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1.
羟基磷灰石/多聚左旋乳酸椎间融合器的力学评价   总被引:2,自引:0,他引:2  
目的:评价羟基磷灰石和多聚左旋乳酸(hydroxyapatite/poly-L-lacticacid,HA/PLLA)制成的可吸收性腰椎椎间融合器(cage)的力学特性。方法:形状相同的HA/PLLAcage和Brantigan碳纤维cage及与cage外径相同的人尸体髂骨块各16枚,在材料实验机MTS上分别将3种椎体间置入体行压缩破坏(n=8)和压缩疲劳(n=8)试验,记录置入体压缩破坏时的最大压力、弹性系数以及1万次压力负荷后的高度变形率,并加以比较。结果:在瞬间破坏压力和弹性系数方面,HA/PLLAcage和碳纤维cage均显著高于髂骨块(P<0.05),但两种cage间差异无显著性(P>0.05)。1万次压力负荷后,两种cage的高度压缩率均显著小于髂骨块(P<0.05),且HA/PLLAcage的平均压缩率显著小于碳纤维cage(P<0.05)。结论:HA/PLLAcage和碳纤维cage较髂骨块具有更强的力学稳定性;与碳纤维cage相比,HA/PLLAcage不仅具有同等的瞬间抗破坏强度,而且具有更强的抗重复负荷变形的能力。  相似文献   

2.
[目的]系统评价纳米羟基磷灰石(nano-hydroxyapatite, NHP)与聚醚醚酮(polyetheretherketone, PEEK)两种不同材料融合器在脊柱融合术中应用效果。[方法]计算机检索2021年10月以前收录入中国知网、万方、维普、EMBASE、PubMed、The Cochrane library中国生物医学(CBM)数据库的文献,搜集有关NHP与PEEK融合器在脊柱融合术中效果对比的临床研究,采用Stata/SE 12.0软件对结局指标进行荟萃分析。[结果]共纳入6个研究,共包含654例患者,其中NHP组365例,PEEK组289例。荟萃分析结果显示:与PEEK组相比,NHP组在椎间隙高度(WMD=-0.02,95%CI:-0.21~0.17,P=0.843)、融合率(RR=1.002,95%CI:0.96~1.05,P=0.911)、塌陷率(RR=0.824,95%CI:0.47~1.44,P=0.494)、术后功能障碍指数(WMD=0.13,95%CI:-0.77~1.03,P=0.779)、术后视觉模拟评分(visual analogue scale,...  相似文献   

3.
可降解生物活性颈椎椎间融合器的研制与评价   总被引:4,自引:0,他引:4  
用羟基磷灰石(HAp),/左旋聚乳酸(PLLA)复合材料研制可降解颈椎椎间融合器。采用化学共沉淀法和开环聚合法制备HAp和PLLA,按35/65重量比共混,热压模铸加工成颈椎椎间融合器,测试样件的基本理化性质和力学特征,并评价初步的临床应用效果。结果HAp/PLLA复合材料的密度为l-64g/cm3,热压后粘均分子量为118.309KDa,融合器样件的平均极限压缩强度为128MPa,E模量5.47GPa。HAp/PLLA复合材料是一种化学性能稳定、机械性能良好的生物活性材料,用其制作的颈椎椎间融合器能够满足颈椎椎间支撑融合的基本要求,有希望达到临床上的推广和应用。  相似文献   

