ObjectiveTo investigate the effects of zinc finger E-box binding homeobox 1 （ZEB1） on the proliferation， migration， and invasion of lung adenocarcinoma H322 cells， as well as its underlying molecular mechanisms. MethodsThe gene expression characteristics of the transcription factor ZEB1 in lung adenocarcinoma were analyzed using data from the GEO and TCGA public databases. RT-qPCR and Western blot were employed to measure mRNA and protein expression levels of ZEB1 in lung adenocarcinoma cell lines （H322， A549， 95-D） and normal human bronchial epithelial cells （BEAS-2B）. Lentiviral transduction was utilized to establish stable ZEB1-overexpressing （Oe-ZEB1） and vector control （Oe-NC） H322 cell lines. Cell proliferation was assessed using CCK-8， colony formation， and EdU assays， while apoptosis was evaluated by Hoechst33258/PI double staining. Wound healing and Transwell assays were performed to examine cell migration and invasion capabilities. Cell cycle distribution was determined by flow cytometry， and Western blot was used to analyze protein expression changes in relevant signaling pathways. ResultsThe findings from GEO and TCGA indicated that ZEB1 expression in lung adenocarcinoma varied with tumor malignancy grade. RT-qPCR and Western blot analyses revealed significantly higher ZEB1 expression in lung adenocarcinoma cell lines compared to BEAS-2B cells （P0.05）. Results from the CCK-8， colony formation， EdU， wound healing， and Transwell assays demonstrated that， compared with the un-transfected control （Control） group， Oe-ZEB1 H322 cells exhibited enhanced proliferation， migration， and invasion capabilities （P0.05）. Hoechst33258/PI double staining and flow cytometry analyses showed that， relative to the Control group， apoptosis was reduced in Oe-ZEB1 H322 cells （P0.05）. Additionally， a decreased proportion of cells in the G₁ phase and an increased proportion in the S phase were observed in Oe-ZEB1 cells， indicating accelerated cell cycle progression. Western blot analysis further revealed that， compared with the Control group， Oe-ZEB1 H322 cells exhibited upregulated expression of N-cadherin， mutant p53 （mutp53）， and Cyclin D1 （P0.05）， while expression levels of E-cadherin， murine double minute 2 （MDM2）， and p21 were downregulated （P0.05）. ConclusionOverexpression of ZEB1 promotes the proliferation， migration， and invasion of lung adenocarcinoma H322 cells and may facilitate cell cycle progression by modulating the MDM2/mutp53/p21 signaling pathway， thereby promoting the transition of cells from the G₀/G₁ phase to the S phase.

The recombinant human thyroid-stimulating hormone (rhTSH) can be used for differentiated thyroid cancer (DTC) preparation before ¹³¹I therapy, and follow-up. Since its approval by the American Food and Drug Administration (FDA) in 1998, rhTSH has been clinically used in European countries, the United States, and other countries for nearly 30 years. In April 2024, China’s first independently developed rhTSH agent was approved. Based on clinical experience and evidence from domestic and international studies, an expert consensus on the application of rhTSH has been developed following thorough consultations among experts. The consensus offers evidence-based recommendations to guide the appropriate use of rhTSH in clinical practice.

