复合rhBMP_2的异种骨(rhBMP_2/BCB)与骨膜联合移植修复兔桡骨节段性骨缺损

目的　探讨复合基因重组人ＢＭＰ２ 的异种骨（ｒｈＢＭＰ２／ＢＣＢ） 移植及其与骨膜联合移植修复节段性骨缺损的效果。方法　将ｒｈＢＭＰ２ 与去抗原牛松质骨载体（ＢＣＢ）复合,制成ｒｈＢＭＰ２／ＢＣＢ;并采用兔桡骨干１．５ ｃｍ 缺损的动物模型,通过Ｘ线、生物力学、骨密度、组织学等检测手段,比较单纯ｒｈＢＭＰ２／ＢＣＢ移植、ｒｈＢＭＰ２／ＢＣＢ 与带血运骨膜联合移植及ｒｈＢＭＰ２／ＢＣＢ 与游离骨膜联合移植修复节段性骨缺损的疗效。结果　（１） 单纯ｒｈＢＭＰ２／ＢＣＢ 移植,可在１６ 周使节段性骨缺损基本修复,其修复机制与过程和重组异种骨相似;（２）ｒｈＢＭＰ２／ＢＣＢ与带血运骨膜联合移植,８ 周即可修复骨缺损,其修复机制与骨折修复相仿,包括膜内成骨和软骨成骨两种机制;（３）ｒｈＢＭＰ２／ＢＣＢ与游离骨膜联合移植,在骨缺损修复早期（ ≤１２ 周） ,其成骨速度及成骨质与量均优于单纯ｒｈＢＭＰ２／ＢＣＢ移植,约在１２ 周使骨缺损基本修复。结论　上述三种方法均可有效地修复节段性骨缺损,但以ｒｈＢＭＰ２／ＢＣＢ与带血运骨膜联合移植较为理想。该方法同时具有良好的骨生成、骨传导和骨诱导作用。     

珊瑚复合人工骨骨诱导活性的实验研究

目的弥补单纯珊瑚无骨诱导活性、骨修复能力弱等缺陷,为临床提供理想的骨移植替代材料。方法将珊瑚与胶原和重组人骨形成蛋白２（ｒｈＢＭＰ２）复合,制备珊瑚／胶原／ｒｈＢＭＰ２复合人工骨,将其植入大鼠背部肌肉陷窝,以珊瑚／胶原和珊瑚／ｒｈＢＭＰ２复合人工骨植入作对照;取材后通过组织学方法和图像分析评价其骨诱导活性。结果珊瑚／胶原／ｒｈＢＭＰ２植入后１周,在局部诱导出软骨细胞分化和软骨基质形成;植入后４周,形成含骨髓的板层骨;诱导成骨的量有明显的ｒｈＢＭＰ２剂量依赖性（Ｐ＜０．０１）;而珊瑚／胶原和珊瑚／ｒｈＢＭＰ２植入区均无骨或软骨形成。结论珊瑚／胶原／ｒｈＢＭＰ２复合人工骨具有良好的异位诱导成骨活性,是一种较理想的骨移植替代材料。     

复合rhBMP2的异种骨（rhBMP2／BCB）与骨膜联合移植修复兔桡骨 …

目的 探讨复合基因重组人ＢＭＰ２的异种骨（ｒｈＢＭＰ２／ＢＣＢ）移植及其与骨膜联合移植修复节段性骨缺损的效果。方法 将ｒｈＢＭＰ２与去抗原牛松质骨载体（ＢＣＢ）复合,制成ｒｈＢＭＰ２／ＢＣＢ;并采用桡骨干１．５ｃｍ缺损的动物模型,通过Ｘ线、生物力学、骨密度、组织学等检测手段,比较单纯ｒｈＢＭＰ２／ＢＣＢ移植、ｒｈＢＭＰ２／ＢＣＢ与带血运骨膜联合移植及ｒｈＢＭＰ２／ＢＣＢ与游离骨膜联合移植修复节段性     

脊髓损伤大鼠胫骨骨痂中降钙素基因相关肽的改变

目的 研究脊髓损伤后大鼠胫骨骨痂中降钙素基因相关肽（ＣＧＲＰ）的变化及骨痂量的改变。方法 将１００只雌性Ｗｉｓｔａｒ大鼠随机分为２组,Ｔ１０－１１脊髓横断＋右胫骨骨折组和单纯右胫骨骨折组各５０只。术后３、７、１４、２１、２８ｄ分批处死,检查血清碱性磷酸酶（ＡＬＰ）,摄右胫骨Ｘ线片行骨痂评分,骨痂行苏木精－伊红（ＨＥ）染色和ＣＧＲＰ免疫组织化学染色。结果 脊髓缶伤组３、７ｄ,ＡＬＰ均显著升高（Ｐ〈０     