4.
目的:观察纳米羟基磷灰石/聚酰胺66复合物(n-HA/PA66)椎间融合器在山羊颈椎前路融合中的效果。方法:15只成年雌性山羊随机分成A、B、C组,每组5只,均行经前路C3/4椎间盘切除术,A组椎间置入n-HA/PA66椎间融合器植骨;B组置入钛网植骨;C组采用自体三面皮质髂骨块植骨。分别于术前、术后、术后4周、8周及12周拍X线片观察测量各组手术节段平均椎间高度(disc space height,DSH)、椎间角(intervertebral angle,IVA)及前凸角(lordosis angle,LA);12周时处死动物取颈椎标本进行生物力学测试及组织学检查。结果:术前三组DSH、IVA和LA无显著性差异。术后即刻及术后4周三组间DSH无显著性差异(P0.05);术后8周及12周,A组DSH与B、C组有显著性差异(P0.05);B组和C组差别无显著性(P0.05)。术后即刻及术后4周、8周三组间IVA无显著性差异(P0.05);术后12周,A、B组IVA与C组有显著性差异(P0.05),A组与B组无显著性差异。术后即刻及术后4周、8周三组间LA差异无显著性(P0.05);术后12周,A、B组LA与C组有显著性差异(P0.05),B组与C组无显著性差异。术后12周时,A、B组颈椎标本各向角位移与C组有显著性差异(P0.05);除后伸外A组各向稳定性优于B、C组;平均刚度均强于B、C组;ROM均小于B、C组(P0.05)。A组在植骨区和椎间融合器边缘可见大量成熟的骨小梁组织,材料交界处可见大量纤维骨痂及新生骨形成,骨组织与材料表面已发生嵌合;B组的植骨块与椎体间的新生骨小梁已改建为成熟的骨小梁,部分区域尚可见未完全矿化的类骨质;C组可见较多的纤维骨痂形成,在骨小梁表面有红色的类骨质,部分区域有成熟的骨小梁。结论:n-HA/PA66椎间融合器能有效维持椎间隙高度,促进山羊颈椎前路植骨融合。  相似文献   

5.
目的评价使用纳米羟基磷灰石/聚酰胺66(nano-hydroxyapatite/polyamide-66,n-HA/PA66)椎间融合器行椎间融合术治疗下腰椎退变性疾病的近期疗效。方法 2011年1月-10月,对20例下腰椎退变性疾病患者行经椎间孔入路n-HA/PA66椎间融合器支撑植骨融合内固定术治疗。男8例,女12例;年龄22~80岁,平均51岁。病程1~24个月,平均4个月。手术融合节段:L4、58例,L5、S19例,L4~S13例。腰椎间盘突出症术后复发3例,腰椎退变性滑脱症5例,腰椎峡部裂滑脱症9例,腰椎管狭窄症3例。手术前后行X线片及CT三维重建检查,测量患者融合节段椎间隙高度及前凸曲度以评价手术效果,观察植骨融合情况。采用Oswestry功能障碍指数(ODI)下腰痛评分及简明健康调查量表(SF-36)评分评价患者症状改善情况。结果术后患者切口均Ⅰ期愈合,腰腿疼痛、麻木等症状均有不同程度缓解,未出现脑脊液漏、神经根损伤、伤口感染等并发症。20例均获随访,随访时间6~9个月,平均7个月。未发生椎间融合器移位、塌陷等情况。术后3 d,3、6个月及末次随访时所有融合节段的椎间隙高度及前凸曲度均较术前显著改善(P<0.01);术后各时间点间比较,差异均无统计学意义(P>0.05)。椎间植骨融合时间3~9个月,平均4个月。术后3个月椎间植骨融合率为74%,术后6个月为96%。患者术后3 d及6个月时的ODI及SF-36评分均较术前显著提高(P<0.01),术后两时间点间比较,差异无统计学意义(P>0.05)。结论应用n-HA/PA66椎间融合器行椎间融合术治疗下腰椎退变性疾病安全有效;n-HA/PA66椎间融合器具有植骨融合率高、下沉率低及透射X线等优点,是一种较为理想的椎间支撑植骨材料,但远期疗效有待进一步观察。  相似文献   

