Objective:To design an improved lamina hook system and compare its biomechanical properties with traditional lamina hook system in fixation of lumbar spondylolysis.Methods:The thin layer CT data of the lumbosacral vertebrae of 20 healthy young male servicemen who underwent physical examination in the outpatient department of the 940th Hospital of Joint Logistics Support Force of PLA from January 2021 to August 2022 were collected. The age of the subjects was 20-30 years [(25.0±3.0)years]. A 3-dimensional model of the L 5 vertebral body was constructed using the 3-dimensional modeling software. The new improved lamina hook was designed according to the measurements including the thickness of the middle area, the longest longitudinal diameter, the curvature radius of the lower edge, the angle between the upper and lower tail ends, the thickness of the lower edge, and the longest diameter of the lower edge of the bilateral L 5 vertebral plates. One serviceman was selected from the aforementioned group to construct a linear finite element model of segments L 4-S using the 3-dimensional virtual software (normal model, model A), based on which, the L 5 bilateral spondylolysis model (model B), improved lamina hook model (model C) and traditional lamina hook models (model D) were designed. By constraining both sides of the sacrum and applying a longitudinal load of 400 N on the L 4 vertebral body, the upper 1/3 gravity of the body was simulated, and with a bending moment of 10 N·m along the X, Y, and Z directions, motions of forward flexion, backward extension, lateral bending, rotation, etc were simulated. The range of motion of segment L 4/5 and L 5/S 1 of model A was evaluated and compared with the findings of the previous researches to verify its effectiveness. The overall range of motion of models A, B, C, and D, the range of motion of segment L 4/5 and L 5/S 1, the maximum overall displacement, the maximum displacement and stress of the isthmus, the stress distribution and maximum stress of internal fixation of models C and D, and the stress distribution and maximum stress of the vertebral body of models C and D were compared. Results:(1) During forward flexion, backward extension, lateral bending and rotation, the range of motion of model A was 5.01°, 4.03°, 3.91° and 1.42° in segment L 4/5, and was 4.62°, 2.51°, 2.40° and 1.23° in segment L 5/S 1. (2) The overall range of motion, range of motion of segment L 4/5 and L 5/S 1 and maximum overall displacement of models A, C, and D were similar in axial compression, forward flexion, backward extension, left bending, and left rotation, while those of model B were significantly increased. (3) There was no significant difference in the maximum displacement of the isthmus of models A, C, and D under different motion modes, while the maximum displacement of model B in the isthmus was significantly larger than that of models A, C, and D, especially during rotation, increased by 295%, 277%, and 276% respectively. The maximum stress of the isthmus of model C was 0.938 MPa, 1.698 MPa, 0.410 MPa, 2.775 MPa, and 1.554 MPa respectively. The maximum stress in the isthmus of model D was 0.590 MPa, 1.297 MPa, 0.520 MPa, 3.088 MPa, and 2.072 MPa respectively. The maximum stress of the isthmus of models C and D was similar during axial compression and forward flexion, while the stress of the isthmus of model C was smaller than that of model D during backward extension, lateral bending, and rotation, decreased by 21.1%, 10.2%, and 25.0% respectively compared with model D. (4) The maximum stress of internal fixation in models C and D during forward flexion, backward extension, left bending, and left rotation was 135.220 MPa, 130.180 MPa, 200.940 MPa and 306.340 MPa respectively, and was 131.840 MPa, 112.280 MPa, 349.980 MPa and 370.140 MPa respectively. The maximum stress of internal fixation in the two models of internal fixation during forward flexion and backward extension was similar, while it was decreased by 42.6% and 17.2% in model C during left bending and left rotation, compared with model D. (5) The maximum stress of the vertebral body during forward flexion, backward extension, left bending, and left rotation was 79.787 MPa, 36.857 MPa, 37.943 MPa and 96.965 MPa respectively in model C, but was 80.104 MPa, 64.236 MPa, 196.010 MPa and 193.020 MPa respectively in model D. The maximum stress of models C and D was all distributed in the contact area with the internal fixation, and especially during backward extension, left bending, and left rotation, when it was reduced by 42.6%, 80.6%, and 49.8% of model C respectively, compared with that of model D. Conclusions:The improved laminar hook is more consistent with the Chinese anatomized structure of the lamina. Compared with the traditional lamina hook system, the improved lamina hook system can effectively reduce the displacement in all directions and range of motion of lumbar spondylolysis, therefor can significantly reduce the stress of internal fixation and vertebral body and has better biomechanical performance.

