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BACKGROUND: With the increasing number of patients undergoing knee arthroplasty in China, the complications caused by the mismatch of prosthesis with anatomical parameters arouse extensive attentions.OBJECTIVE: To measure the anatomical parameters of the knee joints in healthy Zhuang ethnic group from Guangxi Zhuang Autonomous Region, China, using three-dimensional (3D) reconstruction technology, thus providing reference for the design and placement of the hip prosthesis.METHODS: Sixty-eight individuals, including 30 females and 38 males, were selected from 217 healthy people undergoing CT examination. All data were imported into Mimics 15.0 software used for 3D reconstruction, and then the knee parameters were then measured and analyzed.RESULTS AND CONCLUSION: There was no significant difference in the parameters of the bilateral femur and tibia (P > 0.05). The femoral parameters had significant differences between genders (P 0.05), while there were significant differences in the width of medial/lateral tibial platform, and sagittal length of medial tibial platform between genders (P < 0.05). The sagittal length of medial femoral condyle was negatively correlated with age, and all femoral parameters were positively correlated with height; while only the width of medial and lateral tibial platform were positively correlated with height. To conclude, 3D reconstruction technology is available for research on the morphology of the knee joint in the Zhuang ethnic group from Guangxi Zhuang Autonomous Region, which provides references for prosthesis design and research appropriate for the Zhuang ethnic group.
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BACKGROUND:Previous studies have confirmed that ethanol can promote adipogenic differentiation of bone marrow mesenchymal stem cells (BMSCs), and up-regulate the expression of PPARγ and aP2 in the tumor necrosis factor α (TNF-α) signaling pathway. As a member of the ZIP protein family, Zrt/Irt-like protein 1 (ZIP1) is closely related to bone metabolism and osteogenic differentiation.OBJECTIVE:To study the effect of BMSCs transfected by ZIP1 on TNF-α signaling pathway in the process of adipogenic differentiation.METHODS:The BMSCs from rabbits were isolated and cultured under different concentrations of alcohol (0.03, 0.09,0.15, 0.21 mol/L), followed by transfection by ZIP1 siRNA and ZIP1 expression vector.RESULTS AND CONCLUSION:After culture in alcohol, the expression levels of aP2 and PPARγ proteins were both significantly increased (P < 0.05), and the level of triglyceride was increased in all alcohol groups except for 0.03 mol/L alcohol group (P < 0.05). After siRNA transfection, the expression levels of aP2 and PPARγ as well as the level of triglyceride were increased significantly in all the alcohol groups (P < 0.05); however, ZIP1 transfection decreased the expression levels of aP2 and PPARγ proteins (P < 0.05). To conclude, ZIP1 siRNA could promote the adipogenic differentiation of BMSCs through the activation of TNF-α signaling pathway.
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BACKGROUND:Studies have shown that human cartilage glycoprotein-39 has a certain relationship to articular cartilage degeneration and repair, but the mechanism of action is not very clear. OBJECTIVE:To investigate the effect of human cartilage glycoprotein-39 on chondrogenesis of precartilaginous stem cels. METHODS: Precartilaginous stem cels were isolated from the adult articular cartilage. Cels which could express CD105 and CD166 were detected using flow cytometry folowed by isolation and purification. Isolated precartilaginous stem cels werecultured using monolayer method, and then, passage 2 cels were cultured in the medium containing human cartilage glycoprotein-39 and normal chondrogenic medium for 14 days, respectively. Immunohistochemical staining was used to observe expression of type II colagen and gross observation was done for evaluation of cartilage formation. RESULTS AND CONCLUSION:The precartilaginous stem cels isolated from the adult articular cartilage could express CD105 and CD166. After induction, differentiated precartilaginous stem cels gradualy gathered and formed nudes. The induced cels were positive for type II colagen; after induction by human cartilage glycoprotein-39, the nodules became larger and the expression of type II colagen was increased. These findings indicate that precartilaginous stem cels with chondrogenic ability can be isolated from the adult articular cartilage, and can be induced to differentiate into chondrocytes, in which human cartilage glycoprotein-39 plays an important role.