6.
背景:在经椎间孔腰椎椎间融合术(TLIF)治疗下腰椎退行性疾病中,聚醚醚酮(PEEK)椎间融合器是临床首选的融合材料。其促植骨融合能力有限,且价格昂贵。一种新型聚氨基酸/纳米羟基磷灰石/硫酸钙(PAA/n-HA/CS)椎间融合器的早期临床效果良好。目的:评价PAA/n-HA/CS融合器行TLIF治疗下腰椎退行性疾病的中期疗效。方法:本研究为前瞻性随机对照试验。纳入2014年3月至9月在我科接受单节段TLIF治疗的30例下腰椎退行性疾病患者。随机分为试验组和对照组。试验组术中植入PAA/n-HA/CS融合器,对照组植入PEEK融合器。试验组1例患者术后1年失访,其余患者均获36个月随访。试验组:男10例,女9例;年龄28~70岁,平均48.6岁。其中腰椎滑脱症14例,椎间盘突出伴椎管狭窄症5例;手术节段:L4-L5 9例,L5-S1 10例。对照组:男3例,女7例;年龄36~68岁,平均48.0岁。其中腰椎滑脱症6例,椎间盘突出伴椎管狭窄症3例,腰椎间盘突出髓核摘除术后复发1例;病变节段:L4-L5 5例,L5-S1 5例。术前及术后随访均行X线及三维CT检查,测量患者融合节段椎间隙高度和前凸曲度评价手术效果,观察植骨融合情况。采用Oswestry功能障碍指数(ODI)下腰痛评分评价患者症状改善情况。结果:两组患者术后随访各时间点融合节段椎间隙高度、融合节段前凸曲度及ODI评分等均较术前显著改善(P<0.05)。术前及术后随访各时间点,两组各参数比较,差异无统计学意义(P>0.05)。术后12个月和36个月,试验组植骨融合率分别为95%、100%,对照组分别为90%、100%。两组植骨融合情况对比,差异无统计学意义(P>0.05)。结论:PAA/n-HA/CS融合器能够有效恢复并维持融合节段的生理高度及曲度,显著促进植骨融合,其应用于经后路椎间融合术治疗下腰椎退行性疾病患者的中期随访效果较为满意。  相似文献   

7.
腰椎退行性疾病(LDD)是骨科常见病和多发病,严重影响患者的生活和工作.腰椎椎间融合术是治疗LDD常用且有效的方法,腰椎椎间融合器作为腰椎椎间融合术的重要组成部分,其主要作用是恢复椎间隙高度及生理曲度,实现术后即刻稳定,减少椎弓根螺钉断裂发生,促进椎间骨性融合,并在一定程度上减少自体骨用量,从而减少由此引发的一系列并发...  相似文献   

8.
脊柱融合技术治疗各种脊柱疾病已有几十年的历史。最初的融合技术包括大量的肌肉松解、自体骨移植、以及长期的牵引床固定。自从脊柱内固定技术发展以来,脊柱融合的成功率得到了提高,缩短了患者的康复时间,并给手术治疗留有较多的选择空间。为降低后路内固定手术的失败率,目前逐步  相似文献   

9.
目前临床应用的腰椎椎间融合器的现状与进展   总被引:2,自引:0,他引:2  
腰椎间盘退行性疾病是骨科临床上常见的一种疾病,严重影响患者的工作和生活,随着时间推移,可能出现腰椎滑脱等更为严重的情况。因此对非手术治疗无效的患者通常需要手术治疗。近年来,各种类型椎间融合器广泛应用于临床。其作用是促进椎间的骨性融合,维持椎间隙稳定并保持椎间隙高度,并在一定程度上减少自体骨的用量,避免由此引发的一些并发症。目前临床上应用的腰椎椎间融合器有1O余种,并且很多新型的椎间融合器正在研制和试验中,相信不久的将来会有更多的性能更好的产品应用于临床。  相似文献   

10.
帽式颈椎椎间融合器的生物力学性能研究   总被引:5,自引:0,他引:5       下载免费PDF全文
目的:测试自行研制的帽式颈椎椎间融合器(HCIFC)的生物力学性能,探讨其用于颈椎椎间融合的可行性。方法:48个羊颈椎标本随机分为6组,A组,完整颈椎节段;B组,自体三面皮质髂骨;C组,Harms cage;D组,Syncage C;E组,Carhon cage;F组,HCIFC。除A组外均完全切除C3/4椎间盘后置入以上颈椎内置物,进行生物力学测定.计算出各组平均刚度及体积相关刚度,并行统计学比较。结果:置入HCIFC后颈椎屈曲刚度显著增大,而伸展、侧屈和轴向旋转刚度无变化;Syncage C在各方向上的刚度均最大,HCIFC与Carboncage相似;HCIFC在屈曲、伸展和侧屈刚度上小于Harms cage,而轴向旋转刚度显著大于Harms cage。与移植的三面皮质髂骨相比,所有cage在体积相关刚度上均有显著增加。Harms cage在各个方向上的体积相关刚度显著大于其它cage,其次为Syncage C、HCIFC及Carbon cage。结论:HCIFC可为颈椎椎间融合提供足够的初始生物力学稳定性.  相似文献   