BACKGROUND:Cervical spondylotic myelopathy is a progressive disease leading to dysfunction in the middle-aged and elderly,and early diagnosis is difficult.In recent years,some clinical scholars have found that dynamic magnetic resonance imaging technology can detect spinal cord compression in a dynamic position earlier,but its specific biomechanical mechanism needs to be clarified. OBJECTIVE:To investigate the biomechanical compression characteristics of early cervical spondylotic myelopathy in hyperextension and flexion position,and to verify the effectiveness of dynamic magnetic resonance imaging in the diagnosis of early cervical spondylotic myelopathy. METHODS:A retrospective analysis was made on the patients who underwent cervical dynamic magnetic resonance imaging in the Department of Orthopedics of First Affiliated Hospital of Guangxi University of Chinese Medicine from January to June 2022.16 subjects were selected and divided into two groups.The pathological group included 8 patients with early cervical spondylotic myelopathy with hypertrophy of ligamentum flavum as the main sign,with 5 male patients and 3 female patients.The normal group included 8 normal degenerative people,with 4 male patients and 4 female patients.All patients were photographed with cervical CT plain scan,magnetic resonance imaging plain scan,and dynamic magnetic resonance imaging plain scan.This study was divided into the following three parts:(1)collect the dynamic magnetic resonance imaging image DCOM data of two groups of subjects,and collect the cervical vertebra CT and neutral magnetic resonance imaging image DCOM data to understand the bone and soft tissue of the two groups of subjects in the neutral position.(2)Based on the DCOM data of magnetic resonance imaging and CT plain scan,the three-dimensional finite element models of lower cervical vertebra(C3-7)of normal degenerative population and early cervical spondylotic myelopathy patients were established by reverse engineering software.The equivalent stress and equivalent elastic strain of the spinal cord and posterior dura were analyzed,and the distribution of stress and strain was observed.(3)After obtaining the stress and strain data,the data between groups were compared to analyze the mechanical characteristics of spinal cord compression caused by early cervical spondylotic myelopathy in a dynamic position and to verify the effectiveness of dynamic magnetic resonance imaging in the diagnosis of early cervical spondylotic myelopathy. RESULTS AND CONCLUSION:(1)When simulating the posterior extension,flexion and neutral position of the lower cervical vertebrae(C3-7)in the two groups,the values of stress and strain in the posterior part of the spinal cord were in the following order:extension>flexion>neutral(P<0.05).The strain values from large to small were as follows:extension>flexion>neutral(P<0.05).(2)Compared with the normal degenerative population model,the equivalent stress and strain of the spinal cord in the pathological group were higher than those in the normal group under two degrees of freedom of flexion and extension(P<0.05).The distribution area of stress and strain in the posterior part of the spinal cord was irregular.(3)In the neutral position,there was no significant difference in the strain value of the spinal cord between the two groups(P>0.05),and the strain distribution was uniform and regular.(4)It is indicated that in the cervical extension position,the dural sac and the posterior part of the spinal cord were compressed and deformed in the early cervical spondylotic myelopathy patients with the hypertrophy of ligamentum flavum as the main sign,and the degree of compression deformation of the spinal cord was significantly higher than that in the anterior flexion position and neutral position.In the neutral position,there were no obvious signs of spinal cord deformation in patients with early cervical spondylotic myelopathy.This study verified the role of dynamic magnetic resonance imaging in the diagnosis of early cervical spondylotic myelopathy from the point of view of biomechanics.

