Abstract:Objective To analyze the predictive value of the expressions of microRNA-206, microRNA-29b and microRNA-133a for the delayed union of fracture, and so as to provide evidence for clinical practice.Methods The 123 patients with delayed union of fracture treated in Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital from January 2020 to December 2020 were selected as the observation group, and 100 patients with normal fracture healing in the hospital were selected as the control group. The levels of microRNA-206, microRNA-29b and microRNA-133a were detected by quantitative real-time polymerase chain reaction. The receiver operating characteristic (ROC) curve was plotted and the predictive values of each indicator alone and the combined detection of these indicators were analyzed.Results The serum levels of microRNA-206, microRNA-29b and microRNA-133a in the observation group were higher than those in the control group (P < 0.05). The accuracy of microRNA-206, microRNA-29b and microRNA-133a in predicting the delayed union of fracture was 82.79%, 83.90% and 86.67%, lower than that of the combined detection of these indicators (96.72%). The sensitivity and specificity of the combined detection of microRNA-206, microRNA-29b and microRNA-133a in predicting the delayed union of fracture were 95.94% (95% CI: 0.922, 0.986) and 96.00% (95% CI: 0.937, 0.993), which were both higher than those of these indicators alone.Conclusions The serum levels of microRNA-206, microRNA-29b and microRNA-133a are higher in patients with the delayed union of fracture. The combined detection of these indicators effectively predicts the occurrence of delayed union in fracture patients, which is of value for further clinical practice.