11.
目的 :对作者设计的单枚融合器后斜向植入后路腰椎椎体间融合术行生物力学评价及临床观察。方法 :生物力学研究 :12个小牛脊柱运动节段分为 2组 ,每组 6个。实验组行单侧小关节突、半椎板切除术 ,经侧后方斜向植入加长BAK融合器 1枚 ;对照组行常规后路双侧小关节突、全椎板切除术 ,后前向植入双枚融合器。分别测试两组的纵向压缩、屈曲、侧方弯曲、伸展及双向扭转刚度并进行比较。临床研究 :经后路斜向植入单枚融合器行腰椎椎体间融合术共 40例 ,平均随访 18个月 ,进行临床评价。结果 :生物力学研究显示实验组的垂直压缩刚度、左侧 (融合器植入侧 )弯曲刚度、双侧扭转刚度均较双枚融合器组增大 (P <0 0 5 )。临床随访结果显示 ,患者症状缓解率为 92 % ,术后 1年融合率 88% ,主观满意率 90 % ,所有患者均无融合器的移位。结论 :经侧后方斜向植入单枚融合器的腰椎椎体间融合术 ,能满足后路椎体间融合的生物力学要求 ,有损伤小、脊柱后柱稳定性好、可同时行椎管减压等优点 ,可以较理想地取代后路双枚融合器植入的腰椎椎体间融合术  相似文献   

12.
椎间融合器植入颈椎即刻稳定性的生物力学评价   总被引:11,自引:1,他引:10  
目的 :①探讨不同直径螺纹状椎间融合器对颈椎强度、刚度和稳定性的影响。②椎间融合器植入法改进 ,最佳融合器直径的选择 ,为临床手术提供理论依据。方法 :成人新鲜颈椎标本 12具 ,实验应力分析 ,对颈椎的稳定性与不同程度切除终板、植入不同直径融合器后的生物力学关系进行系统分析和比较。结果 :①椎间融合器植入后 ,颈椎强度增加 2 2 % ,椎体应变下降 15 % ,而刚度增加 43 % ,位移减小 2 0 % ,与植入前颈椎具有非常显著性差异 (P <0 0 1) ,颈椎稳定性得到增强。②在改进植入法中 ,选用直径 11~ 12mm融合器 ,其覆盖椎体终板超过 3 0 %以上 ,接触面积达 65 %以上 ,颈椎最稳定 ,其椎体应变、融合器位移及沉降率最小。结论 :颈椎前路螺纹状椎间融合器植入是一种有效的初始稳定手段 ;改进植入法应选用直径 11~ 12mm之椎间融合器。  相似文献   

13.
Posterior lumbar interbody fusion (PLIF) using threaded cages has gained wide popularity for lumbosacral spinal disease. Our biomechanical tests showed that PLIF using a single diagonal cage with unilateral facetectomy does add a little to spinal stability and provides equal or even higher postoperative stability than PLIF using two posterior cages with bilateral facetectomy. Studies also demonstrated that cages placed using a posterior approach did not cause the same increase in spinal stiffness seen with pedicle screw instrumentation, and we concluded that cages should not be used posteriorly without other forms of fixation. On the other hand, placement of two cages using a posterior approach does have the disadvantage of risk to the bilateral nerve roots. We therefore performed a prospective study to determine whether PLIF can be accomplished by utilizing a single diagonal fusion cage with the application of supplemental transpedicular screw/rod instrumentation. Twenty-seven patients underwent a PLIF using one single fusion cage (BAK, Sulzer Spine-Tech, Minneapolis, MN, USA) inserted posterolaterally and oriented anteromedially on the symptomatic side with unilateral facetectomy and at the same level supplemental fixation with a transpedicular screw/rod system. The internal fixation systems included 12 SOCON spinal systems (Aesculap AG, Germany) and 15 TSRH spinal systems (Medtronic Sofamor Danek, USA). The inclusion criteria were grade 1 to 2 lumbar isthmic spondylolisthesis, lumbar degenerative spondylolisthesis, and recurrent lumbar disc herniations with instability. Patients had at least 1 year of low back pain and/or unilateral sciatica and a severely restricted functional ability in individuals aged 28-55 years. Patients with more than grade 2 spondylolisthesis or adjacent-level degeneration were excluded from the study. Patients were clinically assessed prior to surgery by an independent assessor; they were then reassessed at 1, 3, 6, 12, 18, and 24 months postoperatively by the same assessor and put into four categories: excellent, good, fair, and poor. Operative time, blood loss, hospital expense, and complications were also recorded. All patients achieved successful radiographic fusion at 2 years, and this was achieved at 1 year in 25 out of 27 patients. At 2 years, clinical results were excellent in 15 patients, good in 10, fair in 1, and poor in 1. Regarding complications, one patient had a postoperative motor and sensory deficit of the nerve root. Reoperation was required in one patient due to migration of pedicle screws. No implant fractures or deformities occurred in any of the patients. PLIF using diagonal insertion of a single threaded cage with supplemental transpedicular screw/rod instrumentation enables sufficient decompression and solid interbody fusion to be achieved with minimal invasion of the posterior spinal elements. It is a clinically safer, easier, and more economical means of accomplishing PLIF.  相似文献   

