纤维环穿刺法诱导兔椎间盘退变模型的组织学和影像学分析

目的探讨纤维环穿刺法诱导椎间盘退变模型的可行性和科学性。方法新西兰大白兔18只,经右侧腹膜外入路用弯血管钳夹持16G穿刺针准确刺入L3-4、L4-5、L5-6椎间盘的纤维环,深度控制在5 mm。于术前及术后4、8、12周对造模后的椎间盘及对照组的椎间盘（以L1-2、L2-3、L6-7为对照）行计算机X线摄影（computed radiography,CR）、MRI检查,并进行组织学观察。结果从手术后第4～12周,造模后的椎间盘高度指数（disc height index,DHI）呈递减趋势,MRI T2WI信号呈现持续减弱趋势（P〈0.01）;组织学观察发现4、8周造模组髓核细胞逐渐减少,12周组髓核细胞几乎被纤维软骨组织替代,纤维环排列不整齐,与髓核界限不清。结论纤维环穿刺法可以诱导兔椎间盘的缓慢退变,为临床深入研究椎间盘的退行性变提供了切实可行的动物模型。     

纤维环穿刺法与腰椎失稳法建立椎间盘退变模型

目的应用纤维环穿刺法与腰椎失稳法建立大鼠腰椎间盘退变模型,比较两种方法的异同。方法针刺组选用21G穿刺针对大鼠L3,4、L4,5、L5,6椎间盘行全层针刺;失稳组切除大鼠L3～L6棘突、棘上、棘间韧带和两侧关节突。于术后2周、4周和8周每组各取6只大鼠行腰椎影像学和组织学检查。结果针刺组大鼠2周时出现椎间隙狭窄,纤维环断裂,T2信号强度减低;4周时退变进展;8周时出现髓核皱缩、纤维化,T2呈完全低信号。失稳组4周时出现退变征象,8周时退变加重。结论两种方法均能建立大鼠腰椎间盘退变模型,针刺法较失稳法退变出现早、进展快且程度严重。     

肌间隙入路腰椎间盘退变模型的构建

目的探讨背最长肌与腹外斜肌间隙入路纤维环穿刺法构建兔腰椎间盘退变模型的可行性。方法新西兰大白兔6只,从兔子背最长肌与腹外斜肌间隙入路暴露椎体和椎间盘,L2/3为对照组,不暴露也不穿刺椎间盘;L3/4为假手术组,剪断L4右侧横突后暴露椎间盘,但不进行穿刺;L4/5、L5/6为穿刺组,剪断L5、L6右侧横突后暴露椎间盘并用18G针穿刺构建模型。分别在术前及术后4周对实验动物进行X线和磁共振(MRI)检查,4周后处死实验动物,取材后行组织学及免疫组织化学检查。结果术后4周,X线检查显示模型组L4/5、L5/6椎间盘高度明显降低、骨赘形成、终板硬化,MRI T2加权像亦见椎间盘高度下降,其椎间盘髓核信号明显减弱;大体观察见该组椎间盘髓核组织较少并组织松脆,呈淡黄色改变;组织学观察髓核脊索细胞数量减少,免疫组织化学观察到髓核Ⅱ型胶原表达比对照组和假手术组明显减少。结论本研究为椎间盘退变的研究提供了一种较为理想的、相对可靠的动物模型。     

Transplantation of gene-modified nucleus pulposus cells reverses rabbit intervertebral disc degeneration

Background  Intervertebral disc degeneration is the main cause of low back pain. The purpose of this study was to explore potential methods for reversing the degeneration of lumbar intervertebral discs by transplantation of gene-modified nucleus pulposus cells into rabbit degenerative lumbar intervertebral discs after transfecting rabbit nucleus pulposus cells with adeno-associated virus 2 (AAV2)-mediated connective tissue growth factor (CTGF) and tissue inhibitor of metalloproteinases 1 (TIMP1) genes in vitro.

