| Objective To compare the stability of dislocation of the Sacroiliac Joint ifxedwith sacroiliac complex (group A), two IS screws(group B) and the APLS (group C)of sacroiliac joint dislocation.Methods Four adult male pelvic specimens without osteoporosis and osteopathywere selected. The sacroiliac complex was retained and other tissue wasremoved.First of all, test the normal pelvic group (group A) the correspondingdisplacement under different vertical and torsional load.Then the right SJ dislocationand the pubic symphysis separation were made，we immobilization the PS with RBP.the right sacroiliac joint dislocation were reduced anatomically and fixed in turn withtwo SI screws (group B) and APLS (group C). The pelvic specimens were fastenedto the biomechanical testing machine in erect position, first of all, the vertical load，ranging from0to700N，was applied on specimens at a speed of50N/s and thehomologue displacement was recorded. Then the specimens were exposed to torsionalload,ranging from0N*m to12N*m, at a speed of0.5N*m/s. The homologuedisplacement was recorded. Analysis of Variance was employed to analyze the data.Results Under vertical load，the displacement of group A was larger than that ofground B and ground C，the displacement of group B was larger than that of ground C(groupA：0.344±0.048、0.446±0.050、0.616±0.044、0.820±0.044、1.002±0.039、1.280±0.058、1.614±0.037; group B：0.220±0.041、0.357±0.037、0.528±0.039、0.721±0.057、0.872±0.049、1.045±0.025、1.339±0.054; group C：0.162±0.025、0.323士0.033、0.494士0.032、0.682士0.064、0.827士0.037、0.991土0.010、 1.261土0.078). Through the SNK-q test, The difference between group A and B； group Aand C,was statistically signiifcant. We can think that, in resistance to vertical load, groupB and C is different from that of group A. Between group B and group C，the differenceswas not statistically signiifcant, It is not considered that there is differences betweengroup B and group C. Under torsional load, the displacement of group A was smaller thanthat of ground B and ground C (group A：0.137±0.008、0.162±0.007、0.186±0.007、0.212±0.008、0.287±0.008、0.333±0.026; group B：0.199±0.008、0.229±0.014、0.283±0.007、0.355±0.024、0.524±0.055、0.701±0.034; group C：0.170±0.027、0.214±0.006、0.282±0.017、0.381±0.015、0.547±0.021、0.740±0.053). Through theSNK-q test, the difference between group A and B，group A and C，is statisticallysigniifcant. We can think that, in resistance to torsional load, group A is different fromgroup B and C. Under smaller torsional load (2N*m、4N*m、6N*m)，The ifxed effect ofgroup C is similar to group B. Under large torsional load (8N*m、10N*m、12N*m)，thedifference between group B and C is not statistically signiifcant (P>0.05).We can thinkthat, In large torsional load, there is no differences between group B and C.Conclusion In vertical load，the ifxed effect of group A is bad than that of group Band C. the fixed effect of group C is similar to group B. Under torsional load, we canmake a conclusion that in terms of resisting torsion, the stability of group A is better thanthat of group B and C. The fixed effect of group C is similar to group B. |
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