卵巢切除对鼠及异常应力鼠骨密度影响的比较研究

目的：探讨卵巢切除雌激素缺乏时鼠及异常应力鼠不同部位骨密度的变化规律。材料与方法：３个月龄ＳＤ雌性大鼠６４只，双侧卵巢切除（ＯＶＸ）及行假手术（Ｓｈａｍ－Ｏ）；于术后第１、３、５、７个月各处死８只动物，切取Ｌ１～Ｌ２椎体节段、股骨及胫骨，进行ＢＭＤ（骨矿密度）检测；新生２４～７２小时雌性ＳＤ鼠４８只，建立双后肢大鼠模型，椎体、股骨及胫骨均承受较高的应力。３月龄时再同法分组，术后第２、５、７个月时分别处死动物取上述部位进行ＢＭＤ检测。结果：ＯＶＸ后第１个月椎体ＢＭＤ明显骨丢失（Ｐ＜０．０１），股骨丢失较为缓慢，７个月时方呈现差异（Ｐ＜０．０５）。松质骨区丢失时间提前（Ｐ＜０．０５）。胫骨１个月ＢＭＤ即有差异性（Ｐ＜０．０５），松质骨区则呈持续丢失。结论：鼠ＯＶＸ后ＢＭＤ的丢失速度为腰椎＞胫骨＞股骨；腰椎体＞胫骨上段＞股骨上段。双后肢大鼠组亦呈现同样变化，但腰椎、股骨及胫骨上的应力增加，ＢＭＤ的丢失较缓慢。     

利用可生物降解共聚膜引导骨再生

目的　采用生物降解可吸收材料聚己内酯（ Ｐ Ｃ Ｌ）和聚乳酸（ Ｐ Ｌ Ａ）共聚膜修复长骨节段性骨缺损,探讨其引导性骨再生的效果及机制。方法　采用兔桡骨中段１２ ｃｍ 节段性骨缺损（保留骨膜）动物模型２４ 只,平均分成两组,实验组用膜包绕骨缺损区,对照组缺损区不处置,分别于术后３、６ 及１２ 周处死动物,进行 Ｘ 线片、大体及组织学观察。结果　实验组缺损区骨生长明显优于对照组,术后 ３ 周实验组可见明显的骨痂沿膜外生长;术后 ６ 周以桥接的外骨痂形成骨性连接;术后１２ 周膜内外均形成骨性连接,对照组从术后６ 周开始表现为骨不连。结论　利用可生物降解的膜性材料可引导骨组织再生,通过膜外骨痂以及形成相对迟缓的膜内骨痂共同完成骨缺损的修复;膜性材料通过屏障作用一方面有效地阻挡纤维组织长入缺损区,防止骨不连形成,另一方面在局部形成营养物质浓聚,并通过表面的微孔为骨细胞生长充当支架,促进骨缺损愈合。     

高能震波对骨痂中骨形成蛋白表达的影响

目的 观察高能震波（ＨＥＳＷ）对骨痂中骨形成蛋白（ＢＭＰ）表达的影响，探讨其促进骨折愈合的机理。方法 手术造成家兔双侧胫骨中段标准骨折模型，对一侧胫骨骨折部施以ＨＥＳＷ，另一侧为对照组，术后每周进行Ｘ线及组织学检查，并取骨痂组织切片用ＢＭＰ抗体进行免疫组化染色（ＳＡＢＣ法（）。结果 实验组骨痂中ＢＭＰ表达强度在第２－４周时明在于对照组（Ｐ〈０．０１），且Ｘ线摄片及组织学观察均显示实验组骨折愈合时间     

碱性成纤维细胞生长因子增强人重组骨形态发生蛋白-2诱导成骨的调节机理

目的：对ｂＦＧＦ增强ｒｈＢＭＰ－２诱导成骨的调节机理进行探讨。方法：２１０只ＢＡＬＢ／ｃ小鼠随机分为３组,每组７０只,试验侧均位于右后肢。设立ｒｈＢＭＰ－２／牛松质骨载体、单纯牛松质骨载体为对照组,分别于术后１２ｈ～２１ｄ共１１个时间点取材,观察其诱导成骨过程。结果：ｒｈＢＭＰ－２／ｂＦＧＦ／聚乙烯吡咯啉酮／牛松质骨载体组在诱导间充质细胞增殖、分化,软骨细胞、新生骨形成方面均早于ｒｈＢＭＰ－２／牛松质骨载体组,成骨量优于ｒｈＢＭＰ－２／牛松质骨载体组,而单纯牛松质骨载体组在２１ｄ仅出现了少量增殖的间充质细胞。结论：ｒｈＢＭＰ－２和ｂＦＧＦ在诱导成骨调节中存在着协同作用。     