Objective:To investigate the risk factors associated with 90-day mortality in critically ill patients receiving continuous renal replacement therapy (CRRT), with a particular focus on the association between hypotension within the first hour of CRRT initiation and 90-day mortality after hospital admission.Methods:This study was a post hoc analysis of a prospective cohort study investigating the impact of colloid versus crystalloid priming solutions on early hemodynamics in critically ill patients undergoing CRRT. The study enrolled intensive care unit patients who received CRRT at West China Hospital of Sichuan University from January 2024 to May 2024. The data were collected including demographic characteristics, laboratory tests, CRRT-related parameters, blood pressure, heart rate, sequential organ failure assessment scores, and vasoactive-inotropic score, etc. The 90-day survival outcome after hospital admission of critically ill patients aged 18-80 years who received continuous veno-venous hemodiafiltration was used as the primary outcome indicator. A Cox proportional hazards model analysis was conducted, and the predictive ability of the model was evaluated along with the test of the proportional hazards assumption. The risk factors associated with the 90-day mortality after hospital admission of critically ill patients receiving CRRT were explored, with a particular focus on whether hypotension occurring within the first hour of CRRT initiation was one of these risk factors.Results:A total of 208 patients were included in this study. Within 90 days after hospital admission, 141 patients (67.8%) died, among whom 102 were male (72.3%) and the median age was 61.0 (50.0, 71.5) years; 67 patients (32.2%) survived, among whom 53 were males (79.1%) and the median age was 56.0 (47.0, 68.0) years. The incidence of hypotension within the first hour of CRRT initiation was significantly higher in the death group than in the survival group [29.8% (42/141) vs. 16.4% (11/67), χ2=4.275, P=0.039]. Moreover, The mortality rate of the group with hypotension within the first hour of CRRT initiation was higher than that of the group without hypotension [79.2% (42/53) vs. 63.9% (99/155), χ2=4.275, P=0.039]. The Kaplan-Meier survival analysis showed that the median survival time of patients without hypotension within the first hour of CRRT initiation [39.0 d (95% CI 23.2-54.8)] was longer than that of patients with hypotension [26.0 d (95% CI 18.9-33.1)], and the 90-day cumulative survival rate after hospital admission of patients without hypotension was significantly higher than that of patients with hypotension (Log-rank test, χ2=5.100, P=0.024). Univariate and multivariate Cox proportional hazards analyses demonstrated that serum albumin ( HR=0.964, 95% CI 0.933-0.997, P=0.030), sequential organ failure assessment score ( HR=1.064, 95% CI 1.012-1.118, P=0.015), and the use of mechanical ventilation ( HR=8.272, 95% CI 1.145-59.743, P=0.036) were significantly associated with 90-day mortality in critically ill patients undergoing CRRT. In contrast, the vasoactive-inotropic score ( HR=1.004, 95% CI 0.999-1.008, P=0.079) and the presence of hypotension within the first hour of CRRT initiation ( HR=1.236, 95% CI 0.833-1.835, P=0.293) were not significantly associated with 90-day mortality in critically ill patients undergoing CRRT. The consistency index of this model was 0.654 (95% CI 0.617-0.691), the area under the receiver operating characteristic curve was 0.724 (95% CI 0.658-0.800), and the calibration curve showed that the predicted values of the model were well fitted to the actual observations, suggesting that the predictive effect of this model was relatively ideal. Conclusions:In critically ill patients undergoing CRRT, the occurrence of hypotension within the first hour of CRRT initiation was not significantly associated with 90-day mortality after hospital admission. Lower serum albumin levels, higher sequential organ failure assessment scores, and the use of mechanical ventilation may be the risk factors for 90-day mortality in this population.

Objectives:To evaluate the biomechanics of a new self-developed bidirectional self-locking fusion device in vitro.Methods:12 fresh L3/4 segment specimens of domestic pig spine were randomly divided into 3 groups for modeling:normal group(intact state),traditional fusion device group(traditional fusion device and unilateral screw fixation)and new fusion device group(bidirectional self-locking fusion device implanted).On the basis of MTS multi-freedom(spinal motion)simulation test system and 500N preload,8N·m load was applied to experimental specimens in each direction successively,and the stability test was carried out according to the order of forward bending,backward extension,left bending,right bending,and left and right rotation.The ranges of motion(ROMs)were compared between groups under different working conditions.The axial fatigue compression test was carried out with TT-JQ-01-106 fatigue testing machine to evaluate the stability and reliability of the self-developed fusion device.Results:Compared with the normal group,the ROM of the new fusion device group was significantly decreased under the conditions of flexion(1.67°±0.65° vs 3.46°±0.16°),extension(1.43°±1.01° vs 1.89°±0.29°),left bending(2.07°±1.32° vs 3.08°±0.09°),right bending(1.38°±0.72° vs 4.37°±0.20°),and right rotation(2.17°±1.51° vs 5.10°±0.37°)(all P＜0.05);Under the left rotation condition,the ROM value(3.10°±1.57°)of the new device group was significantly higher than that of the normal group(2.36°±0.62°)(P＜0.05).Compared with the conventional fusion device group,the ROM of the new fusion device group was significantly increased under flexion(1.67°±0.65° vs 1.22°±0.76°)and left rotation(3.10°±1.57° vs 1.57°±0.91°)conditions(P＜0.05);However,there were no significant differences in ROMs between the two groups under extension(1.43°±1.01° vs 1.06°±0.50°),left bending(2.07°±1.32° vs 1.87°±1.41°),right bending(1.38°±0.72° vs 1.45°±0.69°),and right rotation(2.17°±1.51° vs 1.69°±1.07°)conditions(P＞0.05).The ROM values of the normal group under flexion,extension,left bending,right bending,and right rotation conditions were significantly higher than those of the other two groups(P＜0.05).Fatigue test:after 5 million load-displacement cycles,visual inspection revealed no deformation or cracks in the fusion device,and the axial compression fatigue test was passed.Conclusions:The bidirectional self-locking fusion device can obviously improve the stability of the fusion segment,which is equivalent to the stability of using the posterior single-sided nail rod system,meanwhile,it has good fatigue resistance,therefore its mechanical properties can meet the needs of clinical applications.