Methods  Computer tomography (CT)-guided percutaneous annulus fibrosus injury was performed to build degenerative lumbar intervertebral disc models in 60 New Zealand white rabbits. rAAV2-CTGF-IRES-TIMP1-transfected rabbit nucleus pulposus cells were transplanted into degenerative lumbar intervertebral discs (transplantation group), phosphate-buffered saline (PBS) was injected into degenerative lumbar intervertebral discs (degeneration control group) and normal lumbar intervertebral discs served as a blank control group. After 6, 10 and 14 weeks, the disc height index (DHI) and signal intensity in intervertebral discs were observed by X-ray and magnetic resonance imaging (MRI) analysis. The expression of CTGF and TIMP1 in nucleus pulposus tissue was determined by Western blotting analysis, the synthesis efficiency of proteoglycan was determined by a ³⁵S-sulfate incorporation assay, and the mRNA expression of type II collagen and proteoglycan was detected by RT-PCR.

Results  MRI confirmed that degenerative intervertebral discs appeared two weeks after percutaneous puncture. Transgenic nucleus pulposus cell transplantation could retard the rapid deterioration of the DHI. MRI indicated that degenerative intervertebral discs were relieved in the transplantation group compared with the degeneration control group. The expression of collagen II mRNA and proteoglycan mRNA was significantly higher in the transplantation group and the blank control group compared with the degeneration control group (P <0.05).

Conclusions  CT-guided percutaneous puncture can successfully build rabbit degenerative intervertebral disc models. Both CTGF and TIMP1-transfected cell transplantation helps to maintain disc height, and promotes the biosynthesis of type II collagen and proteoglycan in intervertebral discs, reversing the degeneration of intervertebral discs.

     

纤维环针刺法建立兔椎间盘退变模型的实验研究

目的建立一种稳定可靠、可重复性好、成功率高,且与人类退变相似的椎间盘退变模型。方法38只普通级新西兰大白兔,雌雄不计,随机选取2只动物用于研究兔腰椎的解剖学特点,另外36只动物用随机数字表法均分为模型组和对照组。模型组手术取右侧腹膜后入路,暴露至L5/L6、L4/L5椎间盘纤维环,予16G穿刺针针刺纤维环;对照组同法暴露不进行针刺。分别于术前及术后4周对实验动物行X线和MRI检查,术后4周处死实验动物,取椎间盘标本行病理学检查。结果术后4周,X线和MRI检查显示模型组椎间盘高度明显降低、部分骨赘形成、终板硬化,T2加权像信号较术前明显降低、椎间盘颜色变黑变暗,髓核缩小或消失,纤维环变厚;而对照组椎间盘未见明显变化,T2加权像呈均匀高信号;取椎间盘标本经HE染色,电镜下见模型组髓核组织明显缩小,结构紊乱,细胞密度较小,纤维向内塌陷,纤维环板层出现明显断裂,排列不整齐,纤维环内层见少量毛细血管长入;对照组腰椎间盘病理学检查无明显退变表现;免疫组化见模型组椎间盘内TNF-a数量较对照组明显增多。结论该方法具有操作简单、可行、高效等优点,是建立椎间盘退变模型的一种可靠方法。     

