Name: an efficient and reproducible protocol for distraction osteogenesis in a rat model leading to a functional regenerated femur
Uploaded: 2017-10-23T15:00:00.000+00:00
Duration: 9 min 26 s
Description: Watch this Scientific Journal Video about An Efficient and Reproducible Protocol for Distraction Osteogenesis in a Rat Model Leading to a Functional Regenerated Femur at JoVE.com

这项工作得到了 CNRS Mecabio 挑战的支持和资助。
作者感谢动物护理技术员在整个过程中照顾动物。作者还通过 IVTV 承认里昂中心。感谢马乔里 Sweetko 的语言版本。
我们感激 Marylène Lallemand、Cécile Génovésio 和帕特里克. 劳伦对这项实验研究的贡献。

所描述的所有程序均由 Aix-马赛机构动物保育和使用委员会和法国研究部批准, 并在马赛医学院的常规动物院进行 (法国). 
 1. 根据以下准则定义外部固定器的功能规范 <ol> <li> 优化骨骼锚固. 
	<ol> <li> 植入 half-threaded 针脚, 其直径 (螺纹部分) 为 1 mm. </li>
	</ol> </li> <li> 选择设计以减少对动物的不适. 
	<ol> <li> 选择适合于 7723 mm 3 (32 mm x 19 mm x 12.7 mm) 的体积的小尺寸的外部固定器。
		<li> 选择一个低重量的外固定器, 不带针脚的13克, 避免干扰动物和 #39; 步态。选择铝作为材料的两个区块由于其低密度. 
		注: 倒块的重量大大降低了两部分的比重. </li>
	</ol> </li> <li> 控制固定器的运动, 使拉伸力的方向与骨骼的方向保持平行, 并确保纯拉伸力。
	<ol> <li> 使用穿过两个块的滑动条。槽和开放的方块, 使每个可以承担两个引脚. </li>
		<li> 使用一个平滑侧的延伸螺钉, 在块中自由转动, 可以用手指夹住, 并通过旋转使第二块偏移的螺纹侧。将两根针固定在骨折的两侧, 使拉力方向与骨骼方向平行。保持纵向轴的拉伸力, 使销钉上的应力分布良好。用锁定螺钉固定四针脚. </li>
	</ol> </li> <li> 选择可以经受灭菌温度的铝、钛和钢等材料. </li>
	<li> 确保针放置对应于外部固定架几何 ( 图 1 B )。
	<ol> <li> 使用一个钻孔导轨, 其中包含在骨骼上拧紧的夹具以保持钻孔位置. </li>
		<li> 缩短夹具的杠杆臂以降低夹紧力。将夹钳放在装置中间, 在以后的骨折处, 以清除两侧. </li>
	</ol> </li> <li> 通过添加花螺钉来拧紧和松开移动块, 使分散操作易于手动调整. 
	<ol> <li> 使用的螺钉宽度足以用手指单独操作. </li>
		<li> 在两个块之间的延伸螺钉中间添加一个钻孔方形螺母, 以便轻松分散. </li>
		<li> 使此方形螺母 (每边 8 mm) 大于两个块, 以允许手动使用细针或任何类型的对象。转动螺丝和 #188; 转动以允许0.125 毫米延长. </li>
	</ol> </li> </ol> 2。手术 注意: 所有外科手术都需要一个助手。四12周大的雄性大大鼠被喂食标准的实验室食谱 ad 随意 . 
<ol> <li> 准备手术工具. 
	<ol> <li> 对以下所有手术器械进行消毒: 1 rugine、2森和 #39 器、1微奥尔森 Hegar 针夹、1梅奥 Hegar 针支架、1梅奥剪刀和1手术刀. </li>
		<li> 消毒外固定架, 钻孔导轨, 4 half-threaded 针, 4 螺丝, 尖端和钻柱, 以及 piezotome 的尖端和串。灭菌135和 #176 对这些仪器进行消毒; C 为 18 min. </li>
		<li> 在无菌场、手术台上安装一个发热垫。将所有仪器或工具放在另一个不育的领域. </li>
	</ol> </li> <li> 麻醉并准备该动物. 
	<ol> <li> 称量大鼠准备麻醉剂和镇痛合剂 </li> <li> 确定并计算 Bupremorphine 和卡洛芬的用量, 准备镇痛合剂即兴。使用丁丙诺啡 (0.03 毫克/毫升) 和卡洛芬 (5 毫克/毫升) 分别在0.05 毫克/千克和5毫克/千克. </li>
		<li> 抑制大鼠和皮下注射镇痛合剂. #160; 等待几秒钟, 然后注射腹腔麻醉合剂. </li>
		<li> 用电动剃须刀剃掉右后肢, 用聚维酮碘溶液消毒肢体. </li>
		<li> 在无菌场上横向 (右侧向上) 放置动物, 以便在 mediolateral 轴上正确定位外固定架. </li>
		在手术过程中, <li> 在头部放置一个不育的压缩来保护眼睛. </li>
	</ol> </li> <li> 将外部固定器植入股骨。
	<ol> <li> 标志性皮肤切口。用一个标记, 从远端部分 (膝部) 和第二个点 (髋部) 在矢状面中中线的后面绘制一个点。然后在这2点之间画一条线. </li>
		<li> 使用手术刀沿绘图线切割拉伸的皮肤. </li>
