Objective To determine how often the line joining both iliac crests intersects the spine at L3,4 interspace or L4 spinous process.Methods One hundred and eighty-four patients aged 24-82 yr weighing 50-80 kg scheduled for spine surgery were placed in left lateral position with their hips and knees flexed.A line joining both iliac crests was drown.A metal marker was placed at the point where the intercristal line intersects the spine and detected by mobile X-ray system.The intersection was considered accurately located when the marker lay on L3,4 interspace or L4 spinous process.The rate of inaccuracy was calculated.Results The intercristal line lay between L2,3 interspace and L5 spinous process and lay more cephalad in male than in female.The inaccuracy rate was 18％.Conclusion The location of intersection of intercristal line and spine should be checked cautiously before lumbar puncture.

Objective: To optimize a preparation technology for pyretic arthralgia cataplasma. Methods: The preparation technology were studied by a uniform design experiment in which NP-700, tartaric acid, PVP, dihydroxyaluminum aminoacetate, glycerol, water and medicinal powder were factors and viscosity, infiltration, gel mobility and gel strength were indices. Results: The best ratio of this cataplasma matrix was NP-700:tartaric acid:PVP:dihydroxyaluminum aminoacetate: glycerol:water:powder = 4.0:0.2:1.0:0.1:25.0:35.0:2.0. According to optimized formula, to prepare the poultice, then to spread the poultice uniformly onto non-woven fabrics, cover CPP membrane and pack after 1 week at room temperature. Conclusion: Pyretic arthralgia cataplasma was well moldable and its process technology was feasible.

In order to meet the requirements of medical teaching contents and curriculum system reform, we adopt the experience ofHarvard University School of Medicine to integrate Biochemistry and Cell Biology into a new one—— "Chemistry and Biology of theCell". We have carried out the integration of the two courses three times. In this new course, repeated contents have been reduced, thelinkage of the two courses has been increased, and the burden of students was lightened,which makes students contact the clinic earlierand enables to improve the students' ability to solve problems.

The finite element model of the intact lumbar spine (L1-L5) was set up to study the biomechanical changes of three different pairs of the lumbar laminectomy. The three-dimensional finite elements model of L1-L5 vertebrae structure was constructed by the combination of self-compiled software and Hyper Mesh. The finite element model was compared with the experimental data in vitro. The finite element model was modified of stenosis at L3-L4 and L4-L5 with the same boundary conditions and physical loads to study the motion and loading in the annulus changes at the surgical site as a result of surgical alteration. The study suggested that the removal of posterior lumbar spinal elements for the treatment of stenosis at L3-L4 and L4-L5 produced a graded increase in motion at the surgical site, with the greatest changes occurring in flexion-extension and axial rotation and that during lateral bending the amount of resection was only slightly affected. The data showed that for flexion-extension and axial rotation the increases in motion were correlated to the extent of posterior element removal. It is necessary to retain the greatest degree of posterior lumbar structures in thorough decompression, which can further reduce the postoperative intervertebral disc, facet degeneration.
Adult ; Biomechanical Phenomena ; Computer Simulation ; Finite Element Analysis ; Humans ; Laminectomy ; methods ; Lumbar Vertebrae ; diagnostic imaging ; surgery ; Male ; Models, Biological ; Spinal Stenosis ; diagnostic imaging ; surgery ; Tomography, Spiral Computed