Objective To assess the clinical effect and methods of posterior decompress and fixation for upper-middle thoracic fracture and dislocation. Methods Between September 2002 and September 2007,21 patients suffered from upper-middle thoracic fracture and dislocation were treated with posterior approach, which comprising 5 patients with compressed fracture,4 patients with burst fracture, 12 patients with fracture and dislocation. There were 12 cases companied by complete paraplegia, and 9 cases companied by incomplete paraplegia. All cases adapted to pedicle screw fixation system after decompression and reduction. Reduction or removal of fragments was done through posterior-lateral of the spinal canal for patients with fragments migrated into the spinal canal. The operation time,blood loss volume,preand postoperative transverse displacement degree and angle of the injured vertebra were recorded. The neurological function was assessed by Frankel criteria. Results The patients was followed up for (2.5 ± 0.5 ) years. The Frankel score increased from ( 1.0 ± 0.1 ) scores preoperatively to ( 1.3 ± 0.1 ) scores postoperatively. The incomplete paraplegia patients' score increased from (2.2 ± 0.2) scores preoperatively to (3.1± 0.2) scores postoperatively. The height of injured vertebral body, the interangle of vertebral body and spondylolistheses after operation increased comparing with those before operation(P ＜ 0.05 ). No implant loosening or breakage was found. Conclusions Severe spinal cord injury occurs in upper-middle thoracic fracture and dislocation.Unstable fracture should be treated with internal fixation and fusion in time. Decompression ought to be done in patients who suffering from incomplete paraplegia. Early operation takes advantages of immediate stability and a good improvement of the neurologic function.

Objective To compare the incidence of secondary surgical procedures after cervical disc arthroplasty vs anterior cervical discectomy with fusion in patients treated for symptomatic single level cervical spondylosis.Methods An online search of Pubmed, Medline, Ovid, Embase, Cochrane Library, CBM database, Wanfang data and VIP database were searched for prospective randomized controlled trial of cervical disc arthroplasty versus anterior cervical discectomy with fusion in incidence of secondary surgical procedures.Data were collected and extracted by two reviewers independently.Risk of bias was assessed using the criteria of Cochrane Reviews Handbook 5.1.0.Review Manager 5.2 software system was used to evaluate the data for Meta analysis.Results A total of 12 trials were included.Six of them were short-term follow up (two years).The 6 other trials were mid-and long-term follow up (mean 5.8 years).There are 4 trials with low risk of bias, 7 trials with moderate risk of bias, and 1 trial with high risk of bias.The results of meta-analysis showed there was no statistical difference in reoperation rate of adjacent level between the two groups at two years follow-up;however, the reoperation rate of non-fusion group was significantly lower in the non-fusion group compared with fusion group at mid-and long-term follow-up.The incidence of secondary surgical procedures at index level was higher in fusion group than in non-fusion group.No statistical difference was found between the two groups in using ‘ removal’ for secondary surgical procedure at two years follow-up;however, the rate of non-fusion group was significantly lower than fusion group at mid-and long-term follow-up.Conclusion Cervical disc arthroplasty was partly superior to anterior cervical discectomy with fusion in avoiding secondary surgical procedures of adjacent levels.However, non-fusion surgery doesn't have any advantages in short time (two years) follow up.Reducing the incidence of pseudarthrosis was an effective way to decrease the incidence of secondary surgery procedures in index level.

AIM:To investigate the role of high glucose in primary hepatocytes of mice fed with a high fat di-et.METHODS:Male C57BL/6J mice were fed a high fat (45%of calories) diet ad libitum for 6 weeks to induce hepatic steatosis.Primary hepatocytes were isolated from the mouse liver by the 2 step collagenase perfusion method .The cells were incubated in low glucose ( 5 mmol/L ) , low glucose plus mannitol ( 30 mmol/L ) , or high glucose ( 35 mmol/L ) DMEM medium for 12 h.The cell viability , apoptosis , mitochondrial membrane potential , and caspase enzymatic activities were measured.Furthermore, proteins related to the stress-sensitive signaling pathway of regulating high glucose-induced apoptosis in primary hepatocytes were determined by Western blotting .RESULTS:Incubation with 35 mmol/L glucose re-sulted in a significant decrease in cell viability and an increase in apoptosis , whereas mannitol had no significant effect on the cell viability or apoptosis .A progressive depolarization of the mitochondria , an increase in cytosol cytochrome C and a dramatic decrease in mitochondrial cytochrome C in high-glucose stressed hepatocytes were observed .The enzymatic activi-ties of caspase-9 and caspase-3, but not caspase-8, were significantly increased in high glucose-stressed hepatocytes ( P<0.05).High glucose treatment suppressed the expression of Bcl-2 and Bcl-xL, while it increased the expression of the pro-apoptotic factor Bax .CONCLUSION:High glucose stress reduces mitochondrial membrane potential , initiates mitochon-dria-mediated apoptotic pathways and promotes apoptosis of hepatocytes with steatosis .This may be an important pathologi-cal mechanism of hyperglycemia-induced progression of nonalcoholic fatty liver disease .

