Method:Compression tests with electronic experimental instrument(Model CSS-2205) were performed with 49 standardized test sites in 55 bony endplates of intact adult cadaveric vertebrae(L1~S1) using a 1.5mm-diameter and plane indenter with a test rate of 12mm/min,datas were analyzed statistically.
and mild moderate and sereve types of CAH corre sponded to G2,G3 and G4. The fibrosis grading were that CPH were among S1 ~ S2 and CAH were among S2~S4There were 407 cases at S1, among which both CPH and CAH were 50%.
Methods: 181 patients with chronic liver diseases examined by liver needle biopsy were divided into group S_0~S_1(76 patients) and group S_2~S4. (105 patients) according to the gradation of liver fibrosis.
Results All showed L_(4~5) or L_5~S_1 foraminal stenosis,2 cases far lateral disc protruded,8 cases the vertebral endplate posteriolateral spurs extruded into foramina,1 spondylolisthesis pseudoarthrosis pressed,4 cases had the narrow intervertebral space along with the flavum ligament hypertrophy and facet superioanterio subluxation.
The cross opening and underground decompression was designed for treatment of 42 cases with lumbar spinal stenosis by authors. There were 18 cases in L4-5,12 cases in L4-S1 and 12 cases in L5S1 among 42 patients.
In the group subjected to preoperative and postoperative urodynamic st udies, there was significant improvement in AFBV,TBC and PSV. More significant improvement was noted in all three indexes in the L 2 S 1SPR group tha n in the L 5 S 1 SPR group.
The secondary structure was finally determined by MCD as follows:a triple strand antiparallel β sheet with I20-W26, R37-A43 and V53-S59 as its β strands, a short α helix formed by W30-G35 and four turns formed by P7-K10, C14-G17, K50-V53 and D61-N64.
The failure load of the lumbosacral endplates varied significantly between the center of bone and the margin(superior endplates 65.02±6.40N~110.61±10.63N,P<0.05;inferior endplates 68.09±9.43N~162.69±16.46N,P<0.05).
At revisions the rates of positive reactions for group S0, S2, S3, S4, S6 and S12 were 100.0%, 50.0%, 38.4%, 13.3%, 12.5% and 6.2% respectively, and at sacrifices they were 33.3%, 50.0%, 23.1%, 6.7%, 6.7% and 14.3% respectively.