CAJ | 학술논문

目的评价不同程度耻骨联合分离对骨盆后环应力分布的影响.方法 8具完整骨盆及近侧1/3股骨标本,用夹具将其固定于双足站立骨盆中立位,在CSS-44020生物力学试验机上加载至600 N.将应变片粘贴于骶髂关节两侧、骶骨前方和髂骨后侧选定的38个位点,应用WS3811型数字式应变仪依次测量完整骨盆、耻骨联合分离1 cm、2 cm和2.5 cm时选定位置的应变值.结果骨盆皮质骨在600 N范围内呈弹性变形,在耻骨联合完整以及不同程度分离时,两侧对应位点应变值无明显差异(P＞0.05).在耻骨联合完整时,骨盆弹性形变较大的位点分布在髂股弓走形上,耻骨联合分离后髂股弓后外侧位点应变值增加较大;骶股弓轴线位点应变值逐渐减小.结论完整骨盆环垂直负荷的传导途径与骶股弓走形近似,在耻骨联合分离时,骨盆后环传导的垂直负荷向后外侧再分布.
목적 평개불동정도치골연합분리대골분후배응력분포적영향.방법 8구완정골분급근측1/3고골표본,용협구장기고정우쌍족참립골분중립위,재CSS-44020생물역학시험궤상가재지600 N.장응변편점첩우저가관절량측、저골전방화가골후측선정적38개위점,응용WS3811형수자식응변의의차측량완정골분、치골연합분리1 cm、2 cm화2.5 cm시선정위치적응변치.결과 골분피질골재600 N범위내정탄성변형,재치골연합완정이급불동정도분리시,량측대응위점응변치무명현차이(P＞0.05).재치골연합완정시,골분탄성형변교대적위점분포재가고궁주형상,치골연합분리후가고궁후외측위점응변치증가교대;저고궁축선위점응변치축점감소.결론 완정골분배수직부하적전도도경여저고궁주형근사,재치골연합분리시,골분후배전도적수직부하향후외측재분포.
Objective To evaluate the effect of different degrees of pubic symphysis diastasis on the stress distribution of posterior pelvic ring. Methods Eight embalmed pelvis and articulated proximal 1/3 of the femurs were harvested for this study. The samples were positioned as both legs standing straight and loaded to 600 N on the on the CSS-44020 biomechanical machine. The strain gages were adhered to 38 sites distributed symmetrically on the two sides of sacroiliac joint, anterior sacrum and posterior ilium. The strain gages were connected to WS3811 digital strainometer to record strain changes of the intact pelvic ring and at 1,2, 2.5 cm of pubic symphysis diastasis. Results Elastic changes occurred in the cortical bone of the pelvis under 600 N load. The symmetrical sites had similar strain changes without significant difference in the intact pelvic ring and at 1,2, 2.5 cm of pubic symphysis diastasis ( P ＞0.05 ). The sites with more strain changes were distributed on the iliofemoral arch in the intact pelvis.The strain changes were increased significantly frona the posterolateral sites to the iliofemoral arch. But the strain changes on the iliofemoral arch were decreased significantly during pubic symphysis diastasis.Conclusion The conduction of vertical load runs along the sacrofemoral arch in the intact pelvic ring and redistributes posterolaterally during pubic symphysis diastasis.