BACKGROUND:In terms of the histocompatibility, immune rejection and scar formation after repair, acel ular nerve al ograft is closer to autologous nerve cel s. At present, hyaluronic acid has been applied for autologous peripheral nerve repair;however, research on the nerve al ograft is rarely reported.
OBJECTIVE:To explore the effect of hyaluronic acid on the anastomotic scar in acel ular nerve al ograft repair of rat sciatic nerve defect.
METHODS:Thirty-six Sprague-Dawley rats were randomly divided into three groups (n=12 per group). The rat model of nerve defect of 10 mm was established by cutting the sciatic nerve of the left hind leg and then given nerve al ograft combined with the injection of hyaluronic acid at anastomosis (experimental group), only nerve al ograft (control group) and autologous nerve graft (nerve autograft group), respectively. Afterwards, the healing of the proximal anastomosis was observed and scar components were assessed.
RESULTS AND CONCLUSION:Gross observations showed that the rat skin and muscle fascia had no significant differences in healing among groups, while the surrounding tissue adhesion in the experimental group was milder than that in the control group (P<0.05). Masson staining found that col agen deposition in the epinerium could be observed in each group. In the experimental group, a smal amount of col agen fibers arranged orderly in the epineurium;in the control group numerous col agen fibers accumulated and arranged irregularly;in the nerve autograft group, sparse epineurial col agen fibers appeared in an order arrangement. The gray value of col agen type I in the experimental group was higher than that in the control group (P<0.05), while the gray value of col agen type III was lower than that in the control group (P<0.05). No significant differences were found in the sum gray values of col agen type I and III among groups (P>0.05). These findings indicate that in the peripheral nerve repair, hyaluronic acid abrogates the scar formation by increasing the deposition of col agen type III and reducing the deposition of col agen type I.

Objective To explore the MR imaging of reverse and separation of meniscal articular capsule.Methods MR imaging of reverse and separation of meniscus articular capsule confirmed by surgery and arthroscope were analyzed retrospectively in 8 cases.Results The “Butterfly knot sign” disappeared and was replaced with fluid signal on the sagittal slice of meniscal body in 8 cases. Part of back angle remained in 3 cases. “Double anterior cruciate ligament sign” was showed on one side of middle sagittal slice in 7 cases. “Reverse meniscus sign” was revealed in intercondylar fossa on the coronary view in ~8 cases. Abnormal high signal was showed in the injured meniscus in 6 cases. Abnormal high signal was detected in the opposite meniscus in 5 cases.Conclusion The MR findings of reverse and separation of meniscus articular capsule include disappearance of “butterfly knot sign”, appearance of “reverse meniscus sign” and “double anterior cruciate ligament sign”. The diagnosis would be established if the former 2 signs were present or all the 3 signs were present simultaneously.

Objective To establish the quality standards of Gualou Guizhi Dropping Pills; To investigate the vitro dissolution. Methods HPLC was used to determine the contents of paeoniflorin, albiflorin, cinnamic acid, 6-gingerol, liquiritin, glycyrrhizic acid and liquiritigenin in the dropping pills. The vitro dissolution rate of dropping pills was determined by rotating basket method. Results The calibration curves of paeoniflorin and albiflorin were in a good linearity in the range of 0.690–6.900 μg, 0.300–2.996 μg, respectively, and the average recoveries were 101.12% and 98.52%, respectively, with RSD of 2.24%, 1.37%, respectively. Cinnamic acid was linear in the range of 0.023–0.348 μg and the average recovery was 98.21% with RSD of 2.00%. 6-Gingerol was linear in the range of 0.025–0.382 μg, and the average recovery was 99.19% with RSD of 2.18%. The calibration curves of liquiritin, glycyrrhizic acid and liquiritigenin were in a good linearity in the ranges of 0.120–2.498 μg, 0.150–2.253 μg, and 0.010–0.147 μg, respectively, and the average recoveries were 99.80%, 100.38%, and 100.62%, respectively with RSD of 2.10%, 1.91%, 1.66%, respectively. The accumulated dissolution rates of seven kinds of elements in the dropping pills all reached more than 98% in 15 min. Conclusion The method is simple and accurate, with repeatability, which can be applied to the quality control of Gualou Guizhi Dropping Pills. The vitro dissolution rates meet relevant standards.

Objective To study the nasal mucosa absorption of paeonol ofXingbi microemulsion-based thermo-sensitive gel in rats; To evaluate the nasal mucosa absorption of medicine and the rationality of preparation form.Methods According to the nasal administration method, the blood medicine concentration of paeonol was determined at different time points.Results The nasal administration bioavailability of paeonol in Xingbi microemulsion-based thermo-sensitive gel was 78.68%, the plasma concentration reached the maximum (0.3404 μg/mL) after 3 min of administration, and the average residence time was 9.23 h. After reaching Cmax, The plasma concentration changed similar to intravenous administration of paeonol. The concentration data of paeonol in plasma was consistent with a two-compartment model, with a weight of 1.Conclusion Xingbi microemulsion-based thermo- sensitive gel has a higher bioavailability, and the preparation form was reasonable.

