BACKGROUND:Studies have shown that factors affecting the outcomes of anterior cruciate ligament reconstruction mainly depend on the position of bone tunnels. However, there stil exists certain controversy over the researches on the position of bone tunnels. OBJECTIVE:To investigate the clinical value of three-dimensional computed tomography on postoperative evaluation of bone tunnel after anterior cruciate ligament reconstruction under arthroscopic assistance. METHODS:Fifty-eight patients with anterior cruciate ligament injury who received the treatment from January 2014 to August 2014 underwent anterior cruciate ligament reconstruction under arthroscopic assistance. The femoral end was fixed using an Endobutton, and tibial end was fixed using absorbable interference screws. 58 knees from patients were scanned respectively by means of a dual-source CT scanner. A three-dimensional model of knee was rebuilt on a CT image post-processing workstation to reproduce the medial wal of the lateral femoral condyle and reconstruct single-bundle anterior cruciate ligament, tibial plateau and bone tunnel. The cases that had a Lysholm score≥ 80 points were included in the excelent and good group and those who had a Lysholm score < 80 points in the poor group. The relative position of the center point of the femoral and tibial bone tunnels were marked and measured and the position relation between the two center points was estimated. RESULTS AND CONCLUSION: Three-dimensional computed tomography reconstruction method clearly reflected the situation of bone tunnel and its entrance, fixtures and grafts after anterior cruciate ligament reconstruction. There was significant difference in the center point of femoral tunnel of the knee on the operated side between excelent and good group and poor group (P < 0.05). There was significant difference in the center point of the tibial tunnel between these two groups (P > 0.05). These results confirm that three-dimensional computed tomography can help to clearly reconstruct the images of bone tunnel and anterior cruciate ligament grafts after operation, which can be used clinicaly to assess the relationship between bone tunnel location and graft misshaping.

BACKGROUND:There is a controversy in the clinical anterior cruciate ligament reconstruction using autologous hamstring tendon or tendon alograft. OBJECTIVE:To compare the clinical results of anterior cruciate ligament reconstruction with tendon alograft and autograft. METHODS: Totaly 123 patients with injured anterior cruciate ligament received anterior cruciate ligament reconstruction and they were divided into two groups: 63 cases in autograft group and 60 cases in alograft group. The postoperative effects were assessed by the Lysholm score and Lachman test. RESULTS AND CONCLUSION: Al the patients were folowed for more than 8 months. After anterior cruciate ligament reconstruction, the stability of the knee joint, Lysholm scores and Lachman test results were al improved significantly in the two groups; while there was no difference between the two groups at the last folow-up (P > 0.05). The clinical outcomes of anterior cruciate ligament reconstruction with alograft and autograft are almost similar; therefore, surgeons should select ideal graft according to the patient’s condition and surgeon’s experience.

Based on the digital and network environment, this paper analyzes the problems existing in the teaching of traditional orthopedics in medical colleges and universities, including single teaching form, neglecting the students' practical skills and the phenomenon of students' poor learning initiative. It points out that the orthopedics teaching under the digital and network environment should be integrated through interactive teaching, multimedia teaching, WeChat network teaching, simulation teaching, practice teaching and other teaching forms and should pay attention to the reasonable use of teaching methods, make clear teachers and students' subject status, pay attention to students' learning ability training, so as to improve the teaching quality of orthopedics in medical colleges.

AIM: To study the inhibition of the Bax inhibitor-1(bi-1) gene expression induced with RNA interference in HO8910PM and HO8910 cell lines in addition to the apoptotic induction.METHODS: After transfection of recombinant plasmid which expresses bi-1shRNA into HO8910PM and HO8910 cells,bi-1 mRNA and protein levels were detected by reverse transcription-polymerase chain reaction(RT-PCR) and Western blotting.Apoptotic HO8910PM and HO8910 cells were detected by Hoechst 33258/PI fluorescent staining and flow cytometry.RESULTS: Compared with the control group,the expressions of bi-1 gene at mRNA and protein levels were declined evidently in the cells transfected with four candidate siRNA plasmids(P

Objective: In order to detect the effect of bcl-xs on camptothecin-induced apoptosis in human nasopharyngeal carcinoma CNE-2Z cells in vitro.Methods:bcl-xs gene-bearing mammalian expression vector(pcDNA3xs)was transfected into CNE-2Z cells using LipofectAmine.The expression of bcl-xs was determined with western blot.Cells which were transfected with native pcDNA3 vector were used as control.Apoptotic cells were detected with flow cytometry after exposure to camptothecin for 24h.Results:Cell clone(CNE-2Zxs)with stable expression of bcl-xs was obtained as confirmed with western blot.Results from flow cytometry analysis showed a significant increase of apoptotic cells in CNE-2Zxs as compared with CNE-2Zneo after treatment with the same dose of camptothecin.Conclusion:Exogenous bcl-xs expression sensitized nasopharyngeal carcinoma CNE-2Z cells to camptothecin-induced apoptosis.

This paper describes the construction and practical experience of the key laboratory for teaching of biochemistry and molecular biology,and indicates that the laboratory promotes the development of teaching and scientific research.It is proved to be a suitable measure for sharing teaching resource,improving teaching quality and raising teacher' academic level.

