BACKGROUND: The biomechanical property(BP) of the bone is decided by its geometric structure and component material. Merely pursuing increase of the bone mineral density(BMD) might lead to deterioration of bone BP.However at present, some researohes on therapeutic action on osteoporosis emphasize excessively medical influence to BMD, and the change in the holistic BP of the bone in osteoporotic zone and its mechanism still need to investigate deeply.OBJECTIVE: To probe into the action and its mechanism of "the kidney tonifying compound of the Traditional Chinese Medical (TCM) "on BP of cortical bone in ovariectomized osteoporotic model rats.DESIGN: Completely randomized controlled experiment based on experimental animals.SETTING: Laboratory of Biomedical Engineering, Luoyang Hospital and Institute of Traditional Chinese Orthopedics and Traumatology in Henan Province.MATERIALS: The experiment was completed from November 2000 to July 2001 at Research Laboratory of Biomedical Engineering,Luoyang Institute of Traditional Chinese Orthopedics and Traumatology of Henan Province. The healthy Wistar female rats aged 10 months,weighing(350±20) g.METHODS: Fifty Whistar female rats aged 10 months were randomly divided into 5 groups: the normal, model, premarin-treated, xianling gubao-treated and migu capsule-treated with 10 in each group. The normal group was only given sham operation and the other four groups were ovariectomized. The rats after operation were fed normally for ninety days.Since the 91st day after operation,the rats had been given the medicines for 90 days and then killed. The thighbones were taken out,then BMD,femoral geometry sizes and BP were determined.MAIN OUTCOME MEASURES: ① The primary sequel was the comparison of the parameters of femoral BP. ② The secondary sequel was the changes in parameters of femoral geometric structure, area of cortical bone and BMD of every midsectional fomur.RESULTS: Femoral BP worsened significantly,its mechanical intensity reduced,its external diameter diminished,cortical bone area decreased and femoral BMD lowered in osteoporotic model rats. In comparison with the above,in "the kidney tonifying compound ofTCM " groups(migu capsule group and xianling gubao group) femoral BP raised significantly, its mechanical intensity advanced,its external diameter augmented,cortical bone area aggrandized and femoral BMD enhanced.CONCLUSION: "The kidney tonifying compound of TCM" can improve BP of the cortical bone(thighbone) in ovariectomized osteoporosis rats. Its primary mechanism of action is that the TCM compound prescription could enhance"the mechanism of biomechanical response and regulation"(MBRR) of macrostructure of cortical bone,consequently increase femoral external diameter,aggrandize cortical bone area and enhance BMD in ovariectomized rats.

Objective To evaluate the role of C-type lectin domain family 2,member B (CLEC2B) gene in the pathogenesis of vitiligo.Methods Real time fluorescence-based PCR was performed to detect the expression of CLEC2B mRNA in the peripheral blood and lesional skin of 37 patients with vitiligo as well as in the peripheral blood and normal skin of 40 healthy controls.Data were statistically analyzed by t test and chisquare test.Results Among the 37 patients,23 had progressive vitiligo,14 stable vitiligo,31 vitiligo vulgaris,6 segmental vitiligo.The expression level of CLEC2B mRNA was significantly higher in vitiligo lesions than in the control skin (1.21 ± 0.03 vs.1.00,t =4.432,P ＜ 0.05),but was of no significant difference in peripheral blood between the patients and healthy controls (1.02 ± 0.05 vs.1.00,t =1.435,P ＞ 0.05).Increased expression of CLEC2B mRNA was noted in lesions of vulgaris vitiligo compared with those of segmental vitiligo (1.21 ± 0.03 vs.1.02 ± 0.01,t =5.330,P ＜ 0.05),as well as in lesions of progressive vitiligo compared with those of stable vitiligo (1.25 ± 0.05 vs.1.08 ± 0.03,t =3.046,P ＜ 0.05).No significant difference was observed in the expression of CLEC2B mRNA among lesions of vitiligo with different courses (P ＞ 0.05).Conclusion The differential expression of CLEC2B mRNA may take part in the pathogenesis of vitiligo.

