RESUMO
BACKGROUND: Percutaneous vertebroplasty (PVP) has been proved to be effective for osteoporotic vertebral compression fractures (OVCF); however, bone cement leakage-related complications occur frequently. OBJECTIVE: To systematically evaluate the safety and complications of PVP with high-viscosity and low-viscosity bone cement in the treatment of OVCF. METHODS: We performed a systematic search by computer in PubMed, EMBASE, Cochrane Library (December, 2016) and CNKI, CBM, VIP and WanFang databases from January, 2000 to December, 2016; meanwhile, the relevant Chinese and English orthopedic journals were retrieved manually. Randomized controlled trials (RCTs) concerning the use of high-viscosity and low-viscosity bone cement in the PVP for OVCF were collected and systematically reviewed using the method recommended by the Cochrane Collaboration. The Meta-analysis was performed by using the RevMan5.2. RESULTS AND CONCLUSION: Six relevant RCTs were included, involving 554 patients (high-viscosity bone cement was used in 278 cases and low-viscosity bone cement in 276 cases). Meta-analysis results showed that postoperative pain symptoms were alleviated in all the 554 cases, and there was no significant difference in the amount of adjacent vertebral fractures between two approaches (P > 0.05). However, there was a significant difference in the visual analog scale score, Oswestry disability index value, Cobb angle, and bone cement leakage rate between high-viscosity and low-viscosity cement groups (P < 0.05). To conclude, PVP with either high-viscosity or low-viscosity bone cement can relieve pain rapidly in OVCF patients, and both approaches are safe and effective. However, high-viscosity bone cement has a lower cement leakage rate and better outcomes in visual analog scale score, Oswestry disability index, Cobb angle and cement leakage prevention as compared with low-viscosity bone cement.
RESUMO
5' and 3' flanking region of ovine BLG were amplified from sheep genomic DNA according to the published whole sequence of ovine BLG and cloned to pGEM-T vector correspondently. By partially sequencing, the sequences of BLG 5' and 3' flanking were the same as that of publication completely. The recombinant structure used to direct exogenous gene especially to express in mammary gland was constructed by joining 4.2 kb 5' flanking with 2.1 kb 3' flanking. In order to assess the efficiency of BLG regulatory elements, green fluorescent protein (GFP) gene as a reporter was fused with BLG construct and transfected the mammary epithelial cells (TD47). Through observation under UV microscope and detection by fluorometer, it is demonstrated that the GFP has been successfully expressed in TD47 cell line. By virtue of direct observation and quantitative analysis, the BLG-GFP construct can be served as a model for the quick assessment of mammary gland expression construct.