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Objective@#To analyze the mental health status of clinical medical standardized training graduate students (referred to as: graduate students).@*Methods@#Through the online questionnaire, the Symptom Checklist (SCL-90), adult psychological stress scale, and occupational satisfaction were used to compare the first affiliated hospital of Bengbu Medical College from January 2018 to June 2019. 498 graduate students of the Department of Neurology, the Second Affiliated Hospital of Bengbu Medical College and the Third People’s Hospital of Bengbu City, and 420 medical non-regular graduate students conducted a survey on the status of psychological stress and statistical analysis of the results.@*Results@#The psychological stress of graduate students(40.28±10.43) was significantly higher than that of non-regular graduate students(36.95±5.13)， and the psychological stress of male students(41.75±11.17) in medical disciplines was significantly higher than that of female students(38.81±9.43). The difference was statistically significant(t=2.44，3.16，P<0.05); There was no significant difference in the occupational satisfaction scores between the two groups(t=1.94，1.27，P>0.05). The SCL-90 factor evaluation results of graduate students were significantly higher than those of non-regular graduate students. The scores of depression, anxiety and terror factor of male students in the graduate students were significantly higher than those of girls, and the differences were statistically significant(P<0.05).@*Conclusion@#The mental health status of postgraduates in clinical medicine is generally poor, and the mental health of boys is worse than that of girls.
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Objective To determine the effects of the two kinds of pedicle screws with cement augmentation used for in vitro sheep osteoporotic vertebra model. Method Forty osteoporosis specimens of lumbar vertebrae demineralized by decalcification solution were complete randomly devided into four groups including Group A (only screw),Group B (whole trajectory filled with PMMA),Group C1(partial trajectory filled with PMMA) and Group C2 (partial trajectory filled with PMMA). Osteoporosis specimens from four groups were tested by bone mineral density (BMD) and observed by spiral CT and MicroCT. The maximum force and energy absorption of pedicle screw were tested. Results BMD in each group were averagely declined about 25%～30% (P>0.05), so osteoporotic vertebrae model was successfully established.Spiral CT and MicroCT showed that screw of Group B was fully surrounded by PMMA, which constituted screw PMMA-bone interface,while screw of Group C2 was partially surrounded by PMMA, which constituted partial screw-bone and partial screw PMMA-bone interface. The axial pull-out test showed that the maximum force (Fmax) and its energy absorption in Group B, C1,2 were significantly higher than those in Group A（P0.05). Conclusions Both the whole and partial pedicle screw augmentation can significantly improve the strength of pedicle screw in the context of osteoporosis. The latter not only formed a special whole interface consisting of partial “screw-bone” and partial screw-CSC-bone interface,but produced the strengthening effect equivalent to the former by increasing injection doses of PMMA.