We have evaluated the plague epidemic situation in the Three Rivers Source Region,Qinghai Province in recent 20 years to provide the basis for revising the plague prevention countermeasures.We have analyzed the time distribution and the plague epidemic situation between animals and human beings during twenty years in the Three Rivers Source Region,Qinghai Province by describing epidemiology.The animal plague in the natural source of Marmot plague was extremely serious in the Three Rivers Source Region during the past 20 years.It mainly distributes in Yushu State and Tanggula County,Germu City and the serious season ran through the whole period of marmot camp ground activities and the peak was between June and August.Human plague epidemic took place between May and October each year and reached its peak between July and September.The peak covered about 41.67％ at most.It mainly endemic distributes in Nangqian and Xinghai Country.During the past 20 years,we have totally found 14 human plague epidemics in the Three Rivers Source Region,among which 48 cases took place and there were deaths of 17 cases.The fatality rate was 35.42％.The lung type was the majority among 48 cases,which startde with the glandular type.During the past 20 years the plague epidemic has been active and the animal plague epidemic broke out continuously in the Three Rivers Source Region,Qinghai Province.The variety of animals and insects infected the plague epidemic was increasing.The human plague epidemics is most serious with high fatality rate,but it is on the decline as a whole.

Objective:To investigate the ultrasonographic features and prognosis of fetal vascular anomalies.Methods:Thirty-one fetuses with vascular anomalies diagnosed from June 2013 to August 2018 in Changsha Hospital for Maternal and Child Health Care were retrospectively analyzed. The location, size, shape, internal echo and blood flow distribution of the lesions were observed by ultrasound carefully, and the prognosis was followed up and analyzed.Results:Among the 31 cases of fetal vascular anomalies, 10 cases were comfirmed by autopsy after induced labor, and 21 cases were confirmed by postpartum local observation or surgery and pathology. Among them, there were 4 cases of Klippel-Trenaunay syndrome (including 1 case of Parkes-Weber syndrome), 3 cases of hemangioma, 1 case of primary congenital lymphedema and 23 cases of lymphangioma. Thirty-one cases showed lesions coincident with ultrasound localization and diagnosis, including 9 cases of head and neck lesions, 15 cases of trunk lesions, 1 case of upper limb lesion and 6 cases of lower limb lesions. The blood flow spectra of arteriovenous fistulas were found in 3 cases of fetal lesions and no obvious blood flow signals were found in 28 cases of fetal lesions.Conclusions:Prenatal ultrasound examination and follow-up play an important role in the diagnosis and prognostic prediction of fetal vascular diseases. The prognosis of fetal vascular diseases is closely related to the location, size, effect on the surrounding tissue and shunt volume of the lesion.

OBJECTIVE: To analyze the etiology and prevention of complications related to the pedicle screw technique in the treatment of thoracic scoliosis. METHODS: There were 183 thoracic deformity patients 110 idiopathic scoliosis, 32 adult scoliosis, 28 congenital kyphoscoliosis, 8 Marfan syndrome with scoliosis, and 6 others. All patients' Cobb angles were evaluated preoperatively, intraoperatively, and postoperatively by roentgenograms. The deformity correction rate was calculated. All radiographic evaluations were carried out in a double-blind fashion. The complication rate was analyzed perioperatively and postoperatively. RESULTS: The deformity correction rate was 72%, better than others treated with hook-rod system. The perioperation complication rate was 8.4% (pedicle fracture 1.5%, infection 3.8%, pneumothorax and plural effusion 1.6%, transitory neurological damage 0.5%, and over-bleeding shock 1%). The complication rate at follow-up was 3.6% (infection 0.5%, fatigue fracture 1%, loss of deformity correction 1.6%, and transitory neurological damage 0.5%). Compared with those treated with hook-rod system, the perioperation complication rate, loss of deformity correction, permanent damage, and complications related to the internal fixation were all low. CONCLUSION The complication rate of pedicle screw fixation system was low in the treatment of thoracic deformity. When surgeons are thoroughly familiar with the technique and related pathoanatomy, and with the spinal cord function wardship by SEP, complications related to the pedicle screw technique in the treatment of thoracic scoliosis will be well controlled.
Adolescent ; Adult ; Bone Screws ; adverse effects ; Child ; Child, Preschool ; China ; epidemiology ; Female ; Humans ; Internal Fixators ; adverse effects ; Male ; Middle Aged ; Orthopedic Procedures ; methods ; Postoperative Complications ; epidemiology ; prevention & control ; Scoliosis ; surgery ; Spinal Fusion ; instrumentation ; Thoracic Vertebrae ; surgery ; Young Adult