Objective:To investigate the effects of thoracolumbar vertebral fracture with incomplete spinal cord injury on male sexual function and postoperative prognosis.Methods:A retrospective review was conducted on data from 144 male patients with thoracolumbar vertebral fractures and incomplete spinal cord injuries treated between May 2009 and May 2021 in the Department of Traumatology and Orthopedics at Peking University Third Hospital. Patients ranged in age from 19 to 55 years (mean: 38.6±10.6 years) and underwent posterior incision and reduction internal fixation. The International Index of Erectile Function-5 (IIEF-5), the Premature Ejaculation Diagnostic Tool (PEDT), and the International Spinal Cord Injury Male Sexual Function Basic Data Set were used for sexual function evaluation. Based on the American Spinal Injury Association (ASIA) Spinal Cord Injury classification, changes in neurological and sexual function were assessed at the pre-injury stage, 3 months post-injury, 2 years postoperatively, and at the final follow-up. Factors influencing sexual dysfunction and recovery were analyzed. Spearman correlation analysis was used to identify factors affecting sexual function injury and recovery.Results:A total of 117 patients were included in the final analysis. Follow-up duration ranged from 26.2 to 161.7 months (mean: 74.6±40.5 months). After injury, ASIA grades were distributed as follows: 43 patients with grade B, 41 with grade C, and 33 with grade D. At the 2-year follow-up, 30 patients were grade E, 63 grade D, 19 grade C, and 5 grade B. Improvement in ASIA classification was observed in 90.6% (106/117) of patients: 79 improved by one grade, 27 by two grades, 8 remained unchanged, 1 worsened by one grade, and 2 worsened by two grades. Mean IIEF-5 scores were 19.5±6.4 pre-injury, 8.7±8.0 at 3 months post-injury, and 17.5±7.1 at 2 years postoperatively, with statistically significant differences ( F=123.247, P<0.001). Differences between 3 months post-injury vs. pre-injury and 2 years postoperatively vs. 3 months post-injury were statistically significant ( P<0.05). Mean PEDT scores were 5.3±3.1 pre-injury, 6.9±5.2 at 3 months post-injury, and 6.4±5.1 at 2 years postoperatively, with statistically significant differences ( F=17.014, P<0.001). The difference between 3 months post-injury and pre-injury was statistically significant ( P<0.05), but not between 2 years postoperatively and 3 months post-injury ( P>0.05). At the 2-year follow-up, 96 patients had their IIEF-5 classification restored to pre-injury levels, 85 restored PEDT classifications, and 83 restored both. Post-injury ASIA classification was positively correlated with a decrease in IIEF-5 score and an increase in PEDT score at 3 months post-injury ( P<0.05). Injury segment was positively correlated with the decrease in IIEF-5 score ( P<0.05). Time from injury to surgery showed a positive correlation with increased PEDT score at 3 months ( P<0.05). Post-injury ASIA grade, injury segment, time to surgery, age, intraoperative decompression, and spinal cord function recovery all showed significant correlations with changes in IIEF-5 and (or) PEDT scores at 2 years postoperatively ( P<0.05). According to the International Spinal Cord Injury Male Sexual Function Basic Data Set, the proportion of patients willing to discuss sexual issues increased from 29.9% at 3 months post-injury to 47.9% at 2 years postoperatively ( P<0.05). The proportion of patients with absent or diminished psychogenic erections remained stable (48.7% vs. 48.9%, P>0.05), while those with normal reflexive erections increased from 34.2% to 65.0% ( P<0.05). Conclusion:Thoracolumbar fractures with incomplete spinal cord injury result in reduced erectile function and increased incidence of premature ejaculation. The degree of spinal cord injury and the level of the injured segment are strongly correlated with the extent of sexual dysfunction. At the 2-year postoperative follow-up, 70.9% of patients had recovered sexual function to pre-injury levels.