椎间盘内注射碱性成纤维细胞生长因子对大鼠腰椎间盘针刺退变的预防作用

目的: 观察碱性成纤维细胞生长因子（basic fibroblast growth factor, bFGF）对SD大鼠腰椎间盘针刺退变的预防效果。方法： 24只成年SD大鼠随机分为实验组、对照组、空白组,每组8只。实验组在术中透视引导下用27G针头对L4-5,L5-6椎间盘后侧针刺后以微量注射器向椎间盘内注射bFGF 50 μL, 对照组椎间盘穿刺后注射生理盐水50 μL,空白组椎间盘不予穿刺,术后8周3组SD大鼠统一行MRI检查,观察T2加权像腰椎间盘信号强度的改变,以Pfirrmann分级法对椎间盘退变程度进行分级,取出椎间盘行病理学观察。结果： MRI结果显示,术后8周实验组及空白组髓核信号强度明显高于对照组,各组间Pfirrmann评分结果差异有统计学意义（P<0.05）,病理学检查显示实验组及空白组髓核细胞数量无明显改变,纤维排列整齐,对照组髓核细胞数量明显降低,胶原纤维排列紊乱。结论：bFGF注射对于后侧纤维环针刺术后SD大鼠椎间盘的退变有预防作用。     

纤维环穿刺法建立兔椎间盘退变模型

目的:拟建立一个有效的可重复的椎间盘退变模型.方法:取健康成年新西兰大白兔40只,体质量2.5~3.0 kg,雌雄不限,随机分为纤维环穿刺组和对照组,每组20只.经腹膜外入路暴露L4/5、L5/6两个椎间隙,采用21号针头从椎间隙侧前方刺入L4/5、L5/6椎间盘的纤维环,深度控制在5 mm.对照组仅分离暴露椎间盘,不做任何处理.术后1、2、4、6、8周每组随机选取4只兔子行MRI、HE染色及Ⅱ型胶原免疫组化观察退变椎间盘的变化.结果:MRI观察发现,纤维环穿刺组术后椎间盘T2信号强度呈持续减弱趋势,椎间隙高度也不断下降.从术后2周开始两组差异有统计学意义(P<0.05).HE染色观察发现,随着时间进展,纤维环穿刺组髓核细胞逐渐减少,8周时组髓核组织几乎完全变性,被纤维软骨组织替代.Ⅱ型胶原免疫组化染色示,纤维环穿刺组Ⅱ型胶原表达随时间呈进行性下降,从术后第2周开始两组差异有统计学意义(P<0.05).结论:纤维环穿刺法可以诱导兔椎间盘缓慢退变,为深入研究椎间盘退变机制及治疗手段提供可靠的动物模型.     

猴异体椎间盘移植--组织形态学研究

目的：探索治疗椎间盘病变的较好方法。方法选用恒河猴１２只进行腰椎间盘两两配对移植,观察术后不同时期间盘组织形态学变化。结果移植间盘高度术后１－５ｍｏ呈下降趋势,６－１２ｍｏ基本保持稳定,光镜下纤维环和软骨终板形态结构基本完好,有较度退变表现,未见炎症细胞浸润及骨坏死现象,透射电镜观察到移植组间盘髓核退变细胞较正常对照组增多,髓核基质中胶原原纤维数量较对照组增多,结论猴异体移植间盘在受体能够存活,移     

肿瘤坏死因子-α作用下椎间盘退变动物模型的建立

目的:制作家兔椎间盘退变（IVDD）的动物模型,研究肿瘤坏死因子-α（TNF-α）对髓核组织的影响。方法:取健康成年家兔30只,手术暴露L₂~L₆,L_3/4、L_4/5作为实验组,每个椎间盘髓核注射20 ng/μL TNF-α 15 μL;L_5/6作为对照组,每个椎间盘髓核注射15 μL磷酸缓冲盐溶液;L_2/3作为空白组,不做处理。于术后4周、8周、12周行腰椎X线及磁共振（MRI）检查,每次随机检查10只家兔,检查完后处死并取其髓核组织经行免疫组织化学及原位末端标记检查。结果:术后4~12周,X线见实验组椎间隙高度进行性下降,MRI可见实验组椎间隙T2加权像信号逐渐降低;免疫组织化学及TUNEL显示实验组髓核组织内Ⅰ型胶原及细胞凋亡率随之时间推移逐渐增加,Ⅱ型胶原逐渐减少。对照组和空白组差异无统计学意义（P>0.05）。结论:实验成功建立了TNF-α作用下的IVDD动物模型。TNF-α介导的椎间盘术后椎间隙高度丢失,同时TNF-α可诱导椎间盘髓核细胞退变及凋亡。微量注射器的穿刺作用对髓核细胞的退变及凋亡无明显影响。     