Objective:To discuss the effect of microRNA(miR)-30c-5p on the proliferation,migration,and invasion of the human prostate cancer cells(LNCap),and to clarify its possible mechanism.Methods:The LNCap cells were divided into LNCap group(without plasmid transfection),miR-30c-5p mimic group(transfected with miR-30c-5p mimic),mimic NC group(transfected with miR-30c-5p mimic NC),sh-DNA damage inducible transcript 4(DDIT4)group(transfected with sh-DDIT4),sh-NC group(transfected with sh-DDIT4 NC),miR-30c-5p mimic+pc-DNA3.1-NC group(co-transfected with miR-30c-5p mimic and pc-DNA3.1 empty vector),and miR-30c-5p mimic+pc-DNA3.1-DDIT4 group(co-transfected with miR-30c-5p mimic and pc-DNA3.1-DDIT4 over-expression plasmid).The RWPE-1 cells were cultured normally.Real-time fluorescence quantitative PCR(RT-qPCR)method was used to detect the expression levels of miR-30c-5p and DDIT4 mRNA in the cells in various groups;Western blotting method was used to detect the expression levels of DDIT4 protein in the cells in various groups;CCK-8 method was used to detect the proliferation rates of the LNCap cells in various groups;Transwell assay was used to detect the numbers of the invasion LNCap cells in various groups;Scratch assay was used to detect the scratch healing rates of LNCap cells in various groups;dual-luciferase reporter assay was used to detect the targeting relationship between miR-30c-5p and DDIT4.In the in vivo tumor formation experiment,18 male BALB/c nude mice were divided randomly into blank group,agomiR-NC group(transfected with agomiR-30c-5p NC),and agomiR-30c-5p group(transfected with agomiR-30c-5p);there were six mice in each group.The mice in agomiR-NC group and agomiR-30c-5p group were subcutaneously injected with LNCap cells,while the mice in blank group were given an equal volume of physiological saline.The volumes of tumor of the mice in various groups were detected.HE staining was used to observe the morphology of prostate cancer tissue the mice of in various groups;RT-qPCR method and immunofluorescence staining were used to detect the expression levels of miR-30c-5p and DDIT4 mRNA and the fluorescence intensities of DDIT4 protein in prostate cancer tissue of the mice in various groups.Results:The In vitro prostate cancer cell experiment results showed that compared with RWPE-1 cells,the expression level of miR-30c-5p in the prostate cancer LNCap cells was decreased(P<0.01),and the expression levels of DDIT4 mRNA and protein were increased(P<0.05 or P<0.01).After 48 of transfection,compared with LNCap group and mimic NC group,the expression level of miR-30c-5p in the LNCap cells in miR-30c-5p mimic group was increased(P<0.01).Compared with LNCap group and sh-NC group,the expression level of DDIT4 mRNA in the LNCap cells in sh-DDIT4 group was decreased(P<0.01).Compared with miR-30c-5p mimic group and miR-30c-5p mimic+pcDNA3.1 NC group,the expression level of miR-30c-5p in The LNCap cells in miR-30c-5p mimic+pc-DNA3.1-DDIT4 group was decreased(P<0.01);compared with miR-30c-5p mimic group and miR-30c-5p mimic+pcDNA3.1 NC group,the expression level of DDIT4 mRNA in the LNCap cells in miR-30c-5p mimic+pc-DNA3.1-DDIT4 group was increased(P<0.01);compared with miR-30c-5p mimic group and miR-30c-5p mimic+pcDNA3.1 NC group,the expression level of DDIT4 protein in the LNCap cells in miR-30c-5p mimic+pc-DNA3.1-DDIT4 group was increased(P<0.05).The CCK-8 method results showed that compared with LNCap group and mimic NC group,the proliferation rate of the LNCap cells in miR-30c-5p mimic group was decreased(P<0.01);compared with LNCap group and sh-NC group,the proliferation rate of the LNCap cells in sh-DDIT4 group was decreased(P<0.01);compared with miR-30c-5p mimic group and miR-30c-5p mimic+pcDNA3.1 NC group,the proliferation rate of the LNCap cells in miR-30c-5p mimic+pc-DNA3.1-DDIT4 group was increased(P<0.01).The Transwell assay results showed that compared with LNCap group and mimic NC group,the number of the invasion LNCap cells in miR-30c-5p mimic group was decreased(P<0.01);compared with LNCap group and sh-NC group,the number of invasion LNCap cells in sh-DDIT4 group was decreased(P<0.01);compared with miR-30c-5p mimic group and miR-30c-5p mimic+pcDNA3.1 NC group,the number of the invasion LNCap cells in