Objective:To study the expression and significance of sodium channel Nav1.6 in oral leukoplakia and squamous cell carcinoma.Methods:Immunohistochemistry and Western blot were used to detect the expression of Nav1.6 in 21 case of normal oral mucosa,32 of oral leukoplakia and 63 of oral squamous cell carcinoma(OSCC).Results:Immunohistochemical results showed that the positive rate of Nay1.6 in normal group,oral leukoplakia group and OSCC group was 6.25％,40％ and 76.74％ respectively.The expression of Nav1.6 was related to the differentiation of oral squamous cell carcinoma.Western blot results revealed that the content of Nav1.6 in normal oral mucosa,oral leukoplakia and OSCC was 0.469 ±0.015,0.545 ±0.016 and 0.848 ±0.020(P ＜0.05) respectively.Conclusion:Nay1.6 may play a role in the development of OSCC.

ObjectiveTo compare the incidence of C5 nerve palsy after laminoplasty and laminectomy with internal fixation for treating multilevel cervical spondylotic myelopathy (MCSM).MethodsFrom January 2005 to June 2010,68 patients with MCSM were treated with laminoplasty (27 patients,group A) or laminectomy with internal fixation(41 patients,group B).There were 21 males and 6 females in group A,aged 33-80 years(average,60.4 years),31 males and 10 females in group B,aged 22-77 years (average,58.7 years).All the patients were followed up for 12-48 months (average,22 months).In both groups,Cobb's method was applied to measure cervical lordotic angle,and Ishihara's method was conducted to measure cervical curvature index(CCI) before and after operation.The incidence of C5 nerve palsy was recorded and compared.Then we further compared preoperative and postoperative the cervical lordosis angle and CCI of 9 patients with C5 nerve palsy (group B1) and 32 patients without C5 nerve palsy (group B2) in group B.ResultsThe incidence of C5 nerve palsy in group A was 3.7％(1/27),while 22.0％(9/41) in group B (x2=4.32,P＜0.05).For all ten patients with C5 nerve palsy,the muscle strengths of paralyzed muscles were recovered to grade 4 or better after being treated with conservative treatment for an average of 14 months.The change rate of preoperative and postoperative CCI in group B1 was 38.07％±18.03％,while 22.81％±12.71％ in group B2.There was a statistical difference between group B1 and group B2 (t=2.88,P＜0.05).Conclusion Compared with laminoplasty,laminectomy with internal fixation has a higher incidence of C5 nerve palsy.The C5 nerve palsy may be associated with postoperative increase of cervical lordosis angle.Moreover,tethering of the C5 root may be one of its important pathomechanisms.

Objective To study the single nucleotide polymorphisms (SNPs) in IL-23R gene in Chinese Han population with ankylosing spondylitis (AS). Methods SNPs rs11209026, rs1343151, rs11209032 and another three SNPs near them based on their physical distances were genotyped by PCR-directed sequencing. Hardy-Weinberg equilibrium, genotypes and allele frequency analysis were analyzed by SPSS 13.0. Linkage disequilibrium and haplotype analysis were carried out by SHEsis software. Results The difference of genotypes of rs11209032 and the difference of genotypes and allele frequencies of rs6677188 between patients and controls were statistically significant (P＜O.01) ; The two SNPs rs11209032 and rs6677188 had strong linkage disequlibfium (D'=0.925, r2=0.561 ). Haplotype analysis had shown a higher proportion of GAC haplotype in patients and a higher proportion of GTC haplotype in controls. Conclusion These results suggest that IL-23R polymorphisms is associated with susceptibility to AS in Chinese Han population and IL-23R gene may be a susceptible gene of AS.

Objective To investigate the expression and significance of Smad4 in peripheral hepatocytes of lesions in mice with hepatic alveolar echinococcosis.Methods Eight mice in the test group were inoculated with alveolar echinococcosis and 8 mice in the control group were injected with normal saline.The expression of Smad4 protein in the hepatic tissue of the mice was detected by immunohistochemistry method,and the data were analyzed by chi-square test.The effect of alveolar echinocoeeosis on the expression of Smad4 protein was investigated.Results Smad4 was detected in cell nuclei and partly in the cytoplasm.Six months after the establishment of the mice model for alveolar echinococeosis,the expression of Smad4 in the hepatic tissue in the test group was significantly higher than in the control group(x2=19.869,P＜0.05).The number of Smad4 with positive expression in the hepatocytes in the test group was slightly higher than in the control group,and the expression intensity of Smad4 in the test group was greater than in the control group(x2=58.3 10,P＜0.05).Conclusions The increase of the expression of Smad4 protein in the periphery hepatocytes and tissues of hepatic alveolar echinococcosis lesions may play a role in hepatic cirrhosis and immune evasion.