Ad/CMV- hTGF-β1 Treats Rabbit Intervertebral Discs Degeneration in Vivo

To investigate therapeutic efficiency of Ad/CMV- hTGF-β1 gene for rabbit intervertebral disc degeneration model. 60 Japanese white rabbits were selected to form the L5-L6 Anterior-Lateral-Anulus-Fibrosus-Incision-Induced model in order to simulate human intervertebral disc degeneration. 36 rabbits, whose corresponding intervertebral discs were injected with 20 μl (10 × 106 pfu)of Ad/CMV- hTGF-β1 gene, constituted the therapy group, 12 were injected with 20 μl (10 × 106pfu)of Ad/CMV-LacZ gene as comparison group, while 12 were only injected with equivalent capacity of saline for empty comparison group. 3 weeks after injection, examples were taken for investigation of HE staining, MRI, Western Blotting and immunobistochemical research TGF-β1.Wide distribution of TGF-β1 was detected by immunohistochemical research in the degenerated annulus fibrosus after injection. Western Blotting research showed significant increase of TGF-β1 content in intervertebral discs treated with TGF-β1 gene than comparison groups. MRI signal transformed from low to comparatively high and that intervertebral disc pathological degree improved.Ad/CMV- hTGF-β1 gene transfection is a potential method to increase TGF-β1 content and reverse intervertebral disc degeneration.     

腺病毒介导的Sox9基因对椎间盘退变动物模型的疗效

目的:探讨腺病毒介导的Sox9基因对兔腰椎间盘退变模型的疗效。方法:采用新西兰大白兔的纤维环损伤法制作腰椎间盘退变模型,24周后,用注射法将腺病毒介导的Sox9基因注射到退变的椎间盘组织观察退变椎间盘组织的变化,行磁共振扫描拍片观察椎间盘变化情况,同时,取椎间盘用精确定量RT-PCR观察Ⅱ型胶原(Col2 al)mRNA的变化。结果:核磁共振扫描拍片证实椎间盘退变有所恢复,精确定量RT-PCR法证实Sox9基因在转录水平上调了Col2 al。结论:腺病毒介导的Sox9基因对兔椎间盘退变模型有明显治疗作用。     

Intervertebral disc degeneration and bone density in degenerative lumbar scoliosis: a comparative study between patients with degenerative lumbar scoliosis and patients with lumbar stenosis

Background  Degenerative lumbar scoliosis is common in older patients. Decreased bone density and the degeneration of intervertebral discs are considered to be correlated with degenerative lumbar scoliosis. A means of quantifying the relative signal intensity for degenerative disc disease has not been previously discussed. The purpose of this study was to compare bone mineral density and intervertebral disc degeneration between degenerative lumbar scoliosis and lumbar spinal stenosis patients in a nine-year retrospective study.

Methods  From January 2001 to August 2010, 96 patients with degenerative lumbar scoliosis were retrospectively enrolled and 96 patients with lumbar spinal stenosis were selected as controls. Cobb angle, height of the apical disc and the contiguous disc superiorly and inferiorly on convex and concave sides, the height of the convex and concave side of the apical and the contiguous vertebral body superiorly and inferiorly were measured in the scoliosis group. The height of L2/L3, L3/L4, L4/L5 discs and the height of L2/L4 vertebral body was measured in the control group. The grade of intervertebral disc degeneration was evaluated using T2WI sagittal images in both groups. The bone density of lumbar vertebrae was measured with dual-energy X-ray.

Results  In scoliosis group, the intervertebral disc height on the convex side was greater than the height on the concave side (P <0.001). The vertebral body height on the convex side was greater than the height on the concave side (P=0.016). There was a significant difference between the scoliosis group and the control group (P=0.003), and between T-value and the rate of osteoporosis between the two groups (both P <0.001). Results were verified using multiple linear regression analysis.

