In vivo evaluation of calcium sulfate as a bone graft substitute for lumbar spinal fusion

BACKGROUND CONTEXT: Posterolateral fusions of the lumbar spine have nonunion rates as high as 35%. The availability of autologous bone to promote fusion is limited, particularly for multilevel fusions. Bone substitutes have been proposed to augment or replace autologous bone for spinal surgery. Calcium sulfate offers high porosity, osteoconductivity, and high resorption rate. This material has been used successfully for treatment of long bone defects but has not been investigated as a bone graft substitute for spinal fusions. PURPOSE: To determine whether the use of calcium sulfate granules in conjunction with an implantable electrical stimulator is a safe and effective means of attaining spinal fusion. STUDY DESIGN/SETTING: A rabbit lumbar fusion model was used to assess a calcium sulfate bone graft substitute in combination with electrical stimulation for spinal fusion. METHODS: Thirty-six adult New Zealand White female rabbits were divided into three groups. Each group underwent a single-level (L5-L6) fusion, receiving 3.0 cc calcium sulfate granules with bone marrow aspirate from the iliac crest. Group 1 had no electrical stimulator applied. Groups 2 and 3 received a 40-microA (Group 2) or a 100-microA (Group 3) implantable electrical stimulator. The animals were sacrificed at 8 weeks, and the rabbit spines were subjected to radiographic assessment, manual palpation, and mechanical testing. RESULTS: Two rabbits died postoperatively. The radiographic assessment revealed no fusions occurred at the adjacent nonoperated control levels (L4-L5). There were no fusions observed within Group 1, containing the calcium sulfate and bone marrow aspirate alone. The sites with the implantable stimulators showed a dose-dependent increase in fusion stiffness. However, no fusion mass in Group 2 or 3 was graded as bilaterally complete. CONCLUSION: This study found that calcium sulfate as a bone graft substitute was unsuccessful in promoting spine fusion in a rabbit model. There was radiographic evidence of rapid resorption of the calcium sulfate within 4 weeks after surgery. The use of electrical stimulation created a dose-dependent increase in mechanical competence of the bony mass. However, the addition of direct current (DC) current did not significantly alter fusion rates with calcium sulfate used as the bone graft substitute in this model.     

不同植骨材料在退变性腰椎病脊柱融合术中的应用与疗效比较

目的比较自体骨、同种异体骨、BMP复合骨应用于退变性腰椎病椎间植骨融合术中的临床疗效。方法 2005年1月-2010年1月采用脊柱植骨融合术治疗102例退变性腰椎病患者,根据植骨材料不同,将患者随机分为自体骨组(A组,35例)、同种异体骨组(B组,33例)、BMP复合骨组(C组,34例)。3组患者性别、年龄、病程、病变节段、Meyerding分级、术前椎间隙高度及日本骨科学会(JOA)评分等比较差异无统计学意义(P>0.05),具有可比性。比较不同时间点3组椎间隙高度、植骨融合率及JOA评分等情况。结果 3组患者均获随访,随访时间2～5年,平均3.2年。术后6～24个月各组椎间隙高度均较术前显著提高(P<0.05);A、C组术后6、12、18、24个月椎间隙高度显著大于B组(P<0.05),A、C组间差异无统计学意义(P>0.05)。A、C组植骨术后6个月出现融合患者,至24个月A、C组植骨融合率均为100%;B组于术后12个月出现融合患者,至24个月植骨融合率为87.88%,与A、C组比较差异有统计学意义(P<0.05)。术后12、24个月,各组JOA评分均较术前显著提高(P<0.05);A、C组JOA评分及改善优良率显著高于B组(P<0.05),A、C组间差异无统计学意义(P>0.05)。结论 BMP复合骨在退变性腰椎病手术椎间植骨中与自体骨基本等效,并优于同种异体骨,且移植骨量充足,无需有创取材,具有融合快、成功率高等特点。     

