The Measurement Of Femoral Anteverion And Neck-shaft Angle In Rats And The Femoral Neck Of Rats' Biomechancal Test

PartⅠThe measurement of femoral anteversion and neck-shaft angle in ratsObjective Through measuring the neck-shaft angle and the femoral anteversion angle, get the range of normal value of the neck-shaft angle and the feromal anteversion angle,therefore,to set the foundation for the study of proximal femoral mechanics research in the future.Methods Scanning the femoral specimens of 50 pair of Wistar rats with scanner and input the pictures into computers to measure them,work out the neck-shaft angle and the femoral anteversion angel,which will be analysed in statistics ways to gain the normal valueResults The scanning method obtains the neck-shaft angle is 123.29°±3.85°,the femoral anteversion angle is 24.86°±4.44°.The neck-shaft angel and the feromal anteversion angel of rat carry on Independent-Samples T Test,the former difference has statistics significance,left side is bigger than right side,The latter difference non-statistics significance.The neck-shaft angle and the feromal anteversion angle comparison between the female and male rat,have statistics significance.The female feromal anteversion angle is bigger than the male,but the male the neck-shaft angle is bigger than female.Conclusion The scanning method does not need any expense nearly,may be many times redundant,and result stable reliable,moreover it may simultaneously demonstrate that two-sided and the multi-lateral of the neck-shaft angle and the feromal anteversion angle,is advantageous in carries on two-sided or the multi-lateral contrasts.Scanning is a accurate and reliable method that is improvement of anatomise measurement to measure femoral anteversion and neck-shaft angle,may provide the reference value for femoral biomechanical experiment. PartⅡThe femoral neck of rats' biomechanical testObjective Through changes the neck-shaft angle and femoral anteversion angle of rat, obtains the femoral neck failure force under the different rat neck-shaft angle and feromal anteversion angle,thus obtains the data to carry on statistics to analyze the conclusion to instruct the clinical treatment femoral neck disease.Methods First gains 80 normal growth male Wistar rats femur specimen,random average divides into 8 groups:The normal control group,the experimental group of neck-shaft angle reduces 3°,the experimental group of neck-shaft angle increases 3°, the experimental group of neck-shaft angle increases 6°,the experimental group of neck-shaft angle increases 9°,the experimental group of feromal anteversion angle increases 3°,the experimental group of feromal anteversion angle reduces 3°,the experimental group of feromal anteversion angle reduce 6°,Then fixes the embedding rat femur specimen in EnduraTEC ELF3200 biomechanical testing apparatus and carries on mechanics test obtains the data.SPSS15.0 statistical package was used for a homogeneity of variance test and a single way analysis of variance(ANOVA) with a Scheffe test.The level of statistical significance was set to 0.05.Results The control group compares with each experimental groups has the significance difference(P<0.05 ),control group's failure force is bigger than each experimental groups,and is bigger along with the angle change.Conclusion Biomechanics of the femoral neck tested in rat experiments show that under the anatomy position the femoral neck have the best mechanical properties:the largest failure force,the lowest femoral neck stress,If neck-shaft angel and the feromal anteversion angel increased or reduced,mechanical properties became lower,the failure force became smaller,the stress increased,and the greater the deviation from the original point of view,smaller maximum load and stress increase the more obvious.