miR-30c-5p mimic+pc-DNA3.1-DDIT4 group was increased(P<0.01).The scratch assay results showed that compared with LNCap group and mimic NC group,the scratch healing rate of the LNCap cells in miR-30c-5p mimic group was decreased(P<0.01);compared with LNCap group and sh-NC group,the scratch healing rate of the LNCap cells in sh-DDIT4 group was decreased(P<0.01);compared with miR-30c-5p mimic group and miR-30c-5p mimic+pcDNA3.1 NC group,the scratch healing rate of the LNCap cells in miR-30c-5p mimic+pc-DNA3.1-DDIT4 group was increased(P<0.01).The dual-luciferase reporter assay results showed that compared with the LNCap cells co-transfected with WT-DDIT4 and mimic NC,the luciferase activity of the LNCap cells co-transfected with WT-DDIT4 and miR-30c-5p mimic was decreased(P<0.01).The in vivo nude mouse tumor formation experiment results showed that on the 3 rd,6 th,9 th,12 th,and 15th days after cell injection,compared with blank group and agomiR-NC group,the tumor volumes of the nude mice in agomiR-30c-5p group were decreased(P<0.05).The HE staining results showed that in prostate cancer tissue of the mice in blank group and agomiR-NC group,the cell nuclei were enlarged,and nucleoli were prominent and deformed.In the mice in agomiR-30c-5p group,some regions of prostate cancer tissues results showed neatly arranged cells with normally shaped nuclei.The RT-qPCR and immunofluorescence staining showed that compared with agomiR-NC group,the expression level of miR-30c-5p in prostate cancer tissue of the mice in agomiR-30c-5p group was increased(P<0.01).Compared with blank group and agomiR-NC group,the expression level of DDIT4 mRNA in prostate cancer tissue of the mice in agomiR-30c-5p group was decreased(P<0.01).DDIT4 protein was mainly expressed in the cytoplasm.Compared with blank group and agomiR-NC group,the fluorescence intensity of DDIT4 protein in prostate cancer tissue of the mice in agomiR-30c-5p group was decreased(P<0.01).Conclusion:The expression level of miR-30c-5p in the prostate cancer LNCap cells is decreased,and it inhibits the proliferation,migration,and invasion of the prostate cancer cells by targeting downregulation of DDIT4,thereby participating in the occurrence and development of prostate cancer.

Objective To analyze the clinical characteristics and prognosis differences of the patients with hyperthyroidism complicating atrial fibrillation.Methods A retrospective analysis was adopted.The clinical data of 1 160 patients with hyperthyroidism admitted and treated in the Second Affiliated Hospital of Chengdu Medical College during 2004-2022 were collected.The patients were divided into the atrial fibrilla-tion group(n=581)and non-atrial fibrillation group(n=579)according to whether complicating atrial fibril-lation.Then the levels of thyroid functional indicators[free triiodothyronine(FT3),free tetraiodothyronine(FT4),thyroid-stimulating hormone(TSH)],cholesterol,brain natriuretic peptide(BNP),N-terminal brain natriuretic peptide precursor(NT-proBNP)and triglyceride(TG)as well as the hypertension history,diabetic history,smoking history,inner diameter of left and right atrium(ventricle),ejection fraction and NYHA grade were analyzed and compared between the two groups.The multivariate logistic regression analysis was per-formed for the above possible risk factors.Results There were statistically significant differences in the age,FT3,TSH,left atrial diameter,LVEF,NYHA grade,BNP and NT-proBNP between the two groups(P＜0.05).The multivariate logistic regression analysis results showed that left atrial inner diameter rather large,TSH rather low and BNP rather high were the independent risk factors for atrial fibrillation occurrence in the patients with hyperthyroidism.The results of receiver operating characteristic(ROS)curve of above 3 indica-tor in predicting the occurrence of atrial fibrillation occurrence in the patients with hyperthyroidism showed that the area under the curve of left atrial inner diameter was significantly higher than that of TSH and BNP,and the differences were statistically significant(P＜0.05).Conclusion When the left atrial inner diameter in the patients with hyperthyroidism is enlarged,TSH is decreased and BNP is increased,the risk of atrial fibril-lation occurrence is increased.