外源性重组人骨形态发生蛋白-2应用于兔腰椎植骨融合中细胞增殖的实验研究

目的 探讨外源性重组人骨形态发生蛋白-2(rhBMP-2)应用于兔腰椎后路横突植骨融合中的促成骨效应细胞增殖作用及其成骨机制. 方法 45只新西兰大白兔随机分为三组(n=15),建立腰椎后路横突间植骨融合模型,分别植入rhBMP-2/异体骨复合骨条(复合骨组)、自体髂骨条(自体骨组)、单纯异体髂骨条(异体骨组).用流式细胞仪检测2、7、14、28、35 d具有成骨效应的骨髓基质细胞(MSCs)、成骨细胞、血管内皮细胞的增殖量. 结果复合骨组MSCs增殖量在术后2、7、35 d均比自体骨组和异体骨组高,差异均有统计学意义(P<0.05).复合骨组成骨细胞增殖量除在术后2 d高于自体骨组,差异有统计学意义(P=0.028)外,在其他时间点差异均无统计学意义(P>0.05),但复合骨组成骨细胞增殖量在术后2、7、14、28、35 d时均高于异体骨组,差异有统计学意义(P<0.05).复合骨组血管内皮细胞增殖量在术后2、7、28 d均高于自体骨组和异体骨组,差异有统计学意义(P<0.05).结论 在脊柱融合的不同时间段,外源性rhBMP-2能有效地促进MSCs、成骨细胞、血管内皮细胞增殖.     

三种不同植骨方式在胸、腰椎结核手术治疗中的观察

目的:对比观察块状植骨、颗粒植骨和钛网植骨三种不同植骨方式在后路胸腰椎结核手术中的临床应用效果.方法:选取我院93例胸、腰椎结核患者,分为三组,彻底结核病灶清除后,分别采用块状植骨(32例)、颗粒植骨(35例)、钛网植骨(26例)三种不同植骨方式,对三组术中植骨所需时间,术中出血量,术后后凸畸形角纠正状况,末次随访后凸畸形角丢失状况,植骨融合时间进行对比.结果:患者均得到12～36个月随访,植骨所需手术时间A组为23.4±4.3min,B组为5.2±2.4min,C组为25.6±3.6min,B组植骨所需时间明显短于A组、C组(P＜0.05),A组、C组比较差异无统计意义(P＞0.05);术中出血量A组为553±53ml,B组为352±48ml,C组为564±47ml,B组明显少于A组、C组(P＜0.05),A组、C组比较差异无统计意义(P＞0.05);术前Cobb角A组为36.5°±5.9°,B组为36.2°±4.7°,C组为36.8°±5.1°,三组差异无统计学意义(P＞0.05),术后Cobb角A、B、C三组分别为15.3°±3.6°、15.6°±3.1°及15.1°±2.9°,三组间差异无统计学意义(P＞0.05);末次随访时Cobb角A组为16.9°±3.6°,平均丢失1.6°,B组为17.5°±3.1°,平均丢失1.9°,C组为16.8°±2.9°,平均丢失1.7°,三组差异无统计学意义(P＞0.05);植骨融合时间A组为5.9±0.4个月,B组为4.1±0.3个月,C组为6.2±0.5个月,B组明显短于A组、C组(P＜0.05),A组、C组比较差异无统计意义(P＞0.05).结论:颗粒骨植骨较传统块状植骨和钛网植骨植入方便易行,植入时间短,出血量少,植骨融合时间短,是后路胸椎结核病灶清除术后理想的植骨方式.     

A systematic review of comparative studies on bone graft alternatives for common spine fusion procedures

Background

The increased prevalence of spinal fusion surgery has created an industry focus on bone graft alternatives. While autologous bone graft remains the gold standard, the complications and morbidity from harvesting autologous bone drives the search for reliable and safe bone graft substitutes. With the recent information about the adverse events related to bone morhogenetic protein use, it is appropriate to review the literature about the numerous products that are not solely bone morphogenetic protein.

Purpose

The purpose of this literature review is to determine the recommendations for use of non-bone morphogenetic protein bone graft alternatives in the most common spine procedures based on a quantifiable grading system.

Study design

Systematic literature review.

Methods

A literature search of MEDLINE (1946–2012), CINAHL (1937–2012), and the Cochrane Central Register of Controlled Trials (1940–April 2012) was performed, and this was supplemented by a hand search. The studies were then evaluated based on the Guyatt criteria for quality of the research to determine the strength of the recommendation.

Results

In this review, more than one hundred various studies on the ability of bone graft substitutes to create solid fusions and good patient outcomes are detailed.

