Objective: To investigate and analyze the biomechanics characteristics of different fixed materials and instruments in orthopedics and their application in patients so as to provide references for enhancing the effective application of fixed materials in orthopedics. Methods: 60 different fixed materials and instruments in orthopedics were divided into two groups (30 pieces in shape memory alloy group and 30 pieces in stainless steel group) according to their texture. The biomechanics performance of these materials were compared. At the same time, 60 patients received intra fixed surgery were selected and Logistics regression was implemented to analyze the effect factors of infection after fixed material was implanted in body. Finally, the relative ameliorative measures were formulated depended on the results of testing. Results: For biomechanics characteristics of fixed materials, memory alloy was significantly better than stainless steel. The stress shielding of fixed plate by using memory alloy was significantly better than that of stainless steel. The infection situations of 60 patients who received implanted instrument revealed that 30 cases were infection and 30 cases were not infection. After instruments were implanted, the effect factors of infection were analyzed and its results revealed that the standard degree of sterile operation, serious degree of admittance for instrument, the standard degree of sterilization for instrument and preparation degree of instrument were negative correlation with the infection situation after the instruments were implanted in body. Conclusion: The improvement of different fixed materials not only can enhance the resistance to corrosion for material and biocompatibility, but also should pay attention to sterilization of instrument, sterile operation, admittance situation of instrument and preparation for instrument so as to reduce infection rate after instrument is implanted in body and ensure the safety of orthopedic surgery.

Objective To investigate the clinical efficacy of simvastatin combined with ferulate in treatment of early diabetic nephropathy (DN).Methods 106 patients with DN were randomly divided into two groups by random number table,and each group had 53 cases.The control group was given simvastatin,while the observation group was given simvastatin combined with ferulate,and the clinical outcomes were compared between the two groups.Results The total effective rate of the observation group was 92.45％,which was significantly higher than 73.58％ of the control group(x2 =8.992,P ＜ 0.05) ; after treatment,the Upro,SCr,BUN and CRP levels of the observation group were (50.72 ± 7.74) mg/24h,(70.01 ± 8.56) μmol/L,(3.87 ± 0.54) mmol/L and (3.51 ± 0.63) mmol/L,which were significantly lower than (83.74 ± 7.92) mg/24h,(84.33 ± 9.01) μmol/L,(5.03 ± 0.62) mmol/L and (5.52 ± 0.61) mmol/L of the control group,the difference was statistically significant (t =7.73,6.59,8.62,9.30,all P ＜ 0.05).Conclusion Simvastatin combined with ferulate in treatment of early diabetic nephropathy (DN) has significant effect,and it can effectively improve the clinical symptoms and protect renal function,and it has better clinical value.