Objective To investigate the role of ATP￣binding cassette ( ABC ) family on the resistance of nasopharyngeal carcinoma (NPC) stem cells (CSCs) to cisplatin. Methods We compared the differences between the drug extravasation capability of CNE￣2 and CNE￣2S by using Rhodamine￣123 efflux assay. We determined the mRNA and protein expression levels of ABC transport family members, including ABCA3,ABCB1,ABCB5,ABCC1,ABCC2 and ABCG2,after 48 h being treated with 1 μmol.L-1 cisplatin by RT￣PC and Western blotting.Rhoamine￣123 efflux and apoptosis by cisplatin in two kinds of cells was examined by ABCA3 gene silencing with specific small￣interfering RNA. Results The IC50 of cisplatin on CNE￣2S was 4.1 fold to that on CNE￣2(P<0.05).For the relative drug effluent activity and Na+K+ ATPase activity,CNE￣2S was 4.8 fold to CNE￣2(P<0.05),suggested that CNE￣2S expressed more ABCA3,ABCB1,ABCC1 and ABCG2 in comparison to CNE￣2(P<0.05).After 48 h treatment with 1 μmol.L-1 cisplatin,ABCA3 specifically highly expressed in CNE￣2S (P<0.05), and knocking down of ABCA3 resulted in reduction of rhodamine￣123 efflux and increase of apoptosis. Conclusion The cisplatin resistance of NPC CSCs is associated with enhanced expression of ABCA3,ABCC1 and ABCG2, suppression of ABCA3 could reverse the resistance of NPC CSCs to cisplatin.

BACKGROUND:It is stil disputed about the treatment of subacromial impingement syndrome at present, arthroscopic subacromial decompression or open subacromial decompression. OBJECTIVE:To assess the clinical therapeutic effects of arthroscopic subacromial decompressionversus open subacromial decompression in the treatment of subacromial impingement syndrome. METHODS:Controled trials on arthroscopic subacromial decompressionversus open acromioplasty in the treatment of subacromial impingement syndrome were colected in different databases through computer search. There was no limitation for language, randomized controled trials or blinded studies. At last, the meta-analysis was conducted by using RevMan5.0 software. RESULTS AND CONCLUSION:Four randomized controled trials and six non-randomized controled trials were included in this study, involving 583 patients with subacromial impingement syndrome. The results of meta-analysis prompted that as to the hospital inpatient days and time until return to work, the group of arthroscopic subacromial decompression was shorter than open subacromial decompression. However, as to the postoperative shoulder functional scores, the operative time, patient’s satisfaction, and the rate of excelent and good results of postoperative UCLAs, there were no significant statistical differences between two groups. Due to the certain limitations and deficiencies of the quantity and quality in the included trials, there must stil need large-sample, multi-centered, high-quality randomized controled trials to confirm these results.

Objective To investigate the way that nasopharyngeal carcinoma (NPC) and NPC stem cells develops resistance to cisplatin through anti-reactive oxygen species mechanism. Methods Using CCK-8 cell counting kit, we measured the half inhibitory concentration of cisplatin against NPC cellsCNE-2and NPC stem cellsCNE-2S, and compared their resistant index. We examined the differences in the reactive oxygen species (ROS) levels, total glutathi?one (GSH) levels, and total superoxide dismutase (SOD) levels between CNE-2 and CNE-2S at different concentrations of cisplatin administration (0.1,0.5 and 1.0μmol·L-1). Using q-PCR, we determined the mRNA expression level of GSS, GCLC, GCLM, SOD1 and SOD2 after 48 hours administration of cisplatin at 1 μmol · L-1. Protein expression level of SOD2 was also tested using Western Blot after 48 hours administration of cisplatin at 1μmol · L-1. Upon silencing the SOD2 in NPC cell through siRNA, Trypan blue was used to analyze cell survival after cisplatin was administrated at 1μmol · L-1. Results The inhibition concentration of cisplatin against CNE-2 was higher than that against CNE-2S (μmol · L-1:9.8 ± 1.1 vs 2.4 ± 0.6,P<0.05). ROS levels in CNE-2 and CNE-2S both rise with cisplatin administration, but ROS levels of CNE-2 before and after cisplatin treatment were both higher than those in CNE-2S (P<0.05). The total gluta?thione levels in CNE-2 and CNE-2S were both increased after 1μmol·L-1 cisplatin treatment but there is no significant dif?ference in levels of glutathione between these two cell lines. After treated with cisplatin, SOD level were increased in both CNE-2S and CNE-2, but it is higher in CNE-2S than that in CNE-2 (P<0.05). The mRNA levels of GSS, GCLC, GCLM, and SOD1 were not different significantly between in CNE-2 and in CNE-2S with or without cisplatin treatment. However, SOD2 in CNE-2S were higher than that in CNE-2 on both mRNA and protein levels (P<0.05). Silenced SOD2 disrupted the resistance of cisplatin in CNE-2S. Conclusion These data suggest that NPC stem cells (CNE-2S) enhance its drug re?sistance to cisplatin through highly expression of SOD2 which posed anti-ROS capacity.