Conclusion

The recommendations for use of bone graft substitutes and bone graft extenders are based on the strength of the studies and given a grade.     

Engineered periosteum-bone biomimetic bone graft enhances posterolateral spine fusion in a rabbit model

BACKGROUND CONTEXT

Bone marrow derived mesenchymal stem cells (BMSCs) and periosteum-derived cells (PDCs) have shown great viability in terms of osteogenic potential and have been considered the major cellular source for skeletal tissue engineering. Using a PDCs-impregnated cell sheet to surround a BMSCs-impregnated tricalcium phosphate (TCP) scaffold might create a periosteum-bone biomimetic bone graft substitute to enhance spine fusion.

Enhanced spinal fusion using a biodegradable porous mesh container in a rat posterolateral spinal fusion model

Background contextPosterolateral fusion (PLF) with an autogenous iliac bone graft is the most common procedure for treating various lumbar spinal diseases. However, the limited success and associated morbidity from an iliac crest graft demands new biologically competent graft enhancers or substitutes.PurposeTo investigate the feasibility of tubular mesh container made of bioabsorbable sutures (poly-1,4-dioxane-2-one, PDO) for spinal fusion.Study designExperimental animal study.MethodsA biodegradable PDO tubular mesh container was used to contain small pieces of bone grafts. Twenty Sprague-Dawley male rats underwent PLF between L4 and L5 transverse processes with bilateral iliac grafts. Experimental animals were assigned into two different groups: autograft-only group (N=10) that underwent PLF with autograft-only or mesh container group (N=10) that underwent PLF with tubular mesh container filled with autogenous bone grafts. The rats were sacrificed at 8 weeks postoperatively, and the lumbar spines were removed. Spinal fusion was evaluated by manual palpation, microcomputed tomography, three-point bending test, and histological examination.ResultsSolid fusion was achieved in all cases of the mesh container group, whereas the autograft-only group showed 60% of solid fusion. New bone mass was higher and more solidly fused in the mesh container group than the autograft-only group (p<.01). Volume of fusion mass and density of bone were significantly higher in the mesh container group (p<.05). In all cases, inflammatory response was minimal.ConclusionsThis study demonstrated that a tubular mesh container made of bioabsorbable suture is useful to hold small pieces of bone grafts and to enhance spinal fusion.     

后路椎体间打压植骨融合治疗腰椎失稳的临床观察

目的:探讨后路椎体间打压植骨融合术治疗腰椎失稳症的临床疗效和适应证。方法:分析2001年1月至2008年7月95例腰椎失稳行后路椎体间打压植骨融合术的患者,其中男41例,女54例;年龄45～76岁,平均59岁。其中单节段68例,2节段22例,3节段5例,共127个椎间隙。术中椎管及患侧神经根彻底减压,由患侧切除椎间盘组织,大范围刮除软骨板直至终板,使用切除的椎板等骨质打压植骨,配合椎弓根螺钉内固定。观察手术前后的症状体征并进行JOA评分;通过腰椎X线片测量手术前后椎间高度变化并根据SUK方法观察植骨融合情况。结果:95例患者均获得随访,时间12～90个月,平均44.8个月。术后临床症状明显缓解或消失,127个椎间隙均获融合,未发生植入骨移位及严重并发症。影像学示术后椎间高度较术前显著增加。术后8周JOA评分为(25.1±2.8)分,最终随访时(24.8±3.2)分,与术前(11.3±3.3)分相比,差异有统计学意义(P0.001)。结论:后路椎体间打压植骨融合术可作为治疗腰椎失稳的有效方法之一,适用范围广,尤其适用于老年腰椎退变性不稳。     

Epidermal growth factor enhances spinal fusion: Posterolateral lumbar fusion model on rats