14.
目的 :测试并评价记忆合金椎间融合器的拔出强度。方法 :12具新鲜尸体腰椎标本 ,分为记忆合金椎间融合器组 (SMAcage)、螺纹状椎间融合器组 (Interfix)、方形融合器组 (Prospace)。每组测试 4个L3、4节段的双侧共 8枚融合器的拔出强度。结果 :SAMcage、Interfix和Prospace的最大拔出强度为 (75 0± 2 0 5 )N、 (695± 175 )N和 (2 5 8± 65 )N。SMAcage的拔出强度与Interfix相比无统计学差异 (P =0 2 4) ;但明显高于Prospace (P =0 0 17)。根据不同拔出曲线求得的拔出斜率分别为 (2 19 7± 49)N/mm (SMAcage)、 (195 6± 75 )N/mm (Interfix)、 (5 0 4± 2 4)N /mm (Prospace)。SMAcage和Interfix之间差别不显著 (P =0 5 9) ;与Prospace则有统计学差异 (P =0 0 2 5 )。结论 :SMAcage在用于测试的 3种融合器中具有最佳的抗拔出性能。  相似文献   

15.

BACKGROUND CONTEXT

Transforaminal lumbar interbody fusion (TLIF) is a widely accepted surgical procedure, but cage migration (CM) and cage retropulsion (CR) are associated with poor outcomes.

PURPOSE

This study seeks to identify risk factors associated with these serious events.

STUDY DESIGN

A prospective observational longitudinal study.

PATIENT SAMPLE

Over a 5-year period, 881 lumbar levels in 784 patients were treated using TLIF at three spinal surgery centers.

OUTCOME MEASURES

We evaluated the odds ratio of the risk factors for CM with and without subsidence and CR in multivariate analysis.

METHODS

Our study classified CM into two subgroups: CM without subsidence and CM with subsidence. Cases of spinal canal and/or foramen intrusion of the cage was defined separately as CR. Patient records, operative notes, and radiographs were analyzed for factors potentially related to CM with subsidence, CM without subsidence, and CR.

RESULTS

Of 881 lumbar levels treated with TLIFs, CM without subsidence was observed in 20 (2.3%) and CM with subsidence was observed in 36 (4.1%) patients. Among the CM cases, CR was observed in 17 (17/56, 30.4%). The risk factors of CM without subsidence were osteoporosis (OR 8.73, p < .001) and use of a unilateral single cage (OR 3.57, p < .001). Osteoporosis (OR 5.77, p < .001) and endplate injury (OR 26.87, p < .001) were found to be significant risk factors for CM with subsidence. Risk factors of CR were osteoporosis (OR 7.86, p < .001), pear-shaped disc (OR 8.28, p = .001), endplate injury (OR 18.70, p < .001), unilateral single cage use (OR 4.40, p = .03), and posterior cage position (OR 6.45, p = .04). A difference in overall fusion rates was identified, with a rate of 97.1% (801 of 825) for no CM, 55.0% (11 of 20) for CM without subsidence, 41.7% (15 of 36) for CM with subsidence, and 17.6% (3 of 17) for CR at 1.5 years postoperatively.

