Experimental Study on Allogenic Decalcified Bone Matrix as Carrier for Bone Tissue Engineering

The biocompatibility and osteogenic activity of allogenic decalcified bone matrix (DBM) used as a carrier for bone tissue engineering were studied. Following the method described by Urist, allogenic DBM was made. In vitro, DBM and bone marrow stromal cell (BMSC) from rab-bits were co-cultured for 3-7 days and subjected to HE staining, and a series of histomorphological observations were performed under phase-contrast microscopy and scanning electron microscopy (SEM). In vivo the mixture of DBM/BMSC co-cultured for 3 days was planted into one side of muscules sacrospinalis of rabbits, and the DBM without BMSC was planted into other side as con-trol. Specimens were collected at postoperative week 1, 2 and 4, and subjected to HE staining, and observed under SEM. The results showed during culture in vitro, the BMSCs adherent to the wall of DBM grew, proliferated and had secretive activity. The in vivo experiment revealed that BMSCs and undifferentiated mesenchymal cells in the perivascular region invaded gradually and proliferated together in DBM/BMSC group, and colony-forming units of chondrocytes were found. Osteoblasts,trabecular bone and medullary cavity appeared. The inflammatory reaction around muscles almost disappeared at the second weeks. In pure DBM group, the similar changes appeared from the sur-face of the DBM to center, and the volume of total regenerate bones was less than the DBM/BMSC group at the same time. The results indicated that the mixture of DBM and BMSC had good bio-compatibility and ectopic induced osteogentic activty.     

CT影像诊断在直肠癌临床术前分期中的运用探讨

目的:研讨CT影像诊断在直肠癌临床术前分期中的运用价值.方法:纳入2018年6月～2020年6月期间于广东省怀集县人民医院肛肠外科进行诊疗的150例直肠癌患者作为研究对象.所有患者均进行CT影像诊断,直肠镜检查以及活体组织病理检查.以直肠镜检查和活体组织病理检查结果为参考,判断CT影像诊断对术前病例分期以及淋巴结阴阳性...     

全髋关节置换术后股骨假体周围骨折分型及处理

全髋关节置换术后假体周围骨折常常难以处理。本文就术后股骨假体周围骨折的分型、处理原则、内固定方法及治疗方法选择等作一综述     

兔骨髓间充质干细胞在组织工程中的应用

以干细胞工程为代表的现代组织工程学是近年迅速发展起来的一个新领域。本文就兔骨髓间充质干细胞的取材、分离培养、细胞表型、诱导分化、应用现状和存在的问题进行综述。     

肋间神经转位脊髓桥接恢复大鼠脊髓损伤的功能

目的 研究肋间神经转位脊髓桥接恢复大鼠脊髓损伤的功能.方法 50只大鼠分成3组,桥接组(脊髓半切加肋间神经转位桥接脊髓)、单纯脊髓半切组和正常组.于术后第4周和第8周进行BBB运动功能评分,体感诱发电位(SEP)和运动诱发电位(MEP)检测,然后分别部分处死动物,行组织学及免疫组织化学检查,检测轴突再生和瘢痕的情况.结果 术后4周和8周的BBB评分结果显示,桥接组的得分明显高于单纯半切组的得分,差异有统计学意义(P<0.05);诱发电位检测术后4周和8周SEP检测结果桥接组和单纯半切组比较差异无统计学意义,而MEP检测结果2组比较差异有统计学意义(P<0.05);术后8周组织学检查结果显示桥接组有部分轴突长入脊髓和瘢痕增生.结论 肋问神经转位脊髓桥接能促进脊髓损伤大鼠功能的部分恢复.     

骨肉瘤中基质金属蛋白酶-9、血管内皮生长因子表达的意义

目的探讨基质金属蛋白酶-9（MMP-9）、血管内皮生长因子（VEGF）的表达与骨肉瘤血管新生及临床复发转移的关系。方法采用免疫组织化学法检测46例骨肉瘤标本MMP-9、VEGF、CD34表达。结果MMP-9、VEGF的阳性表达率分别为76．09％、65．22％。不同VEGF表达组间MMP-9、MVD表达有显著性差异，MVD与MMP-9、VEGF表达强度呈正相关（P〈0．05）。转移组与复发组间VEGF表达有显著性差异（P〈0．05）。结论MMP-9、VEGF共同参与骨肉瘤的血管生成并协同表达。检测VEGF和MMP-9表达与MVD值可作为判断骨肿瘤预后的重要指标。     

骨肉瘤中u-PA、MMP-9表达的意义

目的　探讨骨肉瘤中尿激酶型纤溶酶原激活物(u PA)和基质金属蛋白酶9 (MMP 9)的表达与其复发、转移的关系。方法　采用免疫组织化学方法对46例骨肉瘤标本的u PA及MMP 9 表达进行检测,11 例骨软骨瘤作为对照。结果　u PA及MMP 9 在骨肉瘤中的阳性表达率分别为52.2 %和76.1%,骨肉瘤组织与骨软骨瘤组织间存在显著性升高(P<0.05);复发组与转移组的u PA表达有显著性升高(P<0.05);u PA、MMP 9的表达与骨肉瘤病理分级呈正相关,且u PA和MMP 9间表达呈正相关。结论　u PA和MMP 9共同促进骨肉瘤肿瘤细胞的生长和侵袭,有助于判断骨肉瘤预后。