Conclusions  Degenerative lumbar scoliosis is accompanied by height asymmetry between the intervertebral disc and vertebral body regarding the convex and concave surfaces. There is a positive correlation between the angle of scoliosis and the disc index, the degree of degeneration of the intervertebral disc, and a negative correlation between the angle of scoliosis and bone density.

     

非线性三维有限元法分析腰椎间盘退变

目的 探讨椎间盘退变对腰椎活动节段生物力学的影响.方法 采用新型的基于CT图像的CAD建模方法精确建立L4-L5运动节段的三维非线性有限元模型,并通过改变椎间盘材料特性和椎间盘高度等参数,建立正常椎间盘模型和轻、中、重度椎间盘退变模型,分别对4种有限元模型进行生物力学测试,比较4种模型之间刚度、髓核内压、后部结构力、纤维环基质最大应力的差异,并比较椎体、终板的应力分布变化.结果 各种载荷条件下,退变椎间盘模型刚度均与正常椎间盘模型不同,其中轻度退变模型刚度小于正常模型,而中度退变模型和重度退变模型刚度大于正常模型,且重度退变模型刚度大于中度退变模型;与正常模型比较,轻度退变模型的后部结构力略有增大,而中度退变和重度退变模型的后部结构力逐渐减小;随着椎间盘退变程度的增加,髓核内压逐渐减小,纤维环基质最大von Mises应力渐行性增大,各指标在5种载荷下表现一致;随着椎间盘退变的加重,椎间盘承载向纤维环分散,椎体、终板外缘出现应力集中现象.结论 椎间盘退变可导致腰椎活动节段刚度改变,轻度椎间盘退变引起腰椎刚度下降,而中、重度椎间盘退变时腰椎刚度增加;椎间盘退变时腰椎间盘承载与腰椎后部结构力呈现负相关变化;退变椎间盘的承载模式发生改变,椎间盘、椎体、终板应力分布存在向外周扩散的趋势.     

11例非典型休门氏病致腰椎间盘突出症的手术治疗

目的:运探讨非典型Scheuermann病致腰椎间盘突出症的临床特点及手术治疗方法。方法:2002年9月～2010年12月我院368例腰椎间盘突出症中合并有非典型Scheuermann病11例。男7例,女4例;年龄23～39岁,平均33.6岁。(L2/3)2个间隙,(L4/5)8个间隙,(L5S1)4个间隙。其中7名患者单纯采用后路椎板开窗髓核摘除术,4例患者采用腰椎后路椎管减压间盘切除、CAGE植入植骨融合+椎弓根钉内固定术。对手术疗效进行回顾性分析。结果:平均随访31个月,Oswestry评分从术前62.35±8.43分改善至21.46±7.98分。并获得较好的植骨融合,相邻节段无明显退变。出现并发症2例次,经对症处理后好转。结论:临床通过后路减压间盘切除,椎间植骨内固定术治疗非典型Scheuermann病致腰椎间盘突出症可获得良好临床疗效。     