ObjectiveThe aim of this study was to investigate the effects of human recombinant epidermal growth factor (EGF) on posterolateral lumbar fusion in a rat model.Methods36 male Sprague Dawley rats underwent posterolateral fusion at L4-5 level. They were randomly assigned to 3 groups: 1- Sham control group where no local augmentation was made, 2- Local Hydoxyapatite β-tricalcium phosphate (HA/β-TCP) augmentation group and 3- Local HA/β-TCP + EGF augmentation group. Rats were euthanized at 8 weeks post-surgery. 6 rats from each group were selected for manual palpation examination, micro-computed tomography analysis and histologic analysis; and the rest was used for biomechanical analysis.ResultsBased on manual palpation, there was no fusion in the sham control group. Fusion rate was 33.3% in the HA/β-TCP group and 66.7% in the HA/β-TCP + EGF group (p = 0.085). Micro-CT results revealed that new bone formation was higher in the HA/β-TCP + EGF group (BV/TV: 40% vs. 65%) (p = 0.004). Histologically newly formed bone tissue was more pronounced in the EGF group and compacted and bridging bone spicules were observed. The median maximum bending moment values were 0.51 Nmm (0.42–0.59), 0.73 Nmm (0.49–0.88) and 0.91 Nmm (0.66–1.03) in the sham control, HA/β-TCP and HA/β-TCP + EGF groups, respectively (p = 0.013). The median stiffness values were 1.69 N/mm (1.12–2.18), 1.68 N/mm (1.13–2.74) and 3.10 N/mm (1.66–4.40) as in the previous order (p = 0.087).ConclusionThis study demonstrates that EGF enhances posterolateral lumbar fusion in the rat model. EGF in combination with ceramic grafts increased the fusion rates. Our findings may provide insights to further studies, investigating EGF's clinical usage as an alternative fusion enhancer.     

不同植骨融合术治疗腰椎滑脱症的疗效比较分析

目的：比较3种不同植骨融合术治疗腰椎滑脱症的疗效。方法：自2006年1月至2008年12月共收治腰椎滑脱症患者85例,男36例,女49例;年龄38～65岁,平均51.8岁。采用3种手术方法：后外侧植骨融合术32例（A组）、后路椎体间植骨融合术28例（B组）、前路椎体间植骨融合术25例（C组）。疗效评定采用Nakai评分标准,骨性融合标准采用Suk标准判断。结果：所有患者均获得随访,随访时间均不少于2年。A组：优19例,良9例,中4例;B组：优16例,良9例,中3例;C组：优14例,良8例,中3例。A、B、C组的融合率分别为68.8%（22/32）、92.9%（26/28）、92.0%（23/25）。B、C组的椎间隙高度维持及融合率均优于A组（P〈0.05）。结论：对于治疗腰椎滑脱症,前路及后路椎体间植骨融合术在椎间隙高度维持及融合率优于后外侧植骨融合术,但腰椎滑脱症病情及伴随并发症多样化,应具体根据患者滑脱类型、程度、有无椎间盘突出及神经症状等做出相应的选择。     

重组人骨形态发生蛋白-2/异体骨复合骨用于兔腰椎融合的正电子发射计算机体层摄影-CT研究

目的 通过应用正电子发射计算机体层摄影-CT(PET-CT)研究重组人骨形态发生蛋白-2(rhBMP-2)/异体骨复合骨行兔腰椎融合术后不同时间点融合骨组织再血管化程度及成骨活性的变化.方法 成年雄性新西兰大白兔45只,随机分为3组,每组15只.在每只兔的L4、L5横突间行腰椎后路植骨融合术,3组分别植入rhBMP-2/异体骨复合骨条(复合骨组)、自体髂骨条(白体骨组)及异体髂骨条(异体骨组),每组于术后2、4、6周注射18F-NaF,利用PET-CT对各组动物进行全身显像,对比各组植骨区摄取值(SUV).结果 2、4、6周时复合骨组和白体骨组植骨区对18F-NaF的SUV均优于异体骨组,差异有统计学意义(P＜0.05);复合骨组植骨区的SUV在4、6周时高于自体骨组,差异有统计学意义(P＜0.05),2周时与自体骨组差异无统计学意义(P＞0.05).同一组内不同时间点复合骨组和白体骨组均在4、6周时局部SUV高于2周时,差异有统计学意义(P＜0.05);4周与6 周之间差异无统计学意义(P＞0.05).异体骨组的SUV 3个时间点问差异均无统计学意义(P＞0.05).结论 兔腰椎后路植骨融合术中PET-CT检测显示:rhBMP-2/异体骨复合骨可促进骨形成并改善局部血液供应,可作为替代自体骨的理想材料.     

