Objective To explore the advantages of computer assisted total knee arthroplasty(TKA)by comparing the post-operative 1 year short term effect of the computer assisted TKA and the conventional TKA .Methods A total of 60 patients from September 2013 to September 2014 were randomly divided into two groups and performed TKA by adopting the computer-assisted technology and the conventional technology respectively .The KSS score ,WOMAC score ,Oxford score and long-leg weight-bearing X-ray before operation and at postoperative 1 year were performed for each case and the statistical analysis was conducted . Results All cases were followed up for an average of 12 months (12—14 months) .The mechanical limb axis in the navigation as-sisted group was —0 .033o± 1 .470o ,which in the traditional group was 0 .600o± 2 .989o(t= —1 .711 ,P<0 .05);the proportions of within 3o varus/valgus force lines were 86 .70% and 73 .30% respectively ,the KSS scores were 88 .80 ± 3 .71 and 82 .63 ± 4 .15;the postoperative WOMAC scores were 23 .57 ± 3 .64 and 30 .00 ± 4 .89 respectively ;the Oxford scores were 18 .53 ± 3 .66 and 21 .83 ± 3 .99 ,the differences between the two groups were statistically significant (P<0 .005) .Conclusion TKA by computer navigation guidance can obtain more accurate lower limb force lines ,moreover the navigation group has more advantages in the clinical rehabili-tation effect .

[Objective]To investigate the effect of injectable xuebijing on macrophage ofimervertebral disc hernial tissue.[Method]The pigs were used as animal models after surgery in the intervertebral disc.Macrophage in herniated disc tissue were observed with the immunohistochemical method after it was treated by injectable xuebijing.[Result]Macrophage were found in 11 of 16 herniated disc tissue in the model group,were found in 7 of 16 herniated disc tissue in the low dose xuebijing group,and were found in 6 of 16 herniated disc tissue in the high dose xuebijing group,compared to the model group,all P

Objective To investigate the genetic characteristic of whole-genome of influenza A/H3N2 viruses in severe acute respiratory infection cases in Beijing area.Methods From 2014 to 2016,the viral RNA was extracted from 32 strains isolated from SARI cases,then sequenced by Ion Torrent PGM Sequencer.The phylogeny and molecular features of whole-genome were analyzed by Mega and Consurf software.Results The HA gene of tested strains isolated in 2014-2015 influenza season belonged to lineage 3C.3a and 3C.2a,while those isolated in 2015-2016 influenza season belonged to cluster 3C.2a.Moreover,compared with the vaccine strains,7 variant amino acids of protein of HA1 were identified,and two of them were located in antigenic sites.All isolates were sensitive to neuraminidase inhibitors while showed resistance to blockers for M2 ion channel.Conclusion The phylogenetic features of isolates studied in this study are similar with that of current circulating strains.However,the difference between isolates and vaccines should not be overlooked.

Objective To study the impacts of alcohol dependence on the anticonvulsant effect of diazepam. Meth?ods Kunming mice (n=36) were divided into 3 groups (n=12 in each group), Alcohol Dependence Group(A group), Diaze?pam Group(D group)and Normal Saline Group(N group). A group received an intraperitoneal injection with a 0.2 mL dose of 0.8%alcohol in NS (normal saline) , while both D and N group received an injection with a 0.2 mL dose of NS without alco?hol , twice a day. Mice’s autonomic activities were monitored every day. After 7 days, the electroconvulsive experiment was performed. Both A and D group were given a weight-based dose of 0.05 mL/10 g of 0.05%diazepam via intraperitoneal injec? tion, while N group was given a 0.05 mL/10 g dose of NS. Before administration and after 15, 30, 60 min of administration, the convulsion threshold of each group was measured. Results The count of autonomic activity of mice in A group was less than that of mice in D and N group during the 2nd day to 6th day(P<0.05). On the 1st and 7th day, the difference of the count of autonomic activity of mice between A group and the other two groups was not statistically significant(P>0.05). The convulsion threshold of mice in A group was higher than that of mice in D and N group before administration(P<0.05). Af?ter administration, the convulsion threshold of mice in N group didn’t show statistically significant difference from that of mice before administration(P>0.05). After 15 min of administration, the convulsion threshold of mice in D group was high?er than that of mice in A and N group(P<0.05), while the convulsion threshold of mice in A group was higher than that of mice in N group(P<0.05). After 30 min and 60 min of administration, both the convulsion thresholds of mice in A and D group were higher than that of mice in N group(P<0.05). However, at this point, the difference of the convulsion thresholds of mice between A and D group was not statistically significant(P>0.05). Conclusion Alcohol dependence has anticon?vulsant effect. Alcohol dependence weakens the anticonvulsant effect of diazepam.