		<li> 在 股二头肌之间切开 和 股外 , 直到股骨完全暴露在手术刀的帮助下。使用2森和 #39 器 (可能需要助手) 来促进肌肉切开. </li>
		<li> 抬起骨膜并在 rugine 的帮助下从骨骼中断开软组织. </li>
		<li> 检查裸露的股骨是否足够长。
		<ol> <li> 在外部固定器的最近端和远端孔中插入针脚. </li>
			<li> 定位外固定器并检查两个针脚是否可以固定在股骨上. </li>
		</ol> </li> <li> 在股骨中植入4平行的1毫米 half-threaded 针。
		<ol> <li> 采用钻孔导轨, 将2森和 #39 的肌肉分开; 器。拧紧股骨中部的钻孔导轨夹钳. </li>
			<li> 在股骨中钻 4 pre-holes。使用电钻, 钻孔的速度为 2000 rpm 通过一个金属钻头0.6 毫米直径通过4导孔。
			<ol> <li> 从最近端和远端的孔开始, 并完成指南中的两个中间部分。小心地穿过两个皮质, 但不要破坏股骨下方的软组织. </li>
			</ol> </li> <li> 从钻孔导轨上脱下. </li>
			<li> 放大 4 pre-holes 与 0.8 mm half-threaded 针。
			<ol> <li> 通过 0.6 mm 孔来回工作 pin。小心保持垂直于股骨和下沉通过两个皮质. </li>
			</ol> </li> <li> 植入 1 mm half-threaded 针脚。
			<ol> <li> 用针夹抓住 1 mm half-threaded 针脚的头. </li>
				<li> 下沉引脚以放大 pre-hole。检查针脚是否穿透两个皮层, 并不凸出超过1毫米, 与森和 #39; s 牵引器. </li>
			</ol> </li> <li> 将外部固定器连接到 4 half-threaded 针脚。确保偏移量 (固定架与 #39 之间的距离, 两个块和骨表面) 约6毫米, 以便于缝合和系统的良好刚性 18 . </li>
			<li> 固定4锁定螺钉, 使外部固定器锁定在针脚上. </li>
		</ol> </li> </ol> </li> <li> Osteotomize 股骨. 
	<ol> <li> 在2中心针脚与 piezotome 之间执行截骨. </li>
		<li> 关闭禾和使用一个连续针与可缝合线 (5.0) 和梅奥-Hegar 针持有人。确保只有皮肤缝合, 而不是肌肉. </li>
	</ol> </li> <li> 验证手术和监视动物. 
	<ol> <li> 在手术后执行 X 光检查, 而动物仍在麻醉中。检查所有针脚的深度, osteotomized 的肢沿长轴排列. </li>
		<li> 通过皮下注射丁丙诺啡 (0.03 毫克/毫升) 和 Enrofloxacine (50 毫克/毫升) 分别在0.05 毫克/千克和10毫克/千克 #160 确保镇痛和 antibioprophylaxy; </li>
		<li> 确定并计算用于反转麻醉的 antipamezole 量。使用 antipamezole 在1毫克/千克和做皮下注射管理产品。和 #160; 允许动物重拾意识并将它归还给它的笼子. </li>
		<li> 手术后六小时, 分别在 0.05mg/千克和5毫克/千克皮下注射第二剂量的镇痛合剂 (丁丙诺啡和卡洛芬); #160; 
		至少在接下来的3天里, 每天给这些注射两次镇痛合剂, 每天一次, 为 antibioprophylaxy。必须定期进行临床检查以评估镇痛的有效性, 并且必须根据每种动物的行为体征进行修改。和 #160; </li> <li> 检查动物是否可以在手术后的第二天正常行走. </li>
	</ol> </li> </ol> 3。分心 <ol> <li> 在1周内将外固定器保持在中性点。x 射线的肢体在这一阶段结束。检查针脚的位置和骨骼段的对齐方式. </li>
	<li> 手动将方形螺母旋转一半 (0.25 mm), 每12小时顺时针转动一次以执行分心。分心10天, 这将导致一个5mm 的骨骼延长, 代表了12% 延长相对于手术骨段的初始长度. 
	在此步骤中, <ol> <li> 不麻醉动物。x 射线的肢体中途通过和在这段时间结束检查的定位针和对齐骨段. </li>
	</ol> </li> <li> 将外部固定架保持47天。x 线每周检查肢体的进展, 注意力分散的间隙钙化。64天, 取出外固定架, 让动物自由行走2天 (66 天)。总合并期持续7周. </li>
	<li> 安乐所有老鼠经过7周的整合, 过量吸入七氟醚. </li>
	<li> 在没有周围组织的情况下切除分心和对侧股骨. 
	<ol> <li> 在手术刀的帮助下, 在矢状面后的中线上的疤痕上进行皮肤切口。从臀部顶端到膝前部的切口. </li>
		<li> 在 股二头肌 和 股外 与手术刀之间切开直到股骨完全暴露。尽可能地断开附着在骨骼上的肌肉. </li>
		<li> 切断所有膝关节韧带, 并拆除关节. </li>
		<li> 切开髋关节的关节囊. </li>
		<li> 彻底清洁骨骼而不删除 half-threaded 针脚。用手术刀取出所有的软组织. </li>
	</ol> </li> <li> 对对侧股骨重复从3.5.1 到3.5.5 的步骤. </li>
	<li> x 光分心和对侧股骨。卸下 4 half-threaded 针脚, 并将所有股骨存储在-20 和 #176 上; C 用于微 CT 扫描分析 (10 和 #181; m 分辨率). </li>
</ol>