Objective To investigate the effects of Gualou Guizhi Granules on excitatory toxic damage of PC12 induced by glutamate; To primarily explore the involved protective mechanism of Gualou Guizhi Granules. Methods Excitatory toxic damage of PC12 induced by glutamate was used to establish models. Cells were divided into normal group, glutamate group, and Gualou Guizhi Granules low- (200 μg/mL), medium- (400 μg/mL) and high-dose (800 μg/mL) groups. MTT and LDH assay methods were used to detect PC12 activity; Caspase-3 activity detection method and Annexine V/PI double staining method were used to detect cell apoptosis; Western blot and RT-PCR were used to detect Bcl-2, Bax protein and mRNA expression. Results Compared with glutamate group, MTT showed that all Gualou Guizhi Granules groups could improve PC12 activity, and LDH showed that cell activity in all Gualou Guizhi Granules groups decreased; Annexine V/PI double staining method showed that all Gualou Guizhi Granules groups could decrease the PC12 apoptosis; Caspase-3 activity detection method showed that all Gualou Guizhi Granules groups could decrease the activity of Caspase-3; Western blot and RT-PCR showed that all Gualou Guizhi Granules groups could reduce Bax expression and increase Bcl-2 expression. Conclusion Gualou Guizhi Granules have certain protective effects on excitatory toxic damage of PC12 induced by glutamate, which may be related to its anti-apoptotic activity.

Humans ; Siblings ; Gene Frequency ; Microsatellite Repeats

A sagittal plane model of knee joint based on crossed-four-bar-linkage-based tibiofemoral joint model has been developed using geometric and force equilibrium constraints. The model predicts and explains the movement of contact point on the patella and femur, variation of patellar and patellar tendon angle, variation of patellar mechanism angle and variation of patellofemoral contact force and patellar tendon force. The computed results agree well with the published experimental results.
Biomechanical Phenomena ; Humans ; Knee Joint ; anatomy & histology ; physiology ; Models, Biological ; Movement ; physiology ; Patella ; anatomy & histology ; physiology

Some 3D finite element systemic models are currently established and used to simulate the foot biomechanical state. However, during most of these 3D foot finite element static analyses, ligaments and plantar fascia are generally defined by connecting the corresponding attachment points on the bones, and the spaces between the bones are fused together by solid elements with given cartilage stiffness to simulate the connection of bones. This "connection of bones" takes the place of the real interactions between neighbored bones and enhances the structure of foot, which possibly leads to the result that the effects of ligaments and other soft tissues are completely replaced by the effect of articular cartilages. Thereby, ligaments and other soft tissues maybe not play an inherent role in the finite element analysis. The objective of this study was to estimate whether there exists the effect of ligaments and plantar fascia on the biomechanical behaviors of the foot tissue stress distribution and foot structure deformation during the balanced standing stance and static finite element analysis.
Adult ; Biomechanical Phenomena ; Computer Simulation ; Fascia ; physiology ; Foot ; diagnostic imaging ; physiology ; Humans ; Ligaments ; physiology ; Male ; Models, Biological ; Radiography ; Stress, Mechanical

Objective To explore the outcomes of computer-assisted design of therapeutic personalized footwear for diabetic foot.Methods Fifty-eight cases of diabetic foot were included in the study.Ten items of data from theses patients were measured with methods provided by Salford University.All characteristics of the footwear were calculated with computer.Shoes were specially designed with the formula and computational method provided by Safford university.All patients had worn the shoes for 13 months.Special questionnaires were used to measure the outcomes.Results Thirty-two cases had been followed up for one month,25 cases for 2 months,25 cases for 3 months and 42 cases for 13 months.The score had improved from 67.94±15.14 before wearing the shoes to 78.13±1.44 thirteen months after wearing.The health score of the foot had improved.There was significant difference between before and after wearing the footwears.Conclusion Special-designed diabetic shoes play an important role in the prevention of ulcer for diabetic foot patients.Computational method and data model obtained from Salford university needs to be modified when applying it for Chinese.

Objective To determine the epidemiological and etiological characteristics of hand，foot，and mouth disease （HFMD） in Pujiang County from 2008 through 2020， so as to provide scientific evidence for prevention and control measures. Methods Descriptive epidemiological analysis was used to analyze HFMD cases retrieved in the Chinese Information System for Disease Control and Prevention in Pujiang County during 2008‒2020. Results From 2008 through 2020， a total of 9 393 cases were documented in Pujiang County， with an annual incidence of 182.3 per 100 000， showing a trend of alternating high-incidence and low-incidence years. The seasonal distribution was bimodal， and the incidence peaked in May-July and November-December. The incidence of HFMD in urban areas was significantly higher than that in rural areas， and the incidence was positively correlated with population density. Majority of cases （94.9%） were children under 5 years old， of which boys had higher incidence than girls. The number of documented cases was the highest among preschool children living in families and kindergartens， accounting for 97.3%. Totally， 558 cases were laboratory confirmed in Pujiang County in 2008-2020， of which severe cases were all caused by EV71 infection. Conclusion Enterovirus serotypes in HFMD have continually changed from 2008 through 2020 in Pujiang County. However， severe HFMD remains principally attributable to EV71 infection， suggesting that it is necessary to strengthen the surveillance on the etiology of HFMD. In addition， it warrants further promotion of EV71 vaccination.