Objective To explore the relationship between superantigen and M protein gene (emm)-types genes of Group A Streptococcus pyogenes (GAS) isolated from patients with scarlet fever in Beijing from May 2012 to July 2013 .Methods GAS was isolated from specimens of patients with scarlet fever . Superantigen genes (speA ,speB ,speC ,speF ,speG ,speH ,speI ,speJ ,speL ,speK ,speM ,ssa ,and smeZ) ,and emm gene were amplified by polymerase chain reaction .Rate and proportion were compared by chi-square test .Results Of the 423 GAS strains isolated from patients with scarlet fever from 2012 to 2013 ,most of the isolates possessed speB (97 .6% ) ,speC (99 .8% ) ,speF (98 .3% ) ,speG (99 .8% ) , smeZ (94 .1% ) and ssa (88 .4% ) ,and some of them possessed speH (54 .6% ) ,speI (53 .4% ) ,speA (45 .2% ) and speJ (43 .5% ) ,but very few isolates possessed speK (2 .4% ) ,speL (1 .4% ) and speM (1 .7% ) .Type emm12 (59 .5% ) and type emm1 (37 .4% ) were the main types of GAS .Most of the emm12-type isolates possessed speH (84 .8% ) and speI (84 .0% ) compared with only 4 .0% of speH and 3 .4% of speI in type emm1 .Most of type emm1 possessed speA (95 .3% ) and speJ gene (94 .6% ) compared with only 17 .3% of speA and 14 .8% of speJ in type emm12 .The superantigen genes profiles were significant different between emm 1-type and emm 12-type isolates (P< 0 .05) .Conclusion Type emm1 and type emm12 are epidemic strains in patients with scarlet fever from 2012 to 2013 in Beijing ,and emm gene-types are associated with superantigen genes profiles .

Inhibitory cells derived from bone marrow are a kind of inhibitory cells derived from bone marrow.These cells are not only related to tumor growth,but also participate in the inflammatory immune process.Therefore,we established a rat model of chronic osteomyelitis,and used gemcitabine to inhibit the cell growth ratio of MDSCs.We detected the ratio of MDSCs in bone marrow and spleen of rats by flow cytometry and immunofluorescence,detected the changes of inflammatory factors in peripheral blood by ELISA,and analyzed the inflammatory factors(TNF-α,PCT,IL-4,IL-10,IL-11)in peripheral blood of normal rats,osteomyelitis rats and rats after gemcitabine inhibition.The results showed that the proportion of MDSCs cells in bone marrow and spleen of osteomyelitis model rats was increased,but it was significantly decreased in gemcitabine group(P<0.05).Levels of inflammatory factors(TNF-α,PCT,IL-4,IL-10,IL-17,IFN-γ,TGF-β)were positively correlated with the change of MDSCs cell proportion(P<0.05).From the results,it can be inferred that the change of the proportion of MDSCs cells in rat osteomyelitis is positively related to the inflammatory factors,and gemcitabine can reduce inflammatory factors by inhibiting MDSCs.

