Objective To compare the clinical effects of arthroscopic wire fixation and cannulated screw fixation on the fracture of intercondylar eminence of the tibia. Methods Twenty-five patients with fracture of intercondylar eminence of the tibia were assigned to receive either arthroscopic wire fixation(group A,n=13) or cannulated screw fixation(group B,n=12). Clinical and radiologic follow-up was performed to observe the reduction and healing of fractures 6 weeks and 3,6,12,18 and 24 months after operation. At the last follow-up,knee joint function was assessed by anterior drawer test, Lachman test and Lysholm score. Results All patients underwent operation successfully. The operation time was(180.2±12.4) minutes and(170.3±11.7) minutes in group A and group B, respectively. The difference in operation time was not significant between the two groups(P0.05). After 24 months of clinical and radiologic follow-up, anteroposterior and lateral x-ray films showed that no fractures were displaced and bony union was achieved in all patients. At the last follow-up, both anterior drawer test and Lachman test showed negative results.Lysholm score was(95.2±1.9) and(94.8±1.6) in group A and group B,respectively.The activity of knee flexion and extension was(142.1±9.0)°and(138.6±12.1)°in group A and group B,respectively. Differences between the two groups were not statistically significant(P0.05). Conclusion Both arthroscopic wire fixation and cannulated screw fixation are effective for the fracture of intercondylar eminence of the tibia. However,arthroscopic wire fixation has the advantages with wide applicat-ion,simple operation,small trauma,reliable fixation,few complications,quick recovery,and convenient removal of internal fixator. Therefore,arthroscopic wire fixation is an ideal method for the treatment of the fracture of intercondylar eminence of the tibia.
A strains of bacterium that can degrade the xanthan gum has been isolated from soil.We analysed this xanthan-degrading bacterium in terms of the morphological characteristics,physiological and biochemical characteristics and 16S rDNA sequence.Combined with the strains of morphological characteristics,physiological and biochemical characteristics and system development analysis results,we confirmed the strains belonged to the genus Bacillus of Bacillaceae.This result layed a foundation to improve the ability of degradating strains xanthan gum for further development and the improvement of the strains of site-directed mutagenesis.
Objective To explore the surgical method of noncomminuted patellar fractures and the clinical efficacy of arthroscopic-assisted percutaneous cannulated screw and cerclage wire fixation.Methods Forty-two patients with noncomminuted patellar fractures were divided into two groups.Arthroscopic treatment group(n=22) received arthroscopic-assisted percutaneous cannulated screw and cerclage wire fixation.Traditional open reduction group(n=20) received open reduction and cannulated screw tension band fixation.Incision size,fracture healing time,complications(infection,activity limitation,and pain on walking) and functional recovery of knee joint were compared between the two groups.Results Patients were followed-up for an average of 20 months.Incision size,time to fracture healing and incidence of complications were,respectively,(6.4 ±1.4)cm,(9.7 ±1.2)weeks and 0.0% in arthroscopic treatment group,and(8.3±1.3) cm,(12.1±1.7)weeks and 25.0% in traditional open redu-ction group.The differences were statistically significant between the two groups(P 0.05).Lysholm score in arthroscopic treatment group(85.3±3.4) was not significantly different from that in traditional open reduction group(83.0±4.6)(P0.05).No obvious rough articular surface,delayed union and nonu-nion were observed by X-ray examination.Conclusion Arthroscopic-assisted percutaneous cannulated screw and cerclage wire fixation is effective for patellar fractures with advantages of minimal invasion and few complications.Furthermore,joint cavity flushing and injured tissue repair can be performed during fracture reduction.
Objective To observe the experiental effect of nonunion treatment with percutaneous autogenous concentrated bone marrow grafting. Methods 32 rabbits were used to make nonunion models,they were grouped randomly into two groups(Bone marrow stem cells group,Internal fixationand grafting group). Periodical standardized radiographs,histology and heal rate after 8weeks and 12weeks were perfoermed. Results The gap changes of bone union at 8weeks and 12weeks after treatment in group A and B,were not statically significant. Conclusion Percutaneous autogenous concentrated bone marrow of the rabbits can induce osteogenesis in bone nonunion,its efficacy appears to be related to the concentration of bone marrow stem cells in the graft.
Backup power switchover unit now is proverbially used in power system.Aiming at a 35kV transformer substation in actual operation mode,this paper discusses limitation of backup power switchover unit with external bridge operation mode,and puts forward how to exert effects of backup power switchover unit in power system failure by the way of poising load transfering operating manner and backup power switchover mode.
Objective To investigate the clinical effect of treatment of severely comminuted Pilon's frac-tures with limited internal fixations and external fixators.Methods Since 2006,15 cases of severely comminuted Pilon's fractureswith limited internal fixations and external fixators were treated.They were all treated by Kirss-chnerwires or screws together with external fixators.External fixator were removed at 2～3 months after operation.Results All cases were followed up after operation.The following observation time was 4～18 months,average 13 months.No infections of wound and incision,no skin necrosis complication was found.According to Mazur ankle joint scoring system,The results demonstrated 6 excellent,7 good,2 fair,the excellent and good rate was 81.3%.Conclusion Limited internal fixation and external fixator is one of the effective way of treatment of severely comminuted Pilon's fracture because it can immobilize the sections of fracture and avoid infection of soft tissue and nonunion of fracture.
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