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作者没有什么可透露的。

这项研究描述了一个可复制的协议, 包括一个适当的外固定器设计的大鼠肢体延长, 与详细的手术技术, 允许动物的生理负重后, 去除外固定架。我们的协议导致了一个功能性的再生骨骼。经过47天的巩固, 去除自制的外固定器和2天的生理负重, 动物并没有诱发任何骨折的再生愈伤组织。由于微 CT 重建, 完全架桥的证据证实了再生愈伤组织的功能。先前的研究清楚地证明了钙化桥接的存在与再生愈伤?...

牵引成骨术 (做) 是一种外科技术广泛使用临床1,2,3,4在人为更低的1,2和上部3肢体延长,治疗后骨不连, 或再生骨缺损后骨肿瘤切除术以及颌面部重建4。在骨内固定支架置入后, 可导致骨再生。osteotomized 四肢通过逐渐分心2 , 以达到预期的伸长距离。巩固期间跟随, 在期间没有更多伸长。
执行过程分为三不同的阶段: 延迟、分心和整合。通常, 7 天的潜伏期是在截骨4之后开始的。这允许骨骼修复开始愈合过程的初始步骤4。潜伏期后, 牵引力被应用到再生愈伤组织和周围软组织的一个分心期1,2,4。当达到预期的伸长率, 分心停止和巩固期开始。在此期间, 外固定器保持, 直到再生骨功能足以支持其去除。
不同的参数对骨修复有影响, 如长度和伸长率, 外固定器的类型, 分心的频率, 巩固期的长短, 或机械应力类型应用于分散的愈伤组织。举例来说, 延长的速度和频率可能导致过早的合并5或通过创建不可恢复的损伤, 如坏死组织或囊肿在胼胝体内,6,7。
许多协议已经应用于不同的动物模型8,9,10 , 以研究骨骼修复过程并最大限度地巩固骨骼。在大鼠中, 大多数研究11、12、13、14、15 , 重点讨论如何通过加速愈伤组织合并来缩短执行协议。其中一些实验研究使用了外部固定架已经商业化可用于人类临床应用的5,13,15,16。然而, 这些类型的外固定器不适合做的大鼠股骨, 这表现出不同的解剖特征, 从人的股骨。此外, 只有少数研究清楚地证明了它们的协议在获得功能性再生骨716中的效率。因此, 很难比较不同的研究结果, 由于他们的不同协议和缺乏有关外部固定器的信息12,13,14,17。
因此, 这项研究的目的是描述, 在大鼠模型, 一个有效的和可重复的协议做股骨, 导致功能性再生骨。为此, 我们设计了一个自制和易于使用的外固定器, 特别是对大鼠股骨, 这是我们在这个协议中详细描述。在起草该装置的技术规格时, 我们考虑到了机械应力分布良好和避免残余应力产生的所有基本约束。技术规格包括一个适当的几何为设备允许纯净的牵引力量在骨头和周围的组织, 适当的重量为动物的步态, 控制骨头伸长的长度和好对骨头段的对准在销钉和骨骼的交叉处不产生剪切应力。此外, 该装置必须在不受干扰、生物相容性和消毒无损伤的情况下使用。经过7周的整合后, 本议定书对大鼠股骨做了一个功能性再生骨, 证明了动物的生理负重没有骨折的再生愈伤组织后外固定架。动物的生理步态与再生愈伤组织和 x 射线分析的显微 CT 分析得到的建筑参数一致。