皮质骨轨迹螺钉在腰椎融合术中的初步应用

正腰椎椎弓根螺钉置入是目前腰椎融合手术中常用的固定方法。从后方结构经椎弓根直至椎体内贯穿"三柱"的螺钉可以为固定提供充足的把持力。然而,对于骨质疏松患者,由于骨密度降低,骨松质薄弱、稀疏,使得椎弓根螺钉固定的强度减弱,以致出现松动、切割、拔出等并发症,影响腰椎融合术的手术效果。为此,有学者通过改进螺纹设计、改良置钉方法以及应用骨水泥强化等方法提高骨质     

三种腰椎后路椎间融合植骨材料的临床对比研究

目的探讨3种不同植骨材料及骨质疏松因素对腰后路椎间植骨成功率的影响、、方法回顾分析使用自体髂骨块（A组）、同种异体骨（B组）、融合器＋自体松质骨（C组）3种不同植骨材料行腰椎后路椎M融合手术患者共1121例,其中骨质疏松者共180例,通过X线及CT检查,对植骨融合率、融合时间、椎间高度、内同定火败率进行随访并对数据进行统计学分析。结果B组6l例中,11例患者（18．5％）出现植骨不融合．其中断钉6例,断棒2例．该组l在植骨融合率、内固定失败率、椎间高度丢失、融合时间等方面比另2组差（P〈O．05）。A组和C组植骨融合率分别为97．6％、98．2％,2组比较在各方面差异无统计学意义（p〉0．05）。在180例骨质疏松患行中,A绀患者融合率（90．3％）高于C组（84．6％）,差异有统计学意义（P〈0．05）。结论后路腰椎椎间融合,使用同种异体骨融合率最低,内固定失败、惟间隙塌陷发生率较高;自体髂骨块与融合器＋自体骨植骨融合率高,内固定失败发生率小;埘于骨质疏松者,自体髂骨块融合情况更佳。     

路椎间打压植骨融合治疗腰椎滑脱症的临床观察

目的探讨后路椎体间打压植骨融合术治疗腰椎滑脱症的临床疗效。方法 2001年1月-2008年7月,采用后路椎体间打压植骨融合术治疗36例腰椎滑脱患者,观察术前、术后及末次随访时的滑脱角、滑脱率、椎间盘高度指数,计算术后滑脱复位率和融合率;采用日本矫形外科学会（Japanese Orthopaedic Association,JOA）评分和Oswestry功能障碍指数（Oswestry disability index,ODI）进行临床疗效评估。结果所有患者获得13～25个月随访,平均随访16.8个月。术后JOA评分和ODI均优于术前,差异有统计学意义（P〈0.05）;末次随访与术后比较,差异均无统计学意义（P〉0.05）。术后的滑脱角、滑脱率和椎间隙高度指数较术前有明显改善,差异有统计学意义（P〈0.05）;而末次随访与术后比较,差异无统计学意义（P〉0.05）。将术后与末次随访的JOA好转率和滑脱复位率分别进行比较,差异无统计学意义（P〉0.05）。所有滑脱节段全部融合,无内固定松动、断裂及神经并发症。结论后路椎体间打压植骨融合术是治疗腰椎滑脱症的有效方法之一。     

医用硫酸钙在家兔腰椎融合模型中的成骨能力

[目的]通过与自体髂骨进行比较,评价医用硫酸钙单独应用的成骨能力,并探讨其可能的成骨机理。[方法]建立家兔腰椎后外侧融合模型,以自身作为对照,双侧横突间植骨,左侧植入硫酸钙颗粒,右侧植入自体髂骨。于术后3、6、12周行X线、CT及组织学检查。[结果]术后3周,硫酸钙尚可见残留颗粒,自体骨完全降解;植骨区域内均可见到大量的破骨细胞,并有血管纤维组织长入。术后6周,硫酸钙完全降解,影像学检查两者之间没有明显的差异,表现为局部骨密度增高,新骨成形;组织学检查两侧植骨区内均为大量的透明软骨形成,自体髂骨植骨区内可见散在的骨小梁结构。术后12周,组织学及影像学上二者没有任何的差别,两侧形成的骨组织与家兔的椎体骨组织结构相同。[结论]医用硫酸钙作为骨移植替代材料,除了具有良好的骨传导性外,硫酸钙可能还具有骨诱导性,其成骨能力与自体髂骨相当,医用硫酸钙单独应用可以取得良好的融合效果。     

Effect of graft size on graft fracture rate after anterior lumbar spinal fusion in a sheep model

Study design

Sheep anterior spinal fusion model with autogenous and xenogenous bone grafts.

