001] and KSS clinical score [(19.1±3.9), (30.0±2.7), (80.8±5.0), P<0.001]、KSS functional score [(19.9±14.7), (38.8±4.9), (85.7±5.1), P<0.001]、HHS score [(31.8±6.4), (40.0±5.4), (73.8±9.1), P<0.001] were significantly increased. Regarding laboratory test, the CRP, WBC, and ESR significantly declined at discharge and the latest followup compared with those preoperatively, which returned to be normal in (5.4±2.5) weeks after the operation on an average. [Conclusion] According to the infection and fracture healing situation, debridement with retaining or removing the internal fixation by alternation of external fixator, and implantation of vancomycin-calcium sulfate composite in a timely manner are a reliable method for treating infection after internal fixation of tibial plateau fractures. It can effectively control infection and promote functional recovery.