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BACKGROUND:Drainage has been applied as a routine to hip and knee replacement surgery. However, as a potential channel, drainage could become a portal for bacteria and other pathogens to invade the joint cavity. OBJECTIVE:To evaluate the clinical significance and safety of drainage in total knee arthroplasty. METHODS:The 80 patients were prospectively randomized into two groups:Group 1 included 38 patients with wound drainage;Group 2 included 42 patients without any drainage. According to a formula calculation, blood loss, the number of subjects requiring blood transfusion, volume of blood transfusion, complications and the recovery of function after total knee arthroplasty were statistical y analyzed. RESULTS AND CONCLUSION:The subjects were fol owed up for 2 years after discharge. Two patients lost to fol ow up in the non-drainage group. 78 patients were involved in the result analysis. The total blood loss, the number of subjects requiring blood transfusion and volume of blood transfusion were more in the drainage group than those in the non-drainage group after surgery. At 3 days after arthroplasty, active range of motion was larger in the drainage group than that in the non-drainage group. No significant differences in hemoglobin levels and Keen Society Score scores were detected after arthroplasty between the two groups. Results suggested that draining wil increase the blood loss and blood transfusion, but it may contribute to the early recovery of knee function. No significant differences in long-period Keen Society Score scores and postoperative complications were detectable between the two groups.
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Objective To study the effect of self-efficacy on learning effect of medical students.Methods Self-efficacy scores of the questionnaire to clinical medical students who practice in our hospital from September 2012 to April 2013 were measured.Students with score lower than the average were recruited into group A,and the others were recruited into group B.Then the scores of both-group students in the process of clinical practice,the theoretical knowledge,and triguaiacyl tests were gotten for statistical analysis.Results Group B (88.02 ± 3.902; 89.02 ± 3.902; 89.94 ± 3.794) were significantly better than group A (67.07 ± 5.131,66.02± 5.866,65.23 ±6.741) in the scores of the theory of knowledge,operation skills and triguaiacyl test.The correlation analysis showed that self-efficacy was positively related to these three aspects (P=0.032,0.024,0.001).Conclusion Clinical teachers should consciously improve students' self-efficacy in the process of their clinical practice,in order to improve the learning effect of the clinical medical students preferably.
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BACKGROUND:Alcohol has become pathogenic factors of avascular necrosis, and the alcohol induced abnormal lipid metabolism in bone marrow may be the important reason for the onset of avascular necrosis, but the mechanism is not clear yet. OBJECTIVE:To observe the changes of structure and function of fat cel s under the action of alcohol, in order to analyze the pathogenesis of alcoholic femoral head necrosis. METHODS:Primary adipocytes in vitro culture technique was used to obtain rabbit femoral head intramedul ary adipose tissue, and then the fat cel s were separated, and the phenotype was identified with oil red O staining. The passaged stable intramedul ary fat cel s were col ected. Coverslip was cut into 1 cm × 1 cm in size, and placed in the 24-wel culture plate before planting. The cel s were randomly divided into alcohol group and control group, 24 holes (each hole for a sample) in each group. The control group was without alcohol, while the alcohol group was added with 0.15 mol/L alcohol. At 4, 6, 8 and 10 days, the culture medium was replaced. Medium was changed and no longer adding alcohol, and then cultured for 10 days. When the culture terminated, the coverslip was removed for oil red O staining. Final y, the morphology and the number of the fat cel s were observed under light microscope. RESUTLS AND CONCLUSION:With time prolonging, the number of fat cel s in the alcohol group was significantly more than that in the control group (Pnumber of intramedul ary fat cel s in the control group was respectively (99.80±10.82), (0.40±94.71), (1 000.20± 41.85) and (1 059.80±26.79)/cm2, the number of fat cel s increased with the time of alcohol influence. Alcohol can promote the intramedul ary fat cel s to increase and enlarge, and this may be the main reason for femoral head necrosis, as long-term alcoholism can lead to bone marrow fat tissue increasing, intraosseous pressure increasing and perfusion reducing, thus resulting ischemia.