Objective

To investigate whether the relationship between cross-sectional area of the bone graft and area of the adjacent vertebral endplates has an effect on graft fracture rate.

Summary of background data

Anterior spondylodesis with autogenous iliac crest transplant is a frequently performed operation to stabilize spinal motion segments but to date no precise recommendations with respect to minimum graft size are available in the literature.

Methods

Anterior spondylodesis using autogenous and xenogenous grafts of constant size in combination with an angular stable plate (Macs TL^®). Autogenous iliac crest graft was inserted in eight sheep and xenogenic, commercially available bovine graft (Tutobone^®) in the additional eight animals.The surface areas of the endplates of the fused intervertebral space were calculated using CT scans and contact radiographs of the specimens obtained after 24 weeks. The graft itself was evaluated for fractures and osteolysis.

Results

A fracture occurred in tricortical, autogenous grafts if the graft cross-sectional area was less than 21% of the area of the adjacent endplates. All xenogenic grafts fractured and therefore a comparable value could not be determined.

Conclusion

The results clearly indicate that the relation between graft cross-sectional area and endplate area defines the survival or fracture of the graft in anterior spinal fusion. Although it is difficult to directly apply the results to the clinical situation it is suggested to choose a sufficiently large graft, in order to reduce the risk of autogenous graft fracture in anterior spondylodesis.     

后路病灶清除植骨融合内固定手术治疗跳跃性脊柱结核的疗效分析

【摘要】 目的：总结跳跃性脊柱结核的临床特点,探讨一期后路病灶清除植骨融合内固定手术治疗跳跃性脊柱结核的疗效。方法：回顾性分析2016年7月~2022年5月我院手术治疗的31例跳跃性脊柱结核患者的临床资料,其中患者男18例,女13例,年龄49.5±27.5岁。其中2处病灶24例,3处病灶7例。对每例患者明确责任椎,确定手术病灶、融合节段、内固定方式,以制定个体化手术方案,随访29.7±14.7个月（15～85个月）。记录患者手术时间、术中出血量,并记录术中及术后并发症情况;术前和术后1个月、3个月、1年及末次随访的红细胞沉降（ESR）和C-反应蛋白（CRP）;术前及术后1周、1个月、3个月、1年及末次随访的疼痛视觉模拟评分（VAS）;术前及术后1周、末次随访时病灶后凸Cobb角;记录术前及末次随访时美国脊髓损伤协会（ASIA）分级;末次随访时采用Bridwell骨愈合标准分级以评估术后结核活动性、症状改善、畸形矫正及骨愈合。结果：31例患者中20例（65.4%）只有1处病灶出现临床症状,23例（74.2%）以疼痛为主诉入院,15例（48.4%）在病程中只有疼痛症状,而11例（35.5%）只有1处病灶出现疼痛症状,18例（58.1%）患者初诊时至少有1处病灶漏诊。所有患者手术顺利,手术时间280.0±52.2min（165～330min）,失血量567.7±332.0mL（150～1000mL）。术后出现脑脊液漏4例,切口感染3例,经对症处理后痊愈;所有结核病灶均治愈,未出现复发。术前及术后1个月、3个月、1年、末次随访时ESR为41.5±26.3mm/h、16.3±13.4mm/h、12.5±6.3mm/h、11.4±5.2mm/h、9.2±3.1mm/h;CRP为32.8±23.2mg/L、7.3±5.6mg/L、6.2±4.1mg/L、5.1±3.7mg/L、2.8±2.3mg/L;术前及术后1周、1个月、3个月、1年、末次随访时VAS评分为6.4±2.4分、2.4±1.7分、2.3±1.3分、1.6±0.9分、0.9±0.7分、0.4±0.3分。术后各个时间点CRP、ESR、VAS评分较术前均有显著改善（P＜0.05）。术前Cobb角25.7°±4.9°,术后1周15.4°±2.1°,末次随访时17.1°±2.3°,术后均较术前有统计学差异（P＜0.05）;10例存在术前神经功能损伤患者,末次随访时1例术前A级患者恢复至C级;4例术前B级患者1例恢复至C级,3例恢复至D级;5例术前C级患者2例恢复至D级,3例恢复至E级;术后6～12个月42处植骨病灶均获得骨融合,末次随访时34处病灶Bridwell Ⅰ级愈合,8处病灶Bridwell Ⅱ级融合。结论：对跳跃性脊柱结核患者,明确责任椎及各处病灶病变特点,一期后路病灶清除植骨融合内固定手术治疗安全且高效,能得到满意的疗效。     