<table><tbody><tr><td>K&amp;eacute;tamine</td><td>Renaudin</td><td>578 540-2</td><td>Supply by animal house</td></tr><tr><td>M&amp;eacute;d&amp;eacute;tomidine</td><td>Virbac</td><td>6799091</td><td>Supply by animal house</td></tr><tr><td>Sevoflurane</td><td>Centravet</td><td>567 477-2</td><td>Supply by animal house</td></tr><tr><td>Buprenorphine</td><td>Indivor France</td><td>3400932731060</td><td>Supply by animal house</td></tr><tr><td>Enrofloxacine</td><td>ChannelPharmaceutical Facturing</td><td>FR/V/4955220</td><td>Supply by animal house</td></tr><tr><td>Piezotome</td><td>Satelec Acteon</td><td>F57510</td><td></td></tr><tr><td>Heating pet pad</td><td>Therasage</td><td>AL8365936</td><td>Supply by the animal house</td></tr><tr><td>Dental X-ray</td><td>S.A.R.L Innovation m&amp;eacute;dicales et dentaires</td><td>WYZ - BLUEX</td><td></td></tr><tr><td>Winiwix Software</td><td>Softys Dental</td><td>PFT</td><td></td></tr><tr><td>Micro-CT system</td><td>nanoScan SPECT/CT</td><td>GEIT-31105EN (05/14)</td><td>Subcontract by IVTV central Lyon</td></tr><tr><td>Micro-CT analysis Software</td><td>phoenix datos X2 reconstruction</td><td>none</td><td>Free software</td></tr><tr><td>Electric razor</td><td>Brawn</td><td>GT415</td><td>Supply by animal house</td></tr><tr><td>Senn&amp;rsquo;s retractors</td><td>Word Precision Instruments</td><td>501718</td><td>Blunt version</td></tr><tr><td>Betadine Solution</td><td>Mundipharma Medical Company</td><td>D08AG02</td><td>Supply by animal house</td></tr><tr><td>Resorbable suture thread (5.0)</td><td>Ethicon</td><td>JV1023</td><td>Supply by animal house</td></tr><tr><td>Rugine</td><td>Word Precision Instruments</td><td>503406</td><td></td></tr><tr><td>Mayo-Hegar needle holder</td><td>Word Precision Instruments</td><td>V503382</td><td></td></tr><tr><td>Metal drill</td><td>Beuterlock</td><td>V020944018003</td><td></td></tr><tr><td>Micro Olsen-Hegar Needle-holder</td><td>Word Precision Instruments</td><td>501989</td><td></td></tr><tr><td>Mayo scissor</td><td>Word Precision Instruments</td><td>501752</td><td></td></tr><tr><td>Scalpel</td><td>Word Precision Instruments</td><td>500236</td><td></td></tr><tr><td>Sprague-Dawley</td><td>Janvier</td><td>none</td><td>12 weaks and male</td></tr></tbody></table>

an efficient and reproducible protocol for distraction osteogenesis in a rat model leading to a functional regenerated femur

