BACKGROUND:We have successfully established an animal model of small ear pig in southern Yunnan province with internal tension relieving technique combined with autologous Achilles tendon for anterior cruciate ligament reconstruction,and verified the stability and reliability of the model.However,whether internal tension relieving technique can promote the ligamentalization process of autologous Achilles tendon graft has not been studied. OBJECTIVE:To investigate the differences in the process of ligamentalization between conventional reconstruction and internal reduction reconstruction of the anterior cruciate ligament by gross view,histology and electron microscopy. METHODS:Thirty adult female small ear pigs in southern Yunnan province were selected.Anterior cruciate ligament reconstruction was performed on the left knee joint with the ipsilateral knee Achilles tendon(n=30 in the normal group),and anterior cruciate ligament reconstruction was performed on the right knee joint with the ipsilateral knee Achilles tendon combined with the internal relaxation and enhancement system(n=30 in the relaxation group).The autogenous right forelimb was used as the control group;the anterior cruciate ligament was exposed but not severed or surgically treated.At 12,24,and 48 weeks after surgery,10 animals were sacrificed,respectively.The left and right knee joint specimens were taken for gross morphological observation to evaluate the graft morphology.MAS score was used to evaluate the excellent and good rate of the ligament at each time point.Hematoxylin-eosin staining was used to evaluate the degree of ligament graft vascularization.Collagen fibers and nuclear morphology were observed,and nuclear morphology was scored.Ultrastructural remodeling was evaluated by scanning electron microscopy and transmission electron microscopy. RESULTS AND CONCLUSION:(1)The ligament healing shape of the relaxation group was better at various time points after surgery,and the excellent and good rate of MAS score was higher(P<0.05).Moreover,the relaxation group could obtain higher ligament vascularization score(P<0.05).(2)The arrangement of collagen bundles and fiber bundles in the two groups gradually tended to be orderly,and the transverse fiber connections between collagen gradually increased and thickened,suggesting that the strength and shape degree of the grafts were gradually improved,but the ligament remodeling in the relaxation group was always faster than that in the normal group at various time points after surgery.(3)The diameter,distribution density,and arrangement degree of collagen fibers in the relaxation group were better than those in the normal group at all time points,especially in the comparison of collagen fiber diameter between and within the relaxation group(P<0.05).

BACKGROUND:Internal tension-reduction technique is to reconstruct the anterior cruciate ligament through high-strength suture system combined with tendon.It can effectively reduce graft relaxation and frets by sharing the internal load of the knee joint,and has achieved good biomechanical results and clinical efficacy.However,whether it can reduce cartilage degeneration after anterior cruciate ligament reconstruction through stress sharing reduction has not been studied. OBJECTIVE:To investigate the effect of internal tension-reduction technique on articular cartilage degeneration in southern Yunnan small-ear pigs undergoing anterior cruciate ligament reconstruction. METHODS:Ten adult female Yunnan small-ear pigs were selected,and the ipsilateral knee Achilles tendon was taken from the left knee joint for anterior cruciate ligament reconstruction(normal group,n=10),and the ipsilateral knee Achilles tendon from the right knee joint combined with internal tension-reduction and augmentation system for anterior cruciate ligament reconstruction(tension-reduction group,n=10).One year after surgery,the experimental pigs were sacrificed,and the left and right knee cartilage was taken for hematoxylin-eosin staining,Safranin O-fast green staining,Osteoarthritis Research Society International scoring,and immunohistochemistry staining of type Ⅱ collagen,interleukin-1β,and tumor necrosis factor-alpha in the cartilage. RESULTS AND CONCLUSION:Hematoxylin-eosin staining showed that in the tension-reduction group,there were mild pathologic changes of osteoarthritis,with a low number of empty bone lacunae and no obvious pathological changes such as fibrosis or cell layer breakage;in the normal group,more severe cartilage damage,with an increased number of empty bone lacunae,loss of chondrocytes near the bone and even the formation of fissures.Safranin O-fast green staining indicated that the tension-reduction group had normal cartilage tissue thickness,flat cartilage surface,a neat cell arrangement in a polar pattern,and no swelling or apoptosis,while in the normal group,the thickness of cartilage tissue was obviously thinner,the cell arrangement was disordered with no polarity,the number of cells was reduced,obvious cartilage fractures and cartilage vacuoles formed,and the absence of cells near the central bone was obvious.The Osteoarthritis Research Society International score was significantly lower in the tension-reduction group than in the normal group(P＜0.05).Immunohistochemical findings showed that the protein expression of type Ⅱ collagen in cartilage tissue of the tension-reducing group was higher than that of the normal group(P＜0.05),and the protein expression of interleukin 1β and tumor necrosis factor ɑ in cartilage tissue was lower than that of normal group(P＜0.05).To conclude,internal tension-reduction technique can delay the degeneration of articular cartilage in Yunnan small-eared pigs following anterior cruciate ligament reconstruction.