BACKGROUND:Osteoporosis is a disease in which bone density and structure are destroyed and fractures are caused by increased bone fragility,leading to high clinical disability and mortality rates. OBJECTIVE:To review the research progress in the role of bone immunity in physiological and pathological processes related to bone metabolism,providing ideas for the research and clinical application of bone immunity in bone diseases. METHODS:The first author searched PubMed and CNKI databases in November 2022 for relevant literature using the keywords of"osteoimmunology,immuno-skeletal interface,bone metabolism,skeletal metabolism,lymphocyte,immune factor"in English and Chinese,respectively.The time range of retrieval was mainly from January 2010 to November 2022,and a small number of classical long-term literatures were included.After reading the topic and abstract for preliminary screening and excluding repetitive studies,low-quality journals and unrelated literature,81 documents were finally included for review. RESULTS AND CONCLUSION:Osteoimmunology refers to that bone and immune cells share the same microenvironment and interact with each other to jointly perform the"bone immune system,"which includes all cells in the bone marrow.Immuno-skeletal interface has protective effects on bone under physiological conditions,but it may lead to bone destruction under pathological conditions.Osteoprotegerin is mainly derived from B cells and can inhibit osteoclast metabolism.However,when the body is in an inflammatory state,T cells and B cells work together to promote bone resorption.In addition,interleukin-1,interleukin-6 and tumor necrosis factor-α regulate the expression of receptor activator of nuclear factor-κB ligand in vivo and affect bone metabolism.In most clinical diseases(such as rheumatoid arthritis,estrogen deficiency,HIV infection,and hyperparathyroidism),the immuno-skeletal interface interacts with the bone immune system,resulting in the regulation of bone metabolism.In terms of clinical prospect,the interaction between bone immunity and bone metabolism should be studied in order to propose new strategies for therapeutic intervention to reduce the risk of fracture.

BACKGROUND: Meshes play a crucial role in hernia repair. However, the displacement of mesh inevitably leads to various associated complications. This process is difficult to be traced by conventional imaging means. The purpose of this study is to create a contrast-enhanced material with high-density property that can be detected by computed tomography (CT). METHODS: The contrast-enhanced monofilament was manufactured from barium sulfate nanoparticles and medical polypropylene (PP/Ba). To characterize the composite, stress tensile tests and scanning electron microscopy (SEM) was performed. Toxicity and biocompatibility of PP/Ba materials was verified by in vitro cellular assays. Meanwhile, the inflammatory response was tested by protein adsorption assay. In addition, an animal model was established to demonstrate the long-term radiographic effect of the composite material in vivo. Subsequent pathological tests confirmed its in vivo compatibility. RESULTS: The SEM revealed that the main component of the monofilament is carbon. In vitro cell experiments demonstrated that novel material does not affect cell activity and proliferation. Protein adsorption assays indicated that the contrast-enhanced material does not cause additional inflammatory responses. In addition, in vivo experiments illustrated that PP/Ba mesh can be detected by CT and has good in vivo compatibility. CONCLUSION These results highlight the excellent biocompatibility of the contrast-enhanced material, which is suitable for human abdominal wall tissue engineering.