Objective:To investigate the contents of soil metal elements in the plague high incidence area and resting area in the plague natural foci of Qingnan region in Qinghai Province, and to compare and analyze the differences of the contents of soil metal elements between the two areas.Methods:A total of 69 soil samples were collected from 11 sites in the plague high incidence area (Yushu Prefecture) and resting area (Guoluo Prefecture) in Qingnan region, including 39 samples from high incidence area and 30 samples from resting area. The contents of 12 soil metal elements, such as iron (Fe), magnesium (Mg), calcium (Ca), barium (Ba), cobalt (Co), copper (Cu), manganese (Mn), lead (Pb), rubidium (Rb), titanium (Ti), vanadium (V) and zinc (Zn), were measured by X-ray fluorescence spectrometry and SPSS 20.0 software was used for Spearman correlation and other statistical analysis.Results:The contents of Fe and Ca in the soil of the plague natural foci of Qingnan region were relatively high. The contents of 12 soil metal elements in the high incidence area were significantly higher than those in the resting area ( P < 0.01 or < 0.05). There were statistical significant differences in the contents of Mg, Ca, Ba, Mn, Pb and Zn in the soil among the sample plots of the plague high incidence area ( P < 0.01 or < 0.05). There were statistical significant differences in the contents of Fe, Mg, Ca, Rb and Ti in the soil among the sample plots of the plague resting area ( P < 0.05 or < 0.01). Except for Mg and Ca, Fe was positively correlated with other metal elements in the high incidence area and resting area ( P < 0.01 or < 0.05), and Fe was strongly positively correlated with Rb, Ti and V ( r = 0.780 - 0.838). Mg was only positively correlated with Ca in the high incidence area and resting area ( P < 0.01). Ca was negatively correlated with Mn, Pb, Rb, Ti, V and Zn in the high incidence area, and with Rb and Zn in the resting area ( P < 0.01 or < 0.05). The rest of the metal elements were mostly positively correlated in the high incidence area and resting area. Conclusions:The contents of Fe and Ca are rich in the plague natural foci of Qingnan region in Qinghai Province. There are correlations among most soil metal elements in the high incidence area and resting area. The correlation between the contents of soil metal elements in the plague natural foci and the epidemic of plague is worth further exploring.

Objective: To evaluate the efficiency of clear aligners in treating bimaxillary protrusion patients with first premolar extractions. Methods: Eleven patients with bimaxillary protrusion were selected in this study. All of them were treated by using clear aligners with four first premolar extractions and need maximal anchorage. Cephalometric analysis was carried out before and after treatment. Results: Cephalometric analysis results showed that significant changes in teeth and profile could be detected after clear aligner treatment and no change could be found in skeletal pattern. Upper and lower anterior teeth were retracted. The control of anterior torque and posterior anchorage were effective. The soft tissue analysis showed that position of upper and lower lip was significantly changed which improve the profile of patients. After treatment, the distance of U1 to NA and L1 to NB reduced by (5.19±4.12) mm and (4.53±1.20) mm, respectively. The differences were statistically significant (P<0.01). Conclusions Bimaxillary protrusion patients who needed premolar extractions and maximal anchorage could be treated with clear aligners.