引导性骨再生中内源性BMP的作用

为探讨引导性骨再生中，内源性ＢＭＰ对骨再生过程的作用而进行以下研究。手术的方法造成兔桡骨中段１０ｍｍ缺损。实验侧用硅胶膜管连结骨缺损，作为引导性骨再生模型。另一侧作为对照。１５只新西兰兔分为三组，分别于术后３，７及１４日处死，标本行组织学及ＢＭＰ免疫组化检查。切片上，距骨端１，２，５ｍｍ处设置ａ，ｂ，ｃ线。利用真彩色计算机图像分析系统在三条线上选点测量ＢＭＰ值。实验侧骨缺损区内有一个完整的血肿结构，其ＢＭＰ染色阳性，膜管外组织ＢＭＰ染色几乎完全阴性。对照侧ＢＭＰ弥散于骨缺损周围的肌肉组织中。１周时，实验侧及对照侧均可见新骨形成。２周时，对照侧已停止，实验侧仍可见持续骨再生。ＢＭＰ定量分析中，实验侧三条带的ＢＭＰ值大部分高于对照侧。实验侧和对照侧ｂ，ｃ带之间存在梯度差，但实验侧的差值小于对照侧。这不仅证明了Ｈｕｌｔｈ关于骨折间隙存在ＢＭＰ浓度梯度的假说，也显示膜在引导性骨再生中可将内源性ＢＭＰ局限于骨缺损区内，提高内源性ＢＭＰ浓度并改善其分布的作用。这有利于骨再生，可能是引导性骨再生机理之一。对照侧ＢＭＰ值１周时最高，而实验侧在２周时仍呈持续升高。这说明，内源性ＢＭＰ有两个来源：骨端吸收释放及骨形成细胞合成。     

游离骨膜与复合rhBMP2的异种骨联合移植修复骨缺损的实验研究

目的 探讨复合基因重组人ＢＭＰ２（ｒｈＢＭＰ２）的异种骨与游离骨膜（ＦＰ）联合移植修复节段性骨缺损的效果。方法 将ｒｈＢＭＰ２与去抗原牛松质骨载体（ＢＣＢ）复合,制成ｒｈＢＭＰ２／ＢＣＢ;选用新西兰大耳白兔２８只,制成烧骨干１５ｍｍ缺损动物模型,分别行ＦＰ和ｒｈＢＭＰ２／ＢＣＢ复合移植（ｎ＝６）、ｒｈＢＭ２／ＢＣＢ移植（ｎ＝６）和单纯ＢＣＢ移植（ｎ＝２）;术后４、８、１２、１６周取材,通过Ｘ线、生     

A bioactive synthetic membrane improves bone healing in a preclinical nonunion model

ObjectivesHigh energy long bone fractures with critical bone loss are at risk for nonunion without strategic intervention. We hypothesize that a synthetic membrane implanted at a single stage improves bone healing in a preclinical nonunion model.MethodsUsing standard laboratory techniques, microspheres encapsulating bone morphogenic protein-2 (BMP2) or platelet derived growth factor (PDGF) were designed and coupled to a type 1 collagen sheet. Critical femoral defects were created in rats and stabilized by locked retrograde intramedullary nailing. The negative control group had an empty defect. The induced membrane group (positive control) had a polymethylmethacrylate spacer inserted into the defect for four weeks and replaced with a bare polycaprolactone/beta-tricalcium phosphate (PCL/β-TCP) scaffold at a second stage. For the experimental groups, a bioactive synthetic membrane embedded with BMP2, PDGF or both enveloped a PCL/β-TCP scaffold was implanted in a single stage. Serial radiographs were taken at 1, 4, 8, and 12 weeks postoperatively from the definitive procedure and evaluated by two blinded observers using a previously described scoring system to judge union as primary outcome.ResultsAll experimental groups demonstrated better union than the negative control (p = 0.01). The groups with BMP2 incorporated into the membrane demonstrated higher average union scores than the other groups (p = 0.01). The induced membrane group performed similarly to the PDGF group. Complete union was only demonstrated in groups with BMP2-eluting membranes.ConclusionsA synthetic membrane comprised of type 1 collagen embedded with controlled release BMP2 improved union of critical bone defects in a preclinical nonunion model.     