单侧椎板开窗髓核摘除术对相邻节段椎间盘的生物力学影响

目的 应用非线性有限元分析研究单侧椎板开窗髓核摘除术对相邻节段不同程度退变椎间盘应力分布的影响.方法 墓于断层CT图像建立L3～L5节段三维非线性有限元模型,并依据L3～L4椎间盘不同退变程度建立轻、中和重度退变有限元模型,以及单侧椎板开窗髓核摘除术后模型.在模拟前屈、后伸、左右侧弯和左右旋转六个主要生理活动条件下,分析相邻节段椎间盘L3～L4髓核和纤维环von Mises应力极值变化.结果 行L4～L5左侧椎板开窗髓核摘除后,相邻L3～L4椎间盘为健康椎间盘时,髓核和纤维环基质内von Mises应力极值后伸最大,左侧弯时最小;轻度退变时,应力极值在左侧弯时增加最明显;中度退变时,髓核和纤维环基质von Mises应力极值减小,但仍高于健康椎间盘应力;重度退变时,髓核内von Mises应力极值均较轻中度椎间盘退变时下降,除轴向旋转运动外,甚至低于健康椎间盘时的应力值;纤维环基质内von Mises应力值较轻中度退变时下降,但仍高于健康椎间盘内纤维环应力,尤以左侧弯时明显.结论 当相邻节段椎间盘退变时,行单侧椎板开窗髓核摘除后避免同侧侧弯可以减少异常应力的产生,降低椎间盘退变加速的风险.

Abstract：

Objectives To study the stress distribution of the adjacent different grades of disc degeneration underwenting unilateral laminectomy and discectomy surgery using non-linear finite element analysis. Methods Based on the lumbar CT scans, the finite element model (FEM) of lumbar spinal segment(L3-L3) was established. According to L3-L4 intervertebral disc degeneration, different grades of disc degeneration( healthy,mild, moderate and severe) models were established and unilateral laminectomy and discectomy surgery were also established. Physiological action such as flextion , extension , lateral bending and lateral rotation was simulated and the yon Mises stress in the nucleus pulposus and annulus fibrosus matrix of L3-L4 disc was investagated. Results After unilateral laminectomy and discectomy surgery, the extremum value of yon Mises stress of nucleus pulposus and annulus fibrosus matrix was maximum during extension and minimus left bending in the healthy intervertebral disc. Compared with healthy disc, the increment of extremum value was found during left bending in the mildly degenerated disc. When the value decreased in the moderately degenerated disc, but still higher than that in the healthy disc. When the adjacent disc is severly degenerated, the extremum value of nucleus pulposus decreased, in addition to axial rotation, and even lower than that of healthy disc. The value of annulus matrix decreased and still higher than that of healthy disc , especially during left bending. Conclusions After unilateral laminectomy and discectomy surgery, avoiding lateral bending will reduce the abnormal stress in the degenerated disc and decreased the risk of accelerating disc degeneration.     

MRI矢状位T2图在腰椎分级中的量化分析

目的利用MRI矢状位T2图(矢状位多回波SE序列T2 mapp Ing),探讨椎间盘髓核和纤维环T2值改变在椎间盘退变中的意义,并以此进行椎间盘分级的可行性和有效性。方法随机选取30位健康志愿者(18男,12女;年龄21~49岁;平均年龄34.1岁),均利用常规FSE序列和多回波SE序列对L3/4、L4/5、L5/S1共90个椎间盘进行MRI矢状位扫描。通过图像后处理进行T2图成像(T2 mapp Ing)并对各椎间盘进行分级;测量椎间盘髓核和纤维环T2值,针对T2值与年龄、椎间盘级别、椎间盘位置之间的关系,进行统计学分析。结果 MRI矢状位T2图分级法中,椎间盘级别随着椎间盘位置的降低而增高,随年龄的增加而增高。髓核T2值随着年龄增大而减低,差异有统计学意义(P<0.05);各级别椎间盘髓核T2均值间差异有统计学意义(P<0.05)。结论 MRI矢状位T2图提供了一个建立在T2值上的椎间盘分级方法,通过对T2图的评估及椎间盘髓核和纤维环T2值的测量,有助于监测椎间盘早期退行性改变以及和相关因素的关系。     