Objective To explore the role and mechanism of RNA demethylase fat mass and obesity-associated protein(FTO)in the ferroptosis in testicular interstitial cells induced by di(2-ethylhexyl)phthalate(DEHP).Methods Forty 3-week-old C57BL/6 male mice were randomly divided into a control group(corn oil)and 3 dosed DEHP treatment groups(5,250 and 500 mg/kg),and received an intragastric infusion of corresponding agents for 35 d,respectively.After mouse testicular interstitial TM3 cells was treated with 0,100,200 and 400 μmol/L mono-2-ethylhexyl phthalate(MEHP)for 24 h,corresponding plasmids were transfected to construct Fto overexpressing TM3 cells.Serum testosterone level was detected by ELISA,expression of testicular proteins was detected with immunohistochemical assay,and contents of Fe2+,malondialdehyde(MDA)and lipid peroxides in the testicle were detected by colorimetry.Methylated RNA immunoprecipitation,RT-PCR,and Western blotting were used to detect the level of N6-methyladenosine(m6A)modification.Results In the mice exposed to 250 and 500 mg/kg DEHP,the serum testosterone level was significantly reduced(P＜0.01),contents of Fe2+,MAD and lipid peroxides in testicular tissue were obviously increased(P＜0.01),and protein levels of RNA demethylase FTO,and ferroptosis related molecules ferritin heavy chain 1(FTH1)and glutathione peroxidase 4(GPX4)were significantly down-regulated(P＜0.05),while those of transferrin receptor(TFRC),ferroportin(FPN),cyclooxygenase-2(COX-2),and acyl-CoA synthetase long-chain family member 4(ACSL4)were notably up-regulated(P＜0.05).MEHP treatment for 24 h resulted in remarkably decreased cell viability in the TM3 cells,increased production of intracellular reactive oxygen species(ROS),reduced mitochondrial membrane potential(MMP)(P＜0.01),down-regulated mRNA and protein levels of Fto(P＜0.01),and the changes in other ferroptosis related proteins were consistent with the trend in testicular tissue,indicating ferroptosis in testicular interstitial cells.Intervention with ferroptosis inhibitor Fer-1 or overexpression of Fto significantly inhibited MEHP-induced toxicity and ferroptosis in TM3 cells(P＜0.05),and overexpression of Fto reduced the m6A modification of Gpx4 and Fth1 mRNA(P＜0.05).Conclusion Abnormal m6A modification of Gpx4 and Fth1 caused by inhibiting FTO expression may be the mechanism of ferroptosis in testicular interstitial cells induced by DEHP.