新型生物活性陶瓷复合人工骨成骨效应的实验研究

目的　探讨新型生物活性陶瓷复合材料成骨效应 ,为人工骨替代材料临床应用提供依据。　方法　小鼠 96只 ,随机分为 4组 ,每组 2 4只。采用具有诱导活性的骨形成蛋白 (bone morphogenetic protein,BMP)分别与羟基磷灰石 (hydroxyapatite,HA)、磷酸三钙 (tricalcium phosphate,TCP)、胶原复合羟基磷灰石 (collagen HA,CHA)及氟化羟基磷灰石 (fluoridated HA,FHA)复合 ,将 4种复合材料 (HA/ BMP,TCP/ BMP,CHA/ BMP及 FHA/ BMP)分别植入 4组小鼠左侧股部肌肉内为实验侧 ,右侧分别植入 HA、TCP、CHA及脱钙牙基质 (decalcified dentin matrix,DDM)作为对照 ,在 1、3、5及 7周取材作大体观察、组织形态学、扫描电镜观察及生化测定。　结果　各组实验侧及第 4组对照侧植入后 1周软骨形成 ,第 1～ 3组对照侧为纤维结缔组织 ;3周时各组实验侧均有较多的成熟骨组织 ,组织碱性磷酸酶 (alkalinephosphatase,AL P)染色均为阳性。各组对照侧材料被结缔组织包囊 ,AL P染色阴性 ,未见骨组织形成。各组实验侧材料AL P活性及磷 (phosphrus,P)检测水平明显高于相应的对照侧材料 ,实验侧与对照侧比较具有统计学意义 (P<0 .0 5 ) ,而 TCP/ BMP复合材料明显高于另 3种复合材料 ,有统计学意义 (P<0 .0 5 )。5、7周各实验侧及对照     

骨胶原的制备及作为骨形成蛋白载体修复骨缺损的研究

在提取BMP的过程中,从废去的中间产物骨基质胶中同时提取胶原作为BMP的载体用于修复兔颅骨缺损.40只大白兔随机分为A、B两组,在兔颅顶骨两侧对称各制造直径为1cm的圆形骨缺损,A组兔颅顶骨缺损左侧植入骨胶原/BMP,右侧植入单纯骨胶原,B组兔左侧植入BMP,右侧空白对照,组织学检查显示:植入后7夭,骨胶原/BMP组即有软骨细胞岛出现,旦在各期的成骨面积均大于单纯BMP组和胶原组.另外,移植材料内的灰量测定结果及X线摄片结果也表明,骨胶原/BMP的成骨量明显大于单纯骨胶原组和BMP组(P<0.01),认为骨胶原作为BMP的载体有更多的优越性.     