复杂性腰椎管狭窄症的有限元建模与分析

目的精确建立复杂性腰椎管狭窄症(lumbar spinal stenosis,LSS)的退变腰椎全节段有限元模型,与正常模型进行对比。方法选取复杂性LSS患者采集CT数据,采用专用生物力学软件建立退变腰椎全节段模型,同时构建正常材质和几何形态的腰椎模型,用相同边界条件进行对比分析。结果复杂性LSS腰椎的刚度增加、活动度范围比正常模型要小,特别是后伸工况减少了25.4%。总体上,退变腰椎的应力有增大趋势,退变节段椎间盘L4～L5和邻近上位椎间盘L3～L4的终板、髓核和和维环基质应力分布趋向四周边缘集中,特别是基质应力最大增加129%。结论复杂性腰椎管狭窄症的腰椎有限元模型的活动度减少、刚度增加,退变椎间盘四周出现应力集中,促进邻近椎间盘退变。     

Ad/CMV- hTGF-beta1 treats rabbit intervertebral discs degeneration in vivo.

To investigate therapeutic efficiency of Ad/CMV- hTGF-beta1 gene for rabbit intervertebral disc degeneration model. 60 Japanese white rabbits were selected to form the 1.5-L6 Anterior-Lateral-Anulus-Fibrosus-Incision-Induced model in order to simulate human intervertebral disc degeneration. 36 rabbits, whose corresponding intervertebral discs were injected with 20 microl (10 x 10(6) pfu) of Ad/CMV- hTGF-beta1 gene, constituted the therapy group, 12 were injected with 20 microl (10 x 10(6) pfu)of Ad/CMV-LacZ gene as comparison group, while 12 were only injected with equivalent capacity of saline for empty comparison group, 3 weeks after injection, examples were taken for investigation of HE staining, MRI, Western Blotting and immunohistochemical research TGF-beta1. Wide distribution of TGF-beta1 was detected by immunohistochemical research in the degenerated annulus fibrosus after injection. Western Blotting research showed significant increase of TGF-beta1 content in intervertebral discs treated with TGF-beta1 gene than comparison groups. MRI signal transformed from low to comparatively high and that intervertebral disc pathological degree improved. Ad/CMV- hTGF-beta1 gene transfection is a potential method to increase TGF-beta1 content and reverse intervertebral disc degeneration.     

正常与退变髓核细胞II型胶原蛋白和番红染色的研究

目的对正常与退变椎间盘髓核细胞（Nucleus pulposus of intervertebraldiSC）II型胶原蛋白免疫荧光染色及番红“O”染色进行比较。方法对正常与退变椎间盘髓核细胞进行番红“O”染色及细胞内II型胶原蛋白行免疫荧光染色。结果（1）免疫荧光染色：退变椎间盘髓核细胞轻度染色,呈类圆形,染色模糊,细胞内仅有极少量荧光颗粒;（2）番红“O”染色：退变盘髓核细胞形态不规则,细胞核染色较淡,形态不规则,细胞突起及胞浆染色不均匀,部分细胞组织结构分解,完整性消失,细胞稀疏,排列混乱,有的可见少量细胞坏死区。结论正常与退变椎间盘髓核细胞比较,在退变的椎间盘中髓核细胞数量减少、部分凋亡,髓核细胞内的Ⅱ型胶原蛋白含量明显减少。     

骨髓间充质干细胞修复兔椎间盘实验性研究

目的探讨骨髓间充质干细胞修复兔椎间盘损伤的效果。方法选取30只健康新西兰大白兔,随机分为观察组(n=15)和对照组(n=15)。2组兔均行椎间盘纤维环退行性变模型的建立。建模后观察组兔给予骨髓间充质干细胞与地塞米松磷酸钠的混合溶液进行治疗,对照组兔给予地塞米松磷酸钠进行治疗。对2组治疗后的椎间盘高度指数(DHI)、Ⅱ型胶原量及病理学情况进行比较。结果观察组兔在治疗后2、4、8、12周时的DHI和髓核组织的Ⅱ型胶原量与对照组比较差异均有统计学意义(P<0.05)。观察组兔病理分级优于对照组,差异有统计学意义(P<0.05)。结论骨髓间充质干细胞在体外经过培养能够有效地对椎间盘纤维环进行修复。