Objective:To investigate the risk factors associated with 90-day mortality in critically ill patients receiving continuous renal replacement therapy (CRRT), with a particular focus on the association between hypotension within the first hour of CRRT initiation and 90-day mortality after hospital admission.Methods:This study was a post hoc analysis of a prospective cohort study investigating the impact of colloid versus crystalloid priming solutions on early hemodynamics in critically ill patients undergoing CRRT. The study enrolled intensive care unit patients who received CRRT at West China Hospital of Sichuan University from January 2024 to May 2024. The data were collected including demographic characteristics, laboratory tests, CRRT-related parameters, blood pressure, heart rate, sequential organ failure assessment scores, and vasoactive-inotropic score, etc. The 90-day survival outcome after hospital admission of critically ill patients aged 18-80 years who received continuous veno-venous hemodiafiltration was used as the primary outcome indicator. A Cox proportional hazards model analysis was conducted, and the predictive ability of the model was evaluated along with the test of the proportional hazards assumption. The risk factors associated with the 90-day mortality after hospital admission of critically ill patients receiving CRRT were explored, with a particular focus on whether hypotension occurring within the first hour of CRRT initiation was one of these risk factors.Results:A total of 208 patients were included in this study. Within 90 days after hospital admission, 141 patients (67.8%) died, among whom 102 were male (72.3%) and the median age was 61.0 (50.0, 71.5) years; 67 patients (32.2%) survived, among whom 53 were males (79.1%) and the median age was 56.0 (47.0, 68.0) years. The incidence of hypotension within the first hour of CRRT initiation was significantly higher in the death group than in the survival group [29.8% (42/141) vs. 16.4% (11/67), χ2=4.275, P=0.039]. Moreover, The mortality rate of the group with hypotension within the first hour of CRRT initiation was higher than that of the group without hypotension [79.2% (42/53) vs. 63.9% (99/155), χ2=4.275, P=0.039]. The Kaplan-Meier survival analysis showed that the median survival time of patients without hypotension within the first hour of CRRT initiation [39.0 d (95% CI 23.2-54.8)] was longer than that of patients with hypotension [26.0 d (95% CI 18.9-33.1)], and the 90-day cumulative survival rate after hospital admission of patients without hypotension was significantly higher than that of patients with hypotension (Log-rank test, χ2=5.100, P=0.024). Univariate and multivariate Cox proportional hazards analyses demonstrated that serum albumin ( HR=0.964, 95% CI 0.933-0.997, P=0.030), sequential organ failure assessment score ( HR=1.064, 95% CI 1.012-1.118, P=0.015), and the use of mechanical ventilation ( HR=8.272, 95% CI 1.145-59.743, P=0.036) were significantly associated with 90-day mortality in critically ill patients undergoing CRRT. In contrast, the vasoactive-inotropic score ( HR=1.004, 95% CI 0.999-1.008, P=0.079) and the presence of hypotension within the first hour of CRRT initiation ( HR=1.236, 95% CI 0.833-1.835, P=0.293) were not significantly associated with 90-day mortality in critically ill patients undergoing CRRT. The consistency index of this model was 0.654 (95% CI 0.617-0.691), the area under the receiver operating characteristic curve was 0.724 (95% CI 0.658-0.800), and the calibration curve showed that the predicted values of the model were well fitted to the actual observations, suggesting that the predictive effect of this model was relatively ideal. Conclusions:In critically ill patients undergoing CRRT, the occurrence of hypotension within the first hour of CRRT initiation was not significantly associated with 90-day mortality after hospital admission. Lower serum albumin levels, higher sequential organ failure assessment scores, and the use of mechanical ventilation may be the risk factors for 90-day mortality in this population.