Evaluation of carriers of bone morphogenetic protein for spinal fusion

STUDY DESIGN: Posterolateral lumbar transverse process fusion in a rabbit model was performed using two different carriers for recombinant human morphogenetic protein-2, one having a porous structure and the other being a Type I collagen sheet. OBJECTIVES: To compare the effectiveness of two different carriers for recombinant human morphogenetic protein-2 in achieving lumbar intertransverse process arthrodesis. SUMMARY OF BACKGROUND DATA: The application of osteoinductive growth factors at various anatomic sites, such as in long bones and spinal segments, has been performed experimentally by many researchers. Although many carriers of osteoinductive factors have been reported, the most effective carrier has not been established. We have reported the efficacy of sintered bovine bone, True Bone Ceramics, which is coated with Type I collagen as a carrier of recombinant human bone morphogenetic protein-2 in achieving lumbar intertransverse process arthrodesis. True Bone Ceramics is a crystallized form of bone minerals made from sintering bovine bone at high temperatures and possesses natural trabecular structure. The crystalline character of True Bone Ceramics is similar to that of artificial hydroxyapatite. In this study we focused on the structure of two different carriers to facilitate osteosynthesis in lumbar arthrodesis. METHODS: Fifty-four adult rabbits underwent bilateral lumbar intertransverse process arthrodesis at L4-L5. The animals were divided into five groups and had implants placed as follows: Group 1, autograft group, harvested autologous corticocancellous bone from the posterior iliac crest; Group 2, TBC group, True Bone Ceramics alone; Group 3, TBC-TBMP group, True Bone Ceramics coated with Type I collagen infiltrated with 100 microg of recombinant human bone morphogenetic protein-2; Group 4, collagen group, Type I collagen sheet; and Group 5, collagen-BMP group, implanted collagen sheet containing 100 microg of recombinant human bone morphogenetic protein-2. Spinal fusion was evaluated by radiographic analysis, manual palpation, biomechanical testing, and histologic examination at both 3 and 6 weeks after surgery. RESULTS: Radiographs in the TBC-TBMP group showed a continuous trabecular pattern within the intertransverse area at 3 weeks after surgery. The fusion mass in the intertransverse area was more prominent than in the other groups. At 3 weeks after surgery the TBC-TBMP group had higher fusion rates based on manual palpation, and the fusions showed significantly higher tensile strength and stiffness. The histologic findings in the TBC-TBMP group at 3 weeks after surgery showed a cortical bone rim around the edge of the fusion mass, and contiguous new bone appearing between the recipient bone and the matrix of TBC without evidence of foreign body formation. In the collagen-BMP group, less mature bone formation was present within the grafted area and the new bone was not contiguous, even at 6 weeks after surgery. CONCLUSIONS: As a carrier for recombinant human bone morphogenetic protein-2, True Bone Ceramics, possessing a bony or porous structure, was more effective than a Type I collagen sheet in achieving a faster and stronger lumbar spinal fusion in a rabbit model.     

Does LED phototherapy influence the repair of bone defects grafted with MTA, bone morphogenetic proteins, and guided bone regeneration? A description of the repair process on rodents

This work carried out a histological analysis on bone defects grafted (MTA) treated or not with LED, BMPs, and membrane (GBR). Benefits of their isolated or combined usage on bone repair were reported, but not their association. Ninety rats were divided into ten groups and each subdivided into three. Defects on G II and I were filled with the blood clot. G II was further LED irradiated. G III and IV were filled with MTA; G IV was further LED irradiated. In G?V and VI, the defects were filled with MTA and covered with a membrane (GBR). G VI was further LED irradiated. In G VII and VIII, BMPs were added to the MTA and group VIII was further LED irradiated. In G IX and X, the MTA?+?BMP graft was covered with a membrane (GBR). G X was further LED irradiated. LED was applied over the defect at 48-h intervals and repeated for 15?days. Specimens were processed, cut, and stained with H&E and Sirius red and underwent histological analysis. The use of LED light alone dramatically reduced inflammation. However, its use on MTA associated with BMP and/or GBR increased the severity of the inflammatory reaction. Regarding bone reabsorption, the poorest result was seen when the LED light was associated with the MTA?+?BMP graft. In the groups Clot and MTA?+?GBR, no bone reabsorption was detectable. Increased collagen deposition was observed when the LED light was associated with the use of the MTA associated with BMP and/or GBR. Increased new bone formation was observed when the LED light was used alone or associated with the use of MTA?+?GBR, MTA?+?BMP, on association of MTA?+?BMP?+?GBR and when BMP was added to the MTA. Our results indicate that the use of LED light alone or in association with MTA, MTA?+?BMP, MTA?+?GBR, and MTA?+?BMP?+?GBR caused less inflammation, and an increase of both collagen deposition and bone deposition as seen on both histological and morphometric analysis.     

Telopeptide-depleted bovine skin collagen as a carrier for bone morphogenetic protein

The telopeptide of type I collagen is thought to be responsible for causing immunogenic response when introduced into xenogenic hosts. To eliminate this problem, solubilized bovine skin collagen was filtered through a millipore membrane, digested repeatedly with pepsin to remove telopeptides, and used as a carrier for a water-soluble, partially-purified fraction of bone morphogenetic protein (BMP) in mice. Composite implants of this telopeptide-depleted collagen and the partially-purified BMP fraction consistently elicited ectopic bone formation in mice 3 weeks postimplantation. When implanted alone, collagen or BMP failed to show this response. Collagens, prepared by use of conventional methods (acid-solubilized collagen, or collagen-digested once with pepsin) were also assessed as carriers for BMP, but were found to be inferior in terms of consistency of bone formation and amount of induced bone mass. The results suggest that telopeptide-depleted collagen permitted a gradual release of purified BMP for induction of bone, with minimal immunogenic interference. Consequently, this collagen carrier represents an important development for future clinical application of BMP.     