本协议描述了在大鼠股骨模型中使用一种新研制的外固定器牵引成骨术。牵引成骨术 (做) 是一种外科手术技术, 导致骨再生后, 截切。osteotomized 肢通过逐渐的分散而相互移动, 达到预期的伸长率。该方法广泛应用于人下肢延长, 骨不连后治疗, 或骨肿瘤切除术后骨缺损的再生, 以及颌面部重建。只有少数的研究清楚地证明了他们的协议在获得功能性再生骨的效率,即, 在取出外固定架后, 将支持不带骨折的生理负重的骨骼。此外, 由于缺乏信息, 使得不同的研究和重复性的协议受到限制, 使学习比较困难。本研究的目的是制定一个可复制的协议, 包括一个适当的外固定器设计大鼠肢体延长, 与详细的手术技术, 允许动物的生理负重后, 去除外部固定.

从外科手术结束到合并结束的 x 线图像显示, 股骨 half-threaded 针没有松动, 表明稳定的锚固。别针是平行和保存完好。在执行过程中, osteotomized 肢沿骨骼的纵轴定向 (图 2)。在潜伏期结束时, 没有钙化区域是可见的 (图 2B)。在分心期结束时, 一些钙化区可见于先前存在的皮层 (图 2C)?...

Watch this Scientific Journal Video about An Efficient and Reproducible Protocol for Distraction Osteogenesis in a Rat Model Leading to a Functional Regenerated Femur at JoVE.com

An Efficient and Reproducible Protocol for Distraction Osteogenesis in a Rat Model Leading to a Functional Regenerated Femur

大鼠牵张成骨的高效可再生性协议

这项研究描述了一个可复制和详细的协议使用新开发的外固定器的牵引成骨 (做) 在股骨大鼠模型, 允许生理负重的动物后, 外固定架。

This protocol describes the use of a newly developed external fixator for distraction osteogenesis in a rat femoral model. Distraction osteogenesis (DO) ...

an-efficient-reproducible-protocol-for-distraction-osteogenesis-rat

Research

JoVE Journal

Bioengineering

7.4K 次观看.  Aix Marseille Univ. 这项研究描述了一个可复制和详细的协议使用新开发的外固定器的牵引成骨 (做) 在股骨大鼠模型, 允许生理负重的动物后, 外固定架。

视频: An Efficient and Reproducible Protocol for Distraction Osteogenesis in a Rat Model Leading to a Functional Regenerated Femur

Use of Human Perivascular Stem Cells for Bone Regeneration

Human perivascular stem cells (PSCs) can be isolated in sufficient numbers from multiple tissues for purposes of skeletal tissue engineering1-3. PSCs are a FACS-sorted population of 'pericytes' (CD146+CD34-CD45-) and 'adventitial cells' (CD146-CD34+CD45-), each of which we have previously reported to have properties of mesenchymal stem cells. PSCs, like MSCs, are able to undergo osteogenic differentiation, as well as secrete pro-osteogenic cytokines1,2. In the present protocol, we demonstrate the osteogenicity of PSCs in several animal models including a muscle pouch implantation in SCID (severe combined immunodeficient) mice, a SCID mouse calvarial defect and a femoral segmental defect (FSD) in athymic rats. The thigh muscle pouch model is used to assess ectopic bone formation. Calvarial defects are centered on the parietal bone and are standardly 4 mm in diameter (critically sized)8. FSDs are bicortical and are stabilized with a polyethylene bar and K-wires4. The FSD described is also a critical size defect, which does not significantly heal on its own4. In contrast, if stem cells or growth factors are added to the defect site, significant bone regeneration can be appreciated. The overall goal of PSC xenografting is to demonstrate the osteogenic capability of this cell type in both ectopic and orthotopic bone regeneration models.

Human perivascular stem cells (PSCs) are a novel stem cell class for skeletal tissue regeneration similar to mesenchymal stem cells (MSCs). PSCs can be isolated by FACS (fluorescence activated cell sorting) from adipose tissue procured during standard liposuction procedures, then combined with an osteoinductive scaffold to achieve bone formation in vivo.

人类血管周围干细胞用于骨再生

Human perivascular stem cells (PSCs) can be isolated in sufficient numbers from multiple tissues for purposes of skeletal tissue engineering1-3. PSCs are ...

