Role of Hsa-miR-122-3p in steroid-induced necrosis of femoral head. 
To explore the clinical correlation between the hsa-miR-122-3p expression in bone marrow mesenchymal stem cells (BMSCs) and steroid-induced necrosis of femoral head (SONFH).  A total of 62 SONFH patients were selected as the experimental group, while another 72 patients with femoral neck fracture (FNF) were selected as the control group.  The bone marrow was obtained from patients during operation and used to culture the BMSCs.  The expression of hsa-miR-122-3p in BMSCs was detected via real-time quantitative polymerase chain reaction (qPCR) in both groups.  The patients in experimental group were further divided into Ficat stage III group and stage IV group according to the Ficat stage, and the expression of hsa-miR-122-3p in BMSCs was also detected via qPCR in the two groups.  The expression level of hsa-miR-122-3p in SONFH group was significantly lower than that in FNF group, and the difference was statistically significant (p<0.05).  The expression level of hsa-miR-122-3p in Ficat stage IV group was significantly lower than that in stage III group (p<0.05).  We demonstrated that the expression of hsa-miR-122-3p in BMSCs declined in SONFH group, indicating that hsa-miR-122-3p may be involved in the regulation of the pathological process of SONFH, and the expression level of hsa-miR-122-3p in BMSCs may be correlated with the progression of SONFH.