Value of preoperative erythrocyte sedimentation rate, CRP and D-D levels in evaluating the prognosis of elderly patients after hip replacement

Objective: To analyze the clinical value of blood sedimentation rate, C-reactive protein (CRP) and D-dimer (D-D) expression levels in elderly patients before hip replacement for judging the prognosis after operation. Methods 88 patients who needed hip replacement in orthopaedic surgery of our hospital from January 2014 to December 2017 were selected as the research object. According to the prognosis of patients, they were divided into two groups. 42 patients with good prognosis were treated as observation group and 46 patients with poor prognosis were treated as control group. The ESR and CRP of the two groups were recorded and analyzed before and after operation. The expression level of D-D, perioperative changes, and the prognostic value of the area under the curve (AUC) were compared by drawing the patient's working characteristic curve (ROC curve). Results The expression levels of ESR, CRP and D-D in the observation group were significantly higher than those in the control group (P < 0.05). The expression levels of CRP in the observation group were significantly higher than those in the control group (P < 0.05). The expression levels of ESR and CRP in the observation group before discharge were significantly higher than those in the control group (P < 0.05). There was significant difference between the two groups (P < 0.05);the level of ESR expression before and 2 days after operation was significantly lower than that before discharge (P < 0.05);the level of ESR expression before operation was significantly lower than that 2 days after operation (P < 0.05);and the CRP and D-D table before operation were compared between the two groups (P < 0.05). The level of CRP and D-D expression in two groups was significantly higher than that before discharge (P < 0.05). In this study, two groups of patients were infected. The incidence of thrombosis in the observation group was higher than that in the control group, but the difference was not statistically significant (P > 0.05). The Harris score of the observation group was significantly higher than that of the control group (P < 0.05). Conclusion There are abnormal levels of ESR, CRP and D-D expression in elderly patients with hip replacement before operation, and they have certain clinical value in evaluating the prognosis of elderly patients after hip replacement.

Effects of Temperature and Alloying Elements on γ Phase Fraction of Grain-oriented Silicon Steel

The effects of temperature and alloying elements on γ phase fraction of grain-oriented silicon steel,which contained 2.97-3.42mass% Si and 0.028-0.058mass% C,were studied by microstructure observation and statistics.Furthermore,the quantitative relationships of temperature as well as C,Si,and Mn contents to γ phase fraction were obtained by numerical fitting.The experimental results show that γ phase fraction firstly increases with increasing temperature,reaches a maximum and then decreases in the temperature range of 900-1 250 ℃.The temperature corresponding to the maximum γ phase fraction is about 1 150-1 200℃.Meanwhile,the γ phase fractions in steels at the same temperature have some differences because of different contents of various alloying elements.The verification results show that the values of γ phase fractions to C,Si,and Mn contents at the specific temperatures,which were obtained by multiple linear regression method,agree well with the measured values.In addition,the values of γ phase fractions to C,Si,and Mn contents in the temperature range of 900-1 250℃,which were obtained by binomial regression method,agree with the measured values when the contents of Mn and soluble Al are not more than 0.320mass% and 0.034mass%,respectively.The obtained equations can carry out the approximate prediction of γ phase fractions of grain-oriented silicon steels during the hot rolling process.