CONCLUSIONS

Our results suggest that osteoporosis is a significant risk factor for both CM and CR. In addition, a pear-shaped disc, posterior positioning of the cage, the presence of endplate injury and the use of a single cage were correlated with the CM with and without subsidence and CR.  相似文献   

16.

Introduction  

A finite element model of the L4-L5 human segment was employed to carry out a parametric biomechanical investigation of lumbar interbody fusion with a novel “sandwich” cage having an inner stiff core and two softer layers in the areas close to the endplates, with and without posterior fixation.  相似文献   

17.
聚合物颈椎椎间融合器具有维持颈椎生理曲度和椎间隙高度、提供初始力学稳定性、促进椎体间融合的特点,在颈椎前路减压融合术中应用广泛。该文对常用聚合物颈椎椎间融合器(包括不可降解的聚醚醚酮、聚酰胺、聚乙烯、聚丙烯酸酯椎间融合器以及可降解的聚乳酸、氨基酸共聚物椎间融合器)的研究进展进行综述。  相似文献   

18.
Subsidence of stand-alone cervical cages in anterior interbody fusion: warning   总被引:10,自引:0,他引:10  
Anterior cervical decompression and fusion with anterior plating of the cervical spine is a well-accepted treatment for cervical radiculopathy. Recently, to minimise the extent of surgery, anterior interbody fusion with cages has become more common. While there are numerous reports on the primary stabilising effects of the different cervical cages, little is known about the subsidence behaviour of such cages in vivo. We retrospectively reviewed eight patients with cervical radiculopathy operated upon with anterior discectomy and fusion with a stand-alone titanium cervical cage. During surgery, only the cartilage portion of the end plate was removed and the cages were filled with autologous cancellous bone graft from the iliac crest. To assess possible subsidence or migration, three different radiographic measurements in the sagittal plane were taken for each case, postoperatively and at the latest follow-up. Subsidence was defined as any change in at least one of our parameters of at least 3 mm. Follow-up time was 12–18 months (average 15 months). Five of the nine fused levels had radiological signs of cage subsidence. No posterior or anterior migration was observed. However, subsidence did not correlate with clinical symptoms in four of the five patients. The remaining patient with signs of subsidence, whose neck pain and neurologic symptoms had regressed in the early postoperative course, suffered recurrence of radiculopathy 6 months after the surgery. Her symptoms were explained by the subsidence of the cage and the subsequent foraminal stenosis observed on the magnetic resonance imaging (MRI) scan. At 15 months' follow-up, her cage was broken. Our preliminary results, so far limited in number, represent a serious warning to the proponents of stand-alone cervical cages  相似文献   

19.
目的 比较3种不同类型的后路腰椎椎间融合器的生物力学稳定性。方法 采用8具人尸体新鲜腰椎3、4节段标本,模拟后路双侧植入3种椎间融合器。实验分4组7个状态:①对照组(完整标本,Intact),②螺纹状融合器组(Interfix),③空心箱形融合器组(syncage),④实心箱形融合器组(Prospace),后3组再分别固定椎弓螺钉钢板。随机安排每个标本的融合器植入顺序。在脊柱三维运动试验机上测试不同状态的三维六个方向上的运动范围。结果各融合器的前屈运动范围与完整状态相比具有统计学差异(P<0.01);不同融合器之间则无明显差异(P=0.17)。在后伸运动上,各融合器组较完整状态组以及各融合器之间均无明显差异(P=0.25)。侧屈方向,各组融合器的植入均明显提高了稳定性(P<0.01),不同融合器之间未表现有明显差异(P=0.15)。不同融合器组在旋转运动时的ROM均较完整状态明显增加(P<0.01),同时Intemx组与其它2组融合器之间也有统计学差别(P<0.01),Prospace和synCagej之间则无明显差异(P=0.58)。后路崮定椎弓螺钉钢板后,腰椎各向ROM值均较单纯的融合器固定组显著降低(P<0.01)。结论 3种融合器之间在除外旋转运动的所有方向的稳定性无统计学差异:单独运用3种椎间融合器均无法在所有方向上达到与完整节段一致的生物力学稳定性,结合使用后路椎弓螺钉钢板后腰椎节段的稳定性可明显提高。  相似文献   

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