摘要
目的:比较新型点式接触动力加压接骨板和动力加压钢板的力学性能和固定后皮质骨微循环形态学的变化。方法:实验于2002-01/05在第三军医大学西南医院骨科实验室完成。①力学测试:采用山羊新鲜配对胫骨20对,做成横断骨折模型,分别用动力加压钢板及点式接触动力加压接骨板加压固定和骨折断端存在3mm间隙情况下固定,进行四点弯曲实验及扭转实验比较两者的力学性能。②骨血液循环改变:采用13只山羊,在左右侧完整胫骨中段分别用点式接触动力加压接骨板和动力加压钢板固定。分别于固定术后1d,2,6,12周进行活体双硫蓝染色,固定骨段钢板床和横切面观察。结果:13只山羊均进入结果分析。①两种接骨板四点弯曲试验结果:两种接骨板抗弯、抗扭性能差异均无显著性。②两种接骨板动物实验结果:动力加压钢板固定侧术后1d,2周,6周板下皮质骨外层持续存在缺血现象,直到术后12周微循环恢复;点式接触动力加压接骨板实验侧于术后1d螺钉孔周围和钢板点接触部位皮质骨缺血,两螺钉孔中间骨段未观察到明显缺血区域,于术后2周已完全恢复。结论:点式接触动力加压接骨板和动力加压钢板的力学性能相似,但点式接触动力加压接骨板可明显保护局部骨微循环。
AIM： To compare the mechanical performance of point contact-dynamic compression plates （PC-DCP） and dynamic compression plates （DCP） and bone microcirculation changes after the two plates application in a goat tibia model. METHODS： The experiment was carried out in the orthopaedic laboratory of Southwest Hospital of the Third Military Medical University of Chinese PLA between January and May 2002. ① Mechanical test： Four-point bending and torsion tests were conducted with the plates fixed to 20 paired fresh cadaveric goat tibiae in which mid-shaft transverse osteotomies were created with 3 mm interspace. ② Changes of bone blood circulation： Thirteen goats were used in the experiment. After bilateral intact tibias of goats were fixed with DCP and PC-DCP respectively, regions of perfusion deficiency were observed at 1 day and 2, 6 and 12 weeks after operation by means of disulphine blue staining technique. RESULTS： All the 13 goats were involved in the analysis of results. ① Results of the four-point bending and torsion tests： There were no significant differences in the anti-bending and anti-torsion between DCP and PC-DCP. ② Results of animal experiment： DCP application resulted in a continuous perfusion deficiency under the plate at 1 day and 2 and 6 week after operation. Regions of perfusion deficiency limited to the surrounding of the drill hole site and the points where the plate contacted with the bone following PC-DCP application at 1 day and disappeared at 2 weeks; CONCLUSION： PC-DCP has excellent biomechanical characters as DCP. PC-DCP can obviously protect local bone microcirculation.
出处
《中国临床康复》
CSCD
北大核心
2006年第5期107-109,113,i0005,共5页
Chinese Journal of Clinical Rehabilitation
