摘要
背景:许多实验结果显示组织工程骨植入体内后,其血管化进程和有效程度对骨成骨愈合的优劣起到关键性作用。目的:建立组织工程骨修复猕猴胫骨段性缺损的血管化动物模型,观察其影像学和形态学特点,分析血管化程度和成骨的关系。设计:随机对照动物实验。单位:南方医科大学南方医院创伤骨科。材料:支架主要成分为β-磷酸三钙,圆柱状,20mm×8mm(直径),侧方开纵槽2mm宽,内有轴向全长中空管直径3mm,中空管向两端及纵槽开放。孔隙率60%,孔径100～150μm。四五岁健康猕猴29只,体质量在3.5～5kg,雌雄不限。方法:实验于2003-10/2005-07在南方医科大学南方医院创伤骨科完成。①将27只猕猴右侧胫骨(共27处)制成中段20mm骨-骨膜缺损,采用随机数字表法随机分成3组。②筋膜-血管组在缺损处填塞由骨髓基质干细胞和具有特殊外型(侧槽和中空管)的β-磷酸三钙支架体外构建的复合物,在中空管内移入隐动静脉束的一段,外被带蒂深筋膜;筋膜组、空白组分别填塞组织工程骨并包裹筋膜和单纯组织工程骨。另取2只猕猴的无填充物胫骨缺损作缺损对照。钢板螺钉固定。③在术后4,8,12周时间点分别对各组骨-骨膜缺损行放射影像学评分和X射线阻射密度分析,以及血管面积图像分析。主要观察指标:骨-骨膜缺损放射影像学评分、X射线阻射密度分析、形态学检测以及血管面积图像分析。结果:29只猕猴均进入结果分析。①猕猴标本大体观察:术后12周:筋膜-血管组植入物各面及中央部完全被骨样组织所包裹或替代,坚硬,折不断,材料2/3被吸收;筋膜组和空白组植入物于内侧及前面仍有部分材料未被骨样组织所包裹或替代,用力可以折断,材料1/3被吸收。②各组支架材料组织学观察:随着时间的延长,3组支架材料均有不同程度的吸收,筋膜-血管组最明显;镜下观察,12周时移植物完全被骨�
BACKGROUND： Many experiments indicate that the angiogenesis of tissue engineered bone graft plays a key role in the osteogenesis.
OBJECTIVE： An experimental pattern was set up designed to prepare a kind of vascularized engineered-bene graft for repairing rhesus tibia defects and analyze the relation of angiogenesis and osteogenesis in vivo by rontgenographic and morphological approaches.
DESIGN： Random controlled animal experiment.
SETTING： Department of Orthopaedics and Traumatology, Nanfang Hospital, Southern Medical University.
MATERIALS： The composite graft was constructed by seeding the induced bone marrow stem cells （BMSCs） on to a beta-tricalcium phosphate （β-TCP） scaffold in vitro, a circular cylinder （20 mm × 8 mm diameter） with a slit （width 2 mm and length 3 mm ） open to both ends and slot. Porosity 60% and pore diameter 100-150 μm. Twenty-nine healthy rhesuses aged 4-5 years and weighted 3.5-5 kg were adopted without gender limitation.
METHODS： The experiment was conducted in the Department of Orthopaedics and Traumatology, Nanfan Hospital, Southern Medical University from October 2003 to July 2005. ①Bone-periosteum defect of 20 mm was made in the middle part of right tibia of the 27 rhesuses, and randomly divided into 3 groups equally. ②The defect gaps in fascia-blood vessel group （A） were plugged with in vitro engineered composites constructed by bone marrow stem cells and β-TCP scaffold, which were totally hugged by a sheet of pedicled deep fascia and additionally a corresponding portion of saphenous artery and veins. The gaps in fascia group （B） and control group （C）, however, were inserted with fascia-coated tissue engineered bone and tissue engineered bone only, respectively. Furthermore, two rhesuses without filling materials on the defect were picked up as blanks fixed by steel pins. ③The angiogenesis and osteogenesis for each treatment was assessed by radioactive imaging, roentgenographic analyses, blocking density and vaso-area imag
出处
《中国临床康复》
CSCD
北大核心
2006年第33期174-178,F0003,共6页
Chinese Journal of Clinical Rehabilitation
基金
国家高科技研究发展计划重点项目(2003AA205010)
国家自然科学基金(30300367)
广州市科委科技攻关重点项目(200221-0038)~~