Objective To investigate the therapeutic effects and mechanisms of Huangqi Jianzhong Decoction(HJD)on gastric mucosal injury induced by Helicobacter pylori(Hp)infection.Methods A Wistar rat model of Hp-induced gastric mucosal injury was established.Successfully modeled rats were randomly divided into five groups:model group,low-,medium-and high-dose HJD groups,and quadruple therapy group(Omeprazole+Amoxicillin+Clarithromycin+Colloidal Bismuth pectin),8 rats per group,with an additional normal group.After 4 weeks of treatment,gastric mucosal pathological changes were assessed by hematoxylin-eosin(HE)staining.Serum levels of interleukin 1β(IL-1β),interleukin 18(IL-18),tumor necrosis factor α(TNF-α),chemokine(C-X-C motif)ligand 1(CXCL1),chemokine(C-X-C motif)ligand 9(CXCL9),and gastrin-17(G-17)were measured by enzyme-linked immunosorbent assay(ELISA).Protein expression levels of IRF8,IFN-γ,interferon-induced tetratricopeptide repeat protein 3(Ifit3)and uridine phosphorylase 1(Upp1)in gastric mucosal tissues were detected by Western Blot.Results Compared with the normal group,the model group exhibited significant gastric mucosal damage,serum levels of IL-1β,IL-18,TNF-α,CXCL1 and CXCL9 were significantly increased,G-17 was drcreased,and protein expression levels of IRF8,IFN-γ,Ifit3 and Upp1 in gastric mucosa were significantly increased,the differences being statistically significant(P＜0.05).Compared with the model group,the gastric mucosal tissue injury of rats in the medium-and high-dose of HJD groups and the quadruple therapy group was significantly improved,the levels of IL-1β,IL-18,TNF-α,CXCL1 and CXCL9 in serum were significantly decreased,G-17 was significantly increased,and the protein expression levels of IRF8,IFN-γ,Ifit3 and Upp1 in gastric mucosa were significantly decreased,the differences being statistically significant(P＜0.05).The effect in above indexes in high-does HJD groups was superior to the low-and mediun-groups.Conclusion HJD alleviates Hp-induced gastric mucosal injury by inhibiting the IRF8/IFN-γ signaling pathway and subsequent inflammatory responses.

Objective To assess the clinical value of prognostic nutritional index(PNI)in predicting the prognosis of patients with advanced liver cancer treated with transarterial chemoembolization(TACE)combined with ablation therapy.Methods A total of 112 patients with advanced liver cancer,who received TACE combined with ablation at the Lishui Municipal Central Hospital of China from January 2020 to January 2024,were enrolled in this study.The general data,survival status,and survival time were collected.The Youden index of PNI was calculated using the receiver operating characteristic(ROC)curve model,and the optimal cutoff value was determined.Based on the optimal cutoff value,the patients were divided into low-PNI group and high-PNI group.The progression-free survival(PFS)and overall survival(OS)time were compared between the two groups,and the independent risk factors affecting PFS and OS were analyzed.Results The Youden index for PNI was 0.43,and the optimal cutoff value of PNI was 43.95.The low-PNI group included 65 patients,and the high-PNI group included 47 patients.There were no statistically significant differences in the baseline data between the two groups.The median PFS and the median OS in the high-PNI group were 13.21 months(95％CI=4.37-22.03)and 40.80 months(95％CI=31.55-50.05)respectively,which were longer than 9.20 months(95％CI=6.58-11.82)and 21.37 months(95％CI=16.56-26.17)respectively in the low-PNI group,the differences were statistically significant(both P＜0.05).The 6-month,one-year and 2-year PFS in the high-PNI group was 56.95％,47.25％and 33.87％respectively,which were higher than 43.95％,32.56％and 16.31％respectively in the low-PNI group.The one-year,2-year and 3-year cumulative survival rates in the high-PNI group were 80.77％,66.66％and 39.40％respectively,which were higher than 63.79％,34.31％and 27.75％respectively in the low-PNI group.Multivariate regression analysis indicated that the number of nodules,metastasis and PNI significantly affected OS,and metastasis and PNI strikingly affected PFS.High PNI was a protective factor for both PFS and OS.Conclusion For patients with advanced liver cancer treated with TACE combined with ablation therapy,PNI is an effective indicator for predicting the prognosis.