Objective:To clarify the M protein ( emm gene) types and drug susceptibility characteristic variations of Group A Streptococcus (GAS) in children in Beijing. Methods:The GAS strains isolated from throat swab samples of children diagnosed with scarlet fever and pharyngeal infection in scarlet fever etiology surveillance sentinel hospitals in 16 districts of Beijing in 2018, 2019 and 2021 were analyzed retrospectively.PCR amplification and sequencing were used for emm genotyping, and the minimum inhibitory concentrations (MIC) of 10 antibiotics were determined by the broth microdilution method.The data were analyzed using χ2 test and Fisher′ s exact method between groups. Results:A total of 557 GAS strains were collected, and 11 emm genotypes ( emm1, emm3, emm4, emm6, emm11, emm12, emm22, emm75, emm89, emm128, and emm212) were detected.Of 557 strains, 238 trains were of emm1 type (42.73%), 271 strains were of emm12 type (48.65%) and 48 strains were of other emm types (8.62%). The detection rates of emm1, emm12 and other emm type genes in 2018, 2019, and 2021 were [37.50% (105/280 strains), 57.14% (160/280 strains), 5.36% (15/280 strains)], [49.05% (129/263 strains), 39.54% (104/263 strains), 11.41% (30/263 strains)], and [28.57% (4/14 strains), 50.00% (7/14 strains), 21.43% (3/14 strains)], respectively.In children infected with emm12 in 2018 and 2019, there were more children under 6 years old than children over 6 years old (62.50% vs.46.88%, 46.36% vs.30.36%) (χ 2=7.182, 6.973; all P<0.05). Drug susceptibility testing results suggested that 225 randomly selected GAS strains were all 100.00% sensitive to 7 antibiotics including Penicillin, Levofloxacin, Meropenem, Linezolid, Cefotaxime, Cefepime and Vancomycin.The rates of resistance to Erythromycin, Tetracycline and Clindamycin were [88.57% (93/105 strains), 87.62% (92/105 strains), 86.67% (91/105 strains)], and [94.34% (100/106 strains), 94.34% (100/106 strains), 87.74% (93/106 strains)] in 2018 and 2019, respectively.The test strains were 100.00% (14/14 strains) resistant to the above 3 antibiotics in 2021.MIC 50 and MIC 90 values of Penicillin in 2018, 2019, and 2021 were (0.03 mg/L, 0.03 mg/L), (0.03 mg/L, 0.06 mg/L), and (0.06 mg/L, 0.06 mg/L), respectively.Among 225 GAS strains, 207 strains had drug resistance and were resistant to more than one drug.Specifically, 94.69% (196/207 strains) were resistant to Erythromycin, Tetracycline and Clindamycin.About 4.35% (9/207 strains) were resistant to both Erythromycin and Clindamycin.A total of 0.97% (2/207 strains) were resistant to Erythromycin and Tetracycline. Conclusions:The emm genotypes of GAS in children in Beijing are diverse in 2018, 2019 and 2021.The dominant genotypes are emm12 and emm1, and emm12 is the main epidemiological type.GAS strains maintain highly resistant to Erythromycin, Clindamycin and Tetracycline, and sensitive to Penicillin and other antibiotics.However, MIC 50 and MIC 90 of Penicillin shows an ascending trend.

Objective:To investigate the phylogenetic and antigenic characteristics of hemagglutinin (HA) gene of influenza B/Victoria lineage (BV) viruses in Beijing during the 2021-2022 influenza surveillance season, and to analyze whether the circulating BV viruses match the vaccine strain.Methods:Pharyngeal swab specimens from influenza like-illness (ILI) cases in the 2021-2022 influenza surveillance season were collected from surveillance network labs in Beijing and cultured in MDCK cells and chicken embryo to isolate BV viruses. Nucleic acids of the viruses were extracted, and the HA gene was amplified and sequenced. The nucleotide and amino acid sequence identity of the HA gene was analyzed using MEGA5.0 software. A phylogenetic tree of HA gene was constructed using the maximum likelihood method. The N-glycosylation sites in HA were predicted online. Three-dimensional structure of HA was constructed using SWISS-MODEL homologous modeling. Hemagglutination inhibition (HI) test was performed to analyze the antigenicity of BV viruses.Results:A total of 402 BV viruses were collected and 58 strains with full-length HA gene sequences were chosen for further analysis. Compared with the HA gene of this year′s vaccine strain (B/Washington/02/2019), there were 27 amino acid mutations, 11 of which were located in four different antigenic determinants. The phylogenetic analysis revealed that three subgroups of 1A.3, 1A.3a1, and 1A.3a2 co-circulated in Beijing with 54 strains (54/58, 93.10%) clustered to the Clade 1A.3a2, two strains (2/58, 3.45%) clustered to the Clade 1A.3a1, and two strains (2/58, 3.45%) in the same subgroup (Clade 1A.3) as the vaccine component BV strain in 2021-2022. Compared with the vaccine strain (B/Washington/02/2019), two BV strains had an additional N-glycosylation site at residue 197, while the other 56 strains showed no change in N-glycosylation sites. Antigenic analysis showed that 35 BV strains (35/58, 60.34%) were antigenically similar to the vaccine strain and 23 strains (23/58, 39.66%) were low-response strains.Conclusions:Three subgroups of BV viruses co-circulated in Beijing during the 2021-2022 influenza surveillance season. The predominant subgroup was Clade 1A.3a2 (93.10%), showing a certain genetic distance with the vaccine strain (B/Washington/02/2019). Nearly 40% (39.66%) of the viruses were low-response strains. This study indicated that continuous monitoring of the variations of influenza epidemic strains and timely providing laboratory basis for screening vaccine component strains were the basic technical guarantee for coping with influenza pandemic.