Neutrophil to lymphocyte ratio and fracture severity in young and middle-aged patients with tibial plateau fractures.

The neutrophil-to-lymphocyte ratio (NLR) has recently been found to be closely associated with the severity of trauma. This study aimed to analyze the correlation between the imaging severity of isolated tibial plateau fractures (TPFs) and the NLR in the blood. A total of 223 patients with isolated TPFs were enrolled in this retrospective study over five years. The data at hospital admission were extracted from an electronic database. Schatzker classification was performed according to the imaging data by two experienced orthopaedic surgeons. All patients were divided into two groups: group 1 included patients with mild-to-moderate fractures (Schatzker types I–IV), and group 2 included patients with severe fractures (Schatzker types V–VI). The NLR levels at hospital admission were statistically compared between the two groups. The blood NLR, hemoglobin level, red blood cell count, neutrophil count, platelet count, time from injury to admission, total protein, and Na+ levels were significantly different among the two groups. According to the receiver operating characteristic (ROC) curve, the cutoff for the NLR was 5.8. ROC curve analysis showed that the sensitivity of an NLR ≥ 5.8 to predict severe TPFs was 53.4%, and the specificity was 70.7%. In the multivariate analysis, NLR ≥ 5.8 and haemoglobin < lower limit appeared to be independent predictors of severe TPFs. Our study is the first to demonstrate that the NLR level appears to be a useful biomarker for predicting the severity of isolated TPFs in young and middle-aged adults.