Objective:To explore the application value of ultrasonic measurement of the pubic symphysis distance in predicting pubic symphysis diastasis(PSD) during delivery.Methods:A total of 262 pregnant women from June 2021 to July 2022 who delivered at Suzhou Wuzhong People′s Hospital and Jiangyin People′s Hospital were retrospectively analyzed. The patients were divided into PSD group of 26 cases and normal pregnant women group (control group) of 234 cases according to whether or not PSD was confirmed during postpartum follow-up. Relevant data of the two groups were collected, including the biparietal diameter and femoral length of the fetus within 7 days before delivery, the pubic symphysis distance of pregnant women when the cervix was not dilated, pubic symphysis distance when the cervix dilated to 5 cm during the first stage of delivery, and the pubic symphysis distance after delivery, the age of the pregnant woman, the gestational week, the number of pregnancies, and the birth weight of the fetus. The differences of the above relevant data between the two groups were compared.Spearman correlation analysis was used to analyze the correlation between various parameters. The occurrence of postpartum PSD, and Logistic regression was used to analyze the predictive value of various parameters on the occurrence of postpartum PSD. ROC curve was used to analyze the diagnostic efficacy of each parameters to predict PSD.Results:The fetal birth weight, number of pregnancies, pubic symphysis distance in three time points in the PSD group were significantly higher than those in the control group (all P<0.05). The age of the pregnant women was negatively correlated with the occurrence of postpartum PSD ( rs=-0.152, P=0.014). The fetal birth weight, the number of pregnancies, the pubic symphysis distance in the cervix no-dilated and the first stage of labor were positively correlated with the occurrence of postpartum PSD( rs=0.160, 0.166, 0.678, 0.581, all P<0.05). Logistic regression analysis showed that the increase of pubic symphysis distance before labor would increase the risk of postpartum PSD, and the difference was statistically significant ( OR=2 506.028, 95% CI=14.293-439 402.630, P=0.003). The increase of pubic symphysis distance at the first stage of labor increased the risk of postpartum PSD, with a statistically significant difference ( OR=10 704.027, 95% CI=33.830-3 386 803.429, P=0.002). The ROC curve analysis showed that the area under the curve of the pubic symphysis distance in the cervix no-dilated and the first stage of labor for the diagnosis of PSD were 0.896 and 0.917 respectively, the sensitivity were 0.731 and 0.885, the specificity were 0.940 and 0.829, and the corresponding critical values were 0.87 cm and 1.06 cm respectively. The area under the curve of the combination of the two parameters for the diagnosis of PSD was 0.930, the sensitivity was 0.885, and the specificity was 0.876. Conclusions:Ultrasonic measurement of pubic symphysis distance during delivery can predict the occurrence of postpartum PSD in pregnant women and can provide a basis for the occurrence and treatment of postpartum pubic symphysis separation in pregnant women.

[Objective] To construct a Nomogram model for the prediction of essential hypertension (EH) risks with the use of traditional Chinese medicine (TCM) syndrome elements principles in conjunction with cutting-edge biochemical detection technologies. [Methods] A case-control study was conducted, involving 301 patients with essential hypertension in the hypertensive group and 314 without in the control group. Comprehensive data, including the information on the four TCM diagnoses, general data, and blood biochemical indicators of participants in both groups, were collected separately for analysis. The differentiation principles of syndrome elements were used to discern the location and nature of hypertension. One-way analysis was carried out to screen for potential risk factors of the disease. Least absolute shrinkage and selection operator (LASSO) regression was used to identify factors that contribute significantly to the model, and eliminate possible collinearity problems. At last, multivariate logistic regression analysis was used to both screen and quantify independent risk factors essential for the prediction model. The “rms” package in the R Studio was used to construct the Nomogram model, creating line segments of varying lengths based on the contribution of each risk factor to aid in the prediction of risks of hypertension. For internal model validation, the Bootstrap program package was utilized to perform 1000 repetitions of sampling and generate calibration curves. [Results] The results of the multivariate logistic regression analysis revealed that the risk factors of EH included age, heart rate (HR), waist-to-hip ratio (WHR), uric acid (UA) levels, family medical history, sleep patterns (early awakening and light sleep), water intake, and psychological traits (depression and anger). Additionally, TCM syndrome elements such as phlegm, Yin deficiency, and Yang hyperactivity contributed to the risk of EH onset as well. TCM syndrome elements liver, spleen, and kidney were also considered the risk factors of EH. Next, the Nomogram model was constructed using the aforementioned 14 risk predictors, with an area under the curve (AUC) of 0.868 and a 95% confidence interval (CI) ranging from 0.840 to 0.895. The diagnostic sensitivity and specificity were found to be 80.7% and 85.0%, respectively. Internal validation confirmed the model’s robust predictive performance, with aconsistency index (C-index) of 0.879, underscoring the model’s strong predictive ability. [Conclusion] By integrating TCM syndrome elements, the Nomogram model has realized the objective, qualitative, and quantitative selection of early warning factors for developing EH, resulting in the creation of a more comprehensive and precise prediction model for EH risks.