Objective To evaluate the combination score of albumin-bilirubin index(ALBI)and alkaline phosphatase(ALP)in predicting the prognosis of patients with cirrhosis complicated by portal hypertension after receiving transjugular intrahepatic portosystemic shunt(TIPS).Methods A total of 61 patients with cirrhosis complicated by portal hypertension,who received TIPS treatment at the Lishui Municipal Central Hospital of China from January 2016 to June 2024,were retrospectively collected.According to the Youden index of ALBI and ALP,the optimal cut-off values were calculated,and the patients were divided into low ALBI-low ALP group(0-point group),high ALBI-high ALP group(2-point group),and high ALBI-low ALP or low ALBI-high ALP group(one-point group).The efficacy of ALBI-ALP score in predicting the prognosis of patients was evaluated,and the survival rate and median survival time were compared between each other among the three groups.The independent risk factors affecting the survival time of patients were analyzed.Results The maximum Youden indexes of ALBI and ALP were 0.31 and 0.34 respectively,and the optimal cut-off values were-1.56 and 108.50 respectively.There were statistically significant differences in MELD score,Child-Pugh classification,and alanine aminotransferase level between each other among the three groups(all P＜0.05).The area under the ROC curve(AUC)of ALBI-ALP score was 0.77(95％ CI:0.66-0.89,P=0.000 2),which was better than 0.52 of the MELD score(95％ CI:0.37-0.67,P=0.77)as well as better than 0.57 of the Child-Pugh classification(95％ CI:0.43-0.72,P=0.34).The total mortality of patients was 49.18％.The mortality in the 0-point group was 11.11％(2/18),which was significantly lower than 59.46％(22/37)in the one-point group as well as than 100％(6/6)in the 2-point group,and the differences were statistically significant(x2=18.20,P＜0.001).In the 0-point group,as a large number of patients were still alive at the end of the study,the median survival time was unable to be calculated.The median survival time in the one-point group was 38.00 months(95％ CI:23.01-52.99 months),which in the 2-point group was only 1.00 month(95％ CI=0.00-2.60 months),the difference was statistically significant(x2=33.08,P＜0.000 1).In the 0-point group,one-point group and 2-point group,the one-year survival rates were 100％,66％ and 17％respectively,the 2-year survival rates were 100％,64％ and 17％ respectively,and the 3-year survival rates were 90％,53％ and 0％ respectively.Cox multivariate regression analysis showed that the combination score of ALBI and ALP(HR=7.11,95％ CI:2.95-17.15)was an independent risk factor for the survival time of patients with cirrhosis complicated by portal hypertension after receiving TIPS.Conclusion The combination score of ALBI and ALP can effectively predict the prognosis of patients with cirrhosis complicated by portal hypertension after receiving TIPS,and this score is an independent risk factor affecting the survival time of patients.

Objectives:To evaluate the biomechanics of a new self-developed bidirectional self-locking fusion device in vitro.Methods:12 fresh L3/4 segment specimens of domestic pig spine were randomly divided into 3 groups for modeling:normal group(intact state),traditional fusion device group(traditional fusion device and unilateral screw fixation)and new fusion device group(bidirectional self-locking fusion device implanted).On the basis of MTS multi-freedom(spinal motion)simulation test system and 500N preload,8N·m load was applied to experimental specimens in each direction successively,and the stability test was carried out according to the order of forward bending,backward extension,left bending,right bending,and left and right rotation.The ranges of motion(ROMs)were compared between groups under different working conditions.The axial fatigue compression test was carried out with TT-JQ-01-106 fatigue testing machine to evaluate the stability and reliability of the self-developed fusion device.Results:Compared with the normal group,the ROM of the new fusion device group was significantly decreased under the conditions of flexion(1.67°±0.65° vs 3.46°±0.16°),extension(1.43°±1.01° vs 1.89°±0.29°),left bending(2.07°±1.32° vs 3.08°±0.09°),right bending(1.38°±0.72° vs 4.37°±0.20°),and right rotation(2.17°±1.51° vs 5.10°±0.37°)(all P＜0.05);Under the left rotation condition,the ROM value(3.10°±1.57°)of the new device group was significantly higher than that of the normal group(2.36°±0.62°)(P＜0.05).Compared with the conventional fusion device group,the ROM of the new fusion device group was significantly increased under flexion(1.67°±0.65° vs 1.22°±0.76°)and left rotation(3.10°±1.57° vs 1.57°±0.91°)conditions(P＜0.05);However,there were no significant differences in ROMs between the two groups under extension(1.43°±1.01° vs 1.06°±0.50°),left bending(2.07°±1.32° vs 1.87°±1.41°),right bending(1.38°±0.72° vs 1.45°±0.69°),and right rotation(2.17°±1.51° vs 1.69°±1.07°)conditions(P＞0.05).The ROM values of the normal group under flexion,extension,left bending,right bending,and right rotation conditions were significantly higher than those of the other two groups(P＜0.05).Fatigue test:after 5 million load-displacement cycles,visual inspection revealed no deformation or cracks in the fusion device,and the axial compression fatigue test was passed.Conclusions:The bidirectional self-locking fusion device can obviously improve the stability of the fusion segment,which is equivalent to the stability of using the posterior single-sided nail rod system,meanwhile,it has good fatigue resistance,therefore its mechanical properties can meet the needs of clinical applications.