骨髓基质干细胞在骨形成蛋白诱导下异位成骨及应用于人造骨的实验研究

目的 研究经分离培养的骨髓基质干细胞（MSC）在骨形成蛋白（BMP）诱导下在体内外的异位成骨效应,为研制一种本身具有成骨能力的人造骨材料提供实验依据。方法 分离、培养Wistar大鼠MSC,体外实验将MSC＋BMP分别在培养板和弥散小室内培养,体内实验将MSC＋BMP与人工珊瑚骨（CHA）制成复合移植体,种植在大鼠背肌内,用形态学、组织化学和免疫组化方法观察其成骨效应。结果 MSC在体外（培养板和弥散小室）只形成软骨基质,在体内复合移植体（CHA＋BMP＋MSC）形成骨质,其成骨效应比对照组A（CHA＋MSC）和对照组B（CHA）强。结论 复合移植体（CHA＋BMP＋MSC）有可能被研制成本身具有成骨能力的人造骨材料。除BMP外,移植体植入的机体和局部还存在其它诱导成骨的因子,进一步探讨这些因子的作用,将对研制这种理想的人造骨材料具有重要意义。     

胶原蛋白膜作为金葡液载体修复骨缺损的实验研究

目的 验证胶原蛋白膜吸附金葡液后修复骨缺损的优越性。方法 选用成年新西兰大白兔24只，随机分为2组，每组12只。手术造成桡骨标准缺损后，分别植入胶原蛋白一金葡液复合体(实验组)和单纯等量金葡液(对照组)，于术后2、4、6及8周时行大体、X线片、组织学及免疫组织化学观察。结果 整个过程中实验组缺损区新生骨组织增殖明显、持续时间较长，且无过量结缔组织生长；X线片可见连续性骨痂通过缺损区，分布均匀；组织学观察可见多个成骨中心，骨小梁排列有序，成熟骨替代完全；免疫组织化学染色可见骨形成蛋白分布持续时间长，而且在新骨组织中占据范围大。对照组缺损区新生骨组织在质量和数量上都较实验组差。结论 胶原蛋白能够阻挡周围软组织进入缺损区，为新骨生长提供空间；同时作为金葡液的载体，能减少金葡液外溢，提高其疗效。     

自体微小颗粒骨复合骨形成蛋白修复兔桡骨缺损

目的探讨自体微小颗粒骨复合I型胶原以及骨形成蛋白(bone morphogenetic protein，BMP)移植修复节段性兔桡骨缺损的效果。方法新西兰大耳白兔56只，切取自体髂骨研磨成微小颗粒，分别与BMP及I型胶原复合，实验分成4组（n=16)。A组：自体微小颗粒骨复合BMP、I型胶原，B组：自体微小颗粒骨复合I型胶原，C组：自体微小颗粒骨，用于修复兔桡骨干1．5cm缺损的动物模型。D组：空白对照组(n=8)，双侧桡骨缺损不作处理。术后2、4、8和12周，行X线片、组织学观察，骨密度及生物力学检测，比较各移植物修复节段性骨缺损的疗效。结果X线片显示，A组术后8周即可使骨缺损完全修复，而B组术后12周使骨缺损完全修复。术后8、12周骨量测定A组成骨量最多，12周生物力学测定显示移植物修复后的骨缺损具有最佳生物力学表现，而C组则不能完全修复骨缺损。结论自体微小颗粒骨复合BMP、I型胶原及自体微小颗粒骨复合I型胶原均能有效修复节段性骨缺损，以复合BMP移植效果更理想。     

重组胶原矿化骨负载骨形态发生蛋白2活性多肽复合材料的制备及其异位成骨研究

目的 构建重组胶原矿化骨/BMP2活性多肽新型仿生骨修复材料,并评价其异位成骨能力.方法 将48只成年SD大鼠随机分为4组,在A、B、C组的大鼠背部肌肉内分别植入含3、2、1 nag BMP2活性多肽的重组胶原矿化骨;在D组的大鼠背部肌肉内植入单纯重组胶原矿化骨,于4、8和12周时间点将大鼠处死,经CT三维重建、组织学观察及钙含龟测定检测植入材料的成骨情况.结果 A、B.C组,在各时间点的CT三维重建、组织学观察及钙含量检测结果均表明其异位成骨能力优于D组,差异有统计学意义(P<0.01),其中A、B两组的异位成骨能力优于C组,差异有统计学意义(P<0.01).结论 BMP2活性多肽町以显著增强重组胶原矿化骨的骨诱导活性,这种骨诱导性存在一定的剂量效应关系.