Objective To investigate the expression of histone deacetylase(HDAC)isoforms in the frontal lobe,hippo-campus and liver of offspring rats delivered by rats with maternal immune activation and their correlation with the efficiency of prepulse inhibition(PPI％).Methods Ten pregnant Sprague-Dawley rats were randomly divided into the model group(n=5)and control group(n=5).The rats in the model group were injected with 10 mg·kg-1 polyinosinic-polycytidylic acid(Poly I:C)via the caudal vein on the 9th day of pregnancy,while rats in the control group were given the same volume of sterile physiological saline.After 3 h,blood was collected from the caudal vein,and the levels of interleukin(IL)-1 β,IL-6 and tumor necrosis factor-α(TNF-α)in the plasma of pregnant rats were detected by enzyme-linked immunosorbent assay to evaluate the immune activation status.The pregnant rats in the two groups were fed until natural delivery,the offspring rats were weaned on the 21st day after birth,and the male offspring rats were fed continuously.A prepulse inhibition test was performed at puberty(the 40th day after birth)to evaluate the spatial recognition memory and sensory gating function of the offspring rats.The expression levels of the HDAC gene family in the hippocampus,frontal lobe and liver of offspring rats were detected by real-time fluorescence quantitative polymerase chain reaction.Results The plasma IL-6,IL-1 β and TNF-α levels in the model group were significantly higher than those in the control group(P＜0.05).When the prepulse stimulation was 75 dB,the PPI％of the offspring rats at puberty in the model group was significantly lower than that in the control group(P＜0.05).When the prepulse stimulation was 80 and 85 dB,there was no significant difference in PPI％between the model group and the control group(P＞0.05).In the frontal lobe,the expression levels of HDAC3,HDAC4,HDAC8,HDAC9,HDAC10 and Sirt mRNA in the offspring rats in the model group were significantly lower than those in the control group(P＜0.05),while the expression level of HDAC5 mRNA was significantly higher than that in the control group(P＜0.05);there were no significant differences in the expression levels of HDAC1,HDAC2,HDAC6,HDAC7 and HDAC11 mRNA between the model group and the control group(P＞0.05).In the hippocampus,the offspring rats in the model group had significantly lower expression levels of HDAC1,HDAC8 and HDAC10 mRNA and significantly higher expression levels of HDAC2 and HDAC5 mRNA than those in the control group(P＜0.05);there were no significant differences in the expression levels of HDAC3,HDAC4,HDAC6,HDAC7,HDAC9,HDAC11 and Sirt mRNA between the model group and control group(P＞0.05).In the liver tissue,the expression levels of HDAC6 and HDAC10 mRNA of the offspring rats in the model group were significantly lower than those in the control group(P＜0.05);there were no significant differences in the expression levels of HDAC1,HDAC2,HDAC3,HDAC4,HDAC5,HDAC7,HDAC8,HDAC9,HDAC11 and Sirt mRNA between the model group and the control group(P＞0.05).The expression level of HDAC2 mRNA in the hippocampus of offspring rats in the two groups was negatively correlated with PPI％at 75 dB(r=-0.965,P＜0.05),the expression levels of HDAC10 and Sirt mRNA in frontal lobe tissues were positively correlated with PPI％at 75dB(r=0.946,0.925;P＜0.05).Conclusion Pregnancy Poly I:C infection has significant effects on the expression of HDAC family proteins in offspring rats,and which is related to the impairment of early sensory gating,this may provide new ideas for the research in pathogenesis and drug treatment of schizophrenia.