加压植骨联合单枚Cage的椎体间融合与后外侧融合治疗双节段腰椎椎管狭窄症临床效果的回顾性研究

目的探讨双节段腰椎椎管狭窄症后路减压手术后行椎间加压植骨联合单枚Cage置入的椎体间融合术（posterior lumbar interbody fusion,PLIF）与后外侧融合术（posterolateral fusion,PLF）的临床效果。方法回顾性随访分析53例双节段腰椎椎管狭窄症行后路椎管减压、融合手术的患者,分为2组,PLF组31例,PLIF组22例。对2组患者手术情况进行比较,手术前、后及末次随访进行日本骨科协会（Japanese Orthopaedic Association,JOA）评分及下腰痛的视觉模拟量表（visual analog scale,VAS）评分。结果 2组手术时间差异有统计学意义（P〈0.05）;出血量、输血量差异无统计学意义（P〉0.05）;JOA评分,手术前2组差异无统计学意义（P〉0.05）,术后2组差异有统计学意义（P〈0.05）;术后2组下腰背疼痛的VAS评分差异有统计学意义（P〈0.01）。结论椎弓根螺钉内固定椎间加压植骨联合单枚Cage置入椎体间融合术较后外侧融合效果肯定,手术方式安全,手术后恢复快,出现下腰疼痛病例少,融合率高。     

低强度超声对幼龄白兔脊柱植骨融合的生物力学影响

目的:评估低强度超声对脊枉植骨融合的生物力学影响.方法:40只12月龄大白兔制成腰椎双节段同侧横突间后外侧脊柱植骨模型,随机分试验组(B组)和对照组(A组).试验组用脉冲式超声刺激,6周后处死进行生物力学栽荷、强度、刚度、扭转等测试比较.结果:植骨融合6周时,试验组强度、刚度、扭矩和抗扭刚度、极限栽荷均比对照组高6%～7%(P＞0.05).结论:低强度超声可以促进幼龄白兔脊柱植骨融合强度,加速骨折愈合.     

Fusion mass bone quality after uninstrumented spinal fusion in older patients

Older people are at increased risk of non-union after spinal fusion, but little is known about the factors determining the quality of the fusion mass in this patient group. The aim of this study was to investigate fusion mass bone quality after uninstrumented spinal fusion and to evaluate if it could be improved by additional direct current (DC) electrical stimulation. A multicenter RCT compared 40 and 100 μA DC stimulation with a control group of uninstrumented posterolateral fusion in patients older than 60 years. This report comprised 80 patients who underwent DEXA scanning at the 1 year follow-up. The study population consisted of 29 men with a mean age of 72 years (range 62–85) and 51 women with a mean age of 72 years (range 61–84). All patients underwent DEXA scanning of their fusion mass. Fusion rate was assessed at the 2 year follow-up using thin slice CT scanning. DC electrical stimulation did not improve fusion mass bone quality. Smokers had lower fusion mass BMD (0.447 g/cm²) compared to non-smokers (0.517 g/cm²) (P = 0.086). Women had lower fusion mass BMD (0.460 g/cm²) compared to men (0.552 g/cm²) (P = 0.057). Using linear regression, fusion mass bone quality, measured as BMD, was significantly influenced by gender, age of the patient, bone density of the remaining part of the lumbar spine, amount of bone graft applied and smoking. Fusion rates in this cohort was 34% in the control group and 33 and 43% in the 40 and 100 μA groups, respectively (not significant). Patients classified as fused after 2 years had significant higher fusion mass BMD at 1 year (0.592 vs. 0.466 g/cm², P = 0.0001). Fusion mass bone quality in older patients depends on several factors. Special attention should be given to women with manifest or borderline osteoporosis. Furthermore, bone graft materials with inductive potential might be considered for this patient population.