Gastric varices (GV) is one of the complications of portal hypertension, it has a lower incidence than esophageal varices, but bleeding from GV is not easy to control, and GV is associated with a high rebleeding rate and high mortality. GV has different characteristics of vascular anatomy and hemodynamics from esophageal varices, with a unique corresponding clinical management strategy. In order to deepen the understanding of GV hemodynamic characteristics and develop an individualized treatment strategy for GV bleeding, Digestive Minimally Invasive Intervention Collaborative Group, Chinese Society of Gastroenterology, Chinese Medical Association invited experts in this field to develop this consensus.

Objective To investigate the related factors of nursing dependence in bladder cancer patients with urinary diversion and abdominal wall stoma.Methods The clinical data of 120 patients with bladder cancer undergoing abdominal ostomy with urinary diversion in the hospital from June 2020 to June 2022 were retrospectively analyzed.The self-esteem scale,the civilian version of the Post-traumatic Stress Disorder Scale,the Personal Sense of Control Scale,and the Nursing Care Dependence Scale were used to evaluate the self-esteem level,post-traumatic stress disorder level,personal sense of control level and nursing dependence degree of patients,and carry out univariate and multivariate regression analysis on the influencing factors of nursing dependence in patients with bladder cancer urinary diversion and abdominal stoma.Results The total score of nursing dependence in 120 bladder cancer patients with urinary diversion and abdominal wall stoma was 56.95±7.94.The lowest score was activity,followed by excretion and cleanliness.Univariate analysis showed that there were statistically significant differences in the nursing dependence scores of patients with different age,marital status,educational level,work status,per capita monthly income,and comorbidities(P＜0.05);the patients'self-esteem,the civilian version of the Traumatic Stress Disorder Scale,and the Personal Sense of Control Scale scores were 25.08±2.59,46.04±5.72,24.18±2.95,respectively;after multi-factor a-nalysis,it can be seen that age,education level,comorbidities,self-esteem level,post-traumatic stress obstacles and personal control finally entered the regression equation as factors influencing dependence on care for pa-tients with urinary diversion abdominal wall stoma for bladder cancer(P＜0.05).Conclusion Bladder cancer patients with urinary diversion abdominal wall stoma have the highest degree of dependence on nursing care for mobility,excretion and cleaning.Age,education level,complications,self-esteem,post-traumatic stress dis-order,and personal sense of control are related factors that affect the degree of dependence on nursing care.

Objective To study the effect of storage duration on compressive mechanical properties of rabbit patellar, so as to provide references for in vitro ligament storage.Methods The compressive mechanical properties of rabbit patellar ligament storaged at -20 ℃ at different storage durations (in 36 d) were tested with the universal tensile test machine. The microscopic morphology of collagen fibers was observed under the scanning electron microscopy (SEM). The enthalpy and denaturation temperature of collagen fibers were measured with differential scanning calorimetry (DSC).Results With the increase of storage duration, the compressive stress of the patellar ligament at 40% strain increased from 19 kPa to 112 kPa and then decreased to 57 kPa. SEM observation showed that the cross-linking of collagen fibers was initially strengthened and then weakened. DSC results showed that the enthalpy increased from 59.47 J/g to 67.10 J/g and then decreased to 54.43 J/g. The denaturation temperature increased from 67.62 ℃ to 77.28 ℃ and then decreased to 64.10 ℃.Conclusions When rabbit patellar ligament is stored at -20 ℃, with the increase of storage duration, the compressive stress of rabbit patellar ligament at 40% strain increases at first and then decreases. This change may be due to the variation of cross-linking level of collagen fibers. The stronger the cross-linking of collagen fibers, the stronger the compressive mechanical properties will be.