Objective To empirically analyze the status quo of high-quality development of public hospitals in S Province,provides reference for promoting high-quality development of public hospitals.Methods SPSS 26.0 soft-ware and text analysis method were used to process the high-quality development monitoring data of tertiary public hospitals in S Province,and the qualitative interview results obtained by field investigation were comprehensively ana-lyzed.Results In terms of capacity improvement,public hospitals actively take measures such as the construction of medical union and the reform of payment methods to improve their capacity.Specialized hospitals and maternity and child care hospitals need to be improved in some indicators.In terms of structural optimization,the quality of medi-cal services is high in all regions.The proportion of medical service revenue and the proportion of high-grade surgery still need to be increased.In terms of innovation and efficiency improvement,the application level of electronic medi-cal records has made remarkable progress in various regions.There are differences in the funding of scientific re-search projects.In terms of cultural cohesion,patient satisfaction was higher.There is improvement room in the satisfaction of medical staff.Conclusion Third-level public hospitals in S province have achieved certain results in high-quality de-velopment,but there are still problems,such as the need to further integrate party building work with hospital busi-ness work,the lack of connection between performance incentive and performance evaluation index system,and the need to improve the satisfaction of medical staff.It is necessary to solve the problem and improve the quality and efficiency of medical service.

Objective To empirically analyze the status quo of high-quality development of public hospitals in S Province,provides reference for promoting high-quality development of public hospitals.Methods SPSS 26.0 soft-ware and text analysis method were used to process the high-quality development monitoring data of tertiary public hospitals in S Province,and the qualitative interview results obtained by field investigation were comprehensively ana-lyzed.Results In terms of capacity improvement,public hospitals actively take measures such as the construction of medical union and the reform of payment methods to improve their capacity.Specialized hospitals and maternity and child care hospitals need to be improved in some indicators.In terms of structural optimization,the quality of medi-cal services is high in all regions.The proportion of medical service revenue and the proportion of high-grade surgery still need to be increased.In terms of innovation and efficiency improvement,the application level of electronic medi-cal records has made remarkable progress in various regions.There are differences in the funding of scientific re-search projects.In terms of cultural cohesion,patient satisfaction was higher.There is improvement room in the satisfaction of medical staff.Conclusion Third-level public hospitals in S province have achieved certain results in high-quality de-velopment,but there are still problems,such as the need to further integrate party building work with hospital busi-ness work,the lack of connection between performance incentive and performance evaluation index system,and the need to improve the satisfaction of medical staff.It is necessary to solve the problem and improve the quality and efficiency of medical service.

Objective To empirically analyze the status quo of high-quality development of public hospitals in S Province,provides reference for promoting high-quality development of public hospitals.Methods SPSS 26.0 soft-ware and text analysis method were used to process the high-quality development monitoring data of tertiary public hospitals in S Province,and the qualitative interview results obtained by field investigation were comprehensively ana-lyzed.Results In terms of capacity improvement,public hospitals actively take measures such as the construction of medical union and the reform of payment methods to improve their capacity.Specialized hospitals and maternity and child care hospitals need to be improved in some indicators.In terms of structural optimization,the quality of medi-cal services is high in all regions.The proportion of medical service revenue and the proportion of high-grade surgery still need to be increased.In terms of innovation and efficiency improvement,the application level of electronic medi-cal records has made remarkable progress in various regions.There are differences in the funding of scientific re-search projects.In terms of cultural cohesion,patient satisfaction was higher.There is improvement room in the satisfaction of medical staff.Conclusion Third-level public hospitals in S province have achieved certain results in high-quality de-velopment,but there are still problems,such as the need to further integrate party building work with hospital busi-ness work,the lack of connection between performance incentive and performance evaluation index system,and the need to improve the satisfaction of medical staff.It is necessary to solve the problem and improve the quality and efficiency of medical service.

Objective To empirically analyze the status quo of high-quality development of public hospitals in S Province,provides reference for promoting high-quality development of public hospitals.Methods SPSS 26.0 soft-ware and text analysis method were used to process the high-quality development monitoring data of tertiary public hospitals in S Province,and the qualitative interview results obtained by field investigation were comprehensively ana-lyzed.Results In terms of capacity improvement,public hospitals actively take measures such as the construction of medical union and the reform of payment methods to improve their capacity.Specialized hospitals and maternity and child care hospitals need to be improved in some indicators.In terms of structural optimization,the quality of medi-cal services is high in all regions.The proportion of medical service revenue and the proportion of high-grade surgery still need to be increased.In terms of innovation and efficiency improvement,the application level of electronic medi-cal records has made remarkable progress in various regions.There are differences in the funding of scientific re-search projects.In terms of cultural cohesion,patient satisfaction was higher.There is improvement room in the satisfaction of medical staff.Conclusion Third-level public hospitals in S province have achieved certain results in high-quality de-velopment,but there are still problems,such as the need to further integrate party building work with hospital busi-ness work,the lack of connection between performance incentive and performance evaluation index system,and the need to improve the satisfaction of medical staff.It is necessary to solve the problem and improve the quality and efficiency of medical service.