Objective To evaluate the method of establishment of a minipig model of ischemic heart failure(HF) with acute myocardial infarction(AMI) by coronary balloon occlusion and coadministration of injecting of microthrombi and plastic microspheres.Methods A total of eighteen minipigs were selected.After coronary angiography,angioplasty balloons were placed in the mid-distal of left anterior descending(LAD).The balloon was inflated intermittently to occlude the LAD 3 times and then to occlude it continuously for 120 minutes.After the balloon was taken out,4F Judkins-type angiogrphic catheter was superelectively engaged in LAD and 3 mL intermixture of mierothrombi and plastic microspheres were injected at 10 minites interval until TIMI myocardial perfusion was grade<2 and left ventfieular end-diastolic pressure was maintained from 15 to 18 mmHg.Electrocardiogram(ECG),hemodynamic perameters,ultrasonic cardiogram,cTnI and CK-MB were measured.Myocardial infarction area was evaluated by histopathology.Results Fourteen days later,fifteen minipigs survived and fourteen satisfied the criteria(pulmonary capillary wedge pressure.PCWP>18 mmHg and eardio output (CO) decreased beyond 30% ). The changes of ECG, hemodynamic perameters, CKMB, cTnI and cardiac pathologic examination were in accordance with AMI. Conclusion A stable experimental method of establishment of minipig model of ischemic heart failure (HF) with acute myocardial infarction (AMI) by coronary balloon occlusion and coadministration of injecting of microthrombi and plastic mierospheres is succeded. This method has advantages such as closed chest, higher success rate and stability compared with the drug induced, taehycardia-pacing induced, coronary artery ligation induced or microsphere injection alone methods.

Objective: To isolate and identify the structures of triterpenoids from the extract of Acanthopanax sessiliflorus fruits. Methods:The chemical constituents were systematically isolated by column chromatography and liquid chromatography, and their struc-tures were determined by spectral data including 1 H-NMR, 13 C-NMR, HSQC and HMBC combined with ESI-MS. Results:Totally 8 trit-erpenoids compounds were isolated and identified from Acanthopanax sessiliflorus fruits, 22-α-hydroxychiisanogenin (1), chiisanogenin (2), 3-oxo-24-methylenecycloartan (3), mangiferonic acid (4), isomangiferolic acid (5), oleanolic acid (6), betulin (7) and betulin-ic acid (8). Conclusion:Compound 3, 4 and 5 are obtained from Acanthopanax genus for the first time.

Objective To investigate the mid-and long-term effects of metal-on-metal hip resurfacing arthroplasty (HRA),and to analyze its related factors.Methods A total of 64 patients (81 hips) who underwent metal-on-metal HRA from June 2005 to January 2013 were recruited in the present study.There were 35 males (44 hips) and 29 females (37 hips) with the mean age of 48.26±10.45 years (20-65 years),including 47 unilateral and 17 bilateral HRAs.The cohort consisted of osteoarthritis secondary to the developmental dysplasia of the hip (23 cases,29 hips),necrosis of the femoral head (19 cases,22 hips),osteoarthritis (8 cases,10 hips),rheumatoid arthritis (5 cases,9 hips),ankylosing spondylitis (6 cases,8 hips),pigmented villonodular synovitis (2 cases,2 hips) and Otto's disease (1 case,1 hip).During the follow-up duration,radiographic features,including acetabular inclination angle,stem-femoral shaft angle,component loosening,osteolysis,femoral neck narrowing and heterotopic ossification,were evaluated by hip X-rays in straight and froglike position.The size and type of pseudotumor were assessed by MRI and ultrasonography.Clinical efficacy was evaluated by Harris hip score and the University of California at Los Angeles (UCLA) hip score.Considering revision surgery as the end point,the component survivorship was calculated.Results The mean follow-up was 7.98±2.21 years,ranging from 5.0 to 12.8 years.The mean postoperative Harris hip score (92.01 ±5.69) was higher than the preoperative score (41.93 ±9.09).The mean postoperative UCLA pain,walking,function,activity scores (9.37±0.86,9.14± 1.01,8.77± 1.09,6.47± 1.27,respectively) were improved when compared with the preoperative UCLA scores (3.57± 1.23,5.99± 1.30,5.00± 1.01,3.84± 1.41,respectively).The postoperative flexion,abduction and adduction,medial and lateral rotation of the hip was larger than the preoperative ones.Complications occurred in 10 hips (12.3％,10/81).Seven patients (8 hips) experienced early and intermediate complications,including one intraoperative femoral nerve injury,one deep femoral artery and saphenous nerve injuries during the same surgery,one unexplained pain of hip,one femoral neck fracture,three hips of heterotopic ossification,and one pseudotumour.There were mid-and long-term complications in two hips,including one narrowing of the neck and one pseudotumour which was occurred at 9 years.There was one patient (2 hips) underwent revision surgery twice at 5 months and 9 years.The former cause of revision was femoral neck fracture and the latter one was pseudotumour.The Kaplan-Meier survivorship was 98.8％ at five years,and 95.0％ at ten years.Conclusion Patients who underwent metal-on-metal HRA could obtain good mid and long-term results.Pseudotumour and unexplained pain of the hip are critical factors which can affect the mid-and long-term results and survivorship of metal-on-metal HRA.