Objective To empirically analyze the status quo of high-quality development of public hospitals in S Province,provides reference for promoting high-quality development of public hospitals.Methods SPSS 26.0 soft-ware and text analysis method were used to process the high-quality development monitoring data of tertiary public hospitals in S Province,and the qualitative interview results obtained by field investigation were comprehensively ana-lyzed.Results In terms of capacity improvement,public hospitals actively take measures such as the construction of medical union and the reform of payment methods to improve their capacity.Specialized hospitals and maternity and child care hospitals need to be improved in some indicators.In terms of structural optimization,the quality of medi-cal services is high in all regions.The proportion of medical service revenue and the proportion of high-grade surgery still need to be increased.In terms of innovation and efficiency improvement,the application level of electronic medi-cal records has made remarkable progress in various regions.There are differences in the funding of scientific re-search projects.In terms of cultural cohesion,patient satisfaction was higher.There is improvement room in the satisfaction of medical staff.Conclusion Third-level public hospitals in S province have achieved certain results in high-quality de-velopment,but there are still problems,such as the need to further integrate party building work with hospital busi-ness work,the lack of connection between performance incentive and performance evaluation index system,and the need to improve the satisfaction of medical staff.It is necessary to solve the problem and improve the quality and efficiency of medical service.

Objective To empirically analyze the status quo of high-quality development of public hospitals in S Province,provides reference for promoting high-quality development of public hospitals.Methods SPSS 26.0 soft-ware and text analysis method were used to process the high-quality development monitoring data of tertiary public hospitals in S Province,and the qualitative interview results obtained by field investigation were comprehensively ana-lyzed.Results In terms of capacity improvement,public hospitals actively take measures such as the construction of medical union and the reform of payment methods to improve their capacity.Specialized hospitals and maternity and child care hospitals need to be improved in some indicators.In terms of structural optimization,the quality of medi-cal services is high in all regions.The proportion of medical service revenue and the proportion of high-grade surgery still need to be increased.In terms of innovation and efficiency improvement,the application level of electronic medi-cal records has made remarkable progress in various regions.There are differences in the funding of scientific re-search projects.In terms of cultural cohesion,patient satisfaction was higher.There is improvement room in the satisfaction of medical staff.Conclusion Third-level public hospitals in S province have achieved certain results in high-quality de-velopment,but there are still problems,such as the need to further integrate party building work with hospital busi-ness work,the lack of connection between performance incentive and performance evaluation index system,and the need to improve the satisfaction of medical staff.It is necessary to solve the problem and improve the quality and efficiency of medical service.

Objective To empirically analyze the status quo of high-quality development of public hospitals in S Province,provides reference for promoting high-quality development of public hospitals.Methods SPSS 26.0 soft-ware and text analysis method were used to process the high-quality development monitoring data of tertiary public hospitals in S Province,and the qualitative interview results obtained by field investigation were comprehensively ana-lyzed.Results In terms of capacity improvement,public hospitals actively take measures such as the construction of medical union and the reform of payment methods to improve their capacity.Specialized hospitals and maternity and child care hospitals need to be improved in some indicators.In terms of structural optimization,the quality of medi-cal services is high in all regions.The proportion of medical service revenue and the proportion of high-grade surgery still need to be increased.In terms of innovation and efficiency improvement,the application level of electronic medi-cal records has made remarkable progress in various regions.There are differences in the funding of scientific re-search projects.In terms of cultural cohesion,patient satisfaction was higher.There is improvement room in the satisfaction of medical staff.Conclusion Third-level public hospitals in S province have achieved certain results in high-quality de-velopment,but there are still problems,such as the need to further integrate party building work with hospital busi-ness work,the lack of connection between performance incentive and performance evaluation index system,and the need to improve the satisfaction of medical staff.It is necessary to solve the problem and improve the quality and efficiency of medical service.