科研

生物工程

Creating Rigidly Stabilized Fractures for Assessing Intramembranous Ossification, Distraction Osteogenesis, or Healing of Critical Sized Defects

Assessing modes of skeletal repair is essential for developing therapies to be used clinically to treat fractures. Mechanical stability plays a large role in healing of bone injuries. In the worst-case scenario mechanical instability can lead to delayed or non-union in humans. However, motion can also stimulate the healing process. In fractures that have motion cartilage forms to stabilize the fracture bone ends, and this cartilage is gradually replaced by bone through recapitulation of the developmental process of endochondral ossification. In contrast, if a bone fracture is rigidly stabilized bone forms directly via intramembranous ossification. Clinically, both endochondral and intramembranous ossification occur simultaneously. To effectively replicate this process investigators insert a pin into the medullary canal of the fractured bone as described by Bonnarens4. This experimental method provides excellent lateral stability while allowing rotational instability to persist. However, our understanding of the mechanisms that regulate these two distinct processes can also be enhanced by experimentally isolating each of these processes. We have developed a stabilization protocol that provides rotational and lateral stabilization. In this model, intramembranous ossification is the only mode of healing that is observed, and healing parameters can be compared among different strains of genetically modified mice 5-7, after application of bioactive molecules 8,9, after altering physiological parameters of healing 10, after modifying the amount or time of stabilization 11, after distraction osteogenesis 12, after creation of a non-union 13, or after creation of a critical sized defect. Here, we illustrate how to apply the modified Ilizarov fixators for studying tibial fracture healing and distraction osteogenesis in mice.

This article describes a method for stabilizing long bone fractures that is based on the application of modified Ilizarov external fixators 1-3. After application of the fixators and creation of the bone injury, healing can be assessed, distraction osteogenesis can be performed, or non-union or critical sized defect can be created and used to study therapeutic interventions.

建立评估膜内骨化硬性稳定骨折，牵张成骨，或临界中小企业缺损愈合

Assessing modes of skeletal repair is essential for developing therapies to be used clinically to treat fractures. Mechanical stability plays a large role ...

医学

A Mouse Distraction Osteogenesis Model

Distraction osteogenesis (DO) is a surgical procedure that involves skeletal tissue regeneration without cell transplantation. A DO model consists of the following three phases: the latency phase after osteotomy and placement of the external distractor; the distraction phase, wherein the separated bone ends are gradually and continuously distracted; and the consolidation phase. This custom-made distractor used for DO is comprised of two incomplete acrylic resin rings and an expansion screw. The process was initiated by making a mold with silicone impression material and then creating the custom-made distractor. Dental resin was poured into the formwork made of silicone impression material, and it was allowed to polymerize to create the incomplete resin rings required for the custom-made distractor. These rings were fixed with an expansion screw using transparent resin. The custom-made distractor created via this approach was attached to the tibia of mice. The tibia was fixed to the device using one pair of 25 G needles proximally, one pair of 27 G needles distally, and acrylic resin. After a latency period of 5 days, distraction was initiated at a rate of 0.2 mm/12 h. The lengthening was continued for 8 days, resulting in a total gap of 3.2 mm. The mice were sacrificed 4 weeks after distraction. Bone formation in the distraction gap was confirmed using both radiography and histology.

We present a mouse tibial distraction osteogenesis model developed using a custom-made distractor. The use of a mouse as an analysis target is advantageous for advancing research.

小鼠牵张成骨模型

Distraction osteogenesis (DO) is a surgical procedure that involves skeletal tissue regeneration without cell transplantation. A DO model consists of the ...

发育生物学

Adjustable Stiffness, External Fixator for the Rat Femur Osteotomy and Segmental Bone Defect Models

The mechanical environment around the healing of broken bone is very important as it determines the way the fracture will heal. Over the past decade there has been great clinical interest in improving bone healing by altering the mechanical environment through the fixation stability around the lesion. One constraint of preclinical animal research in this area is the lack of experimental control over the local mechanical environment within a large segmental defect as well as osteotomies as they heal. In this paper we report on the design and use of an external fixator to study the healing of large segmental bone defects or osteotomies. This device not only allows for controlled axial stiffness on the bone lesion as it heals, but it also enables the change of stiffness during the healing process in vivo. The conducted experiments have shown that the fixators were able to maintain a 5 mm femoral defect gap in rats in vivo during unrestricted cage activity for at least 8 weeks. Likewise, we observed no distortion or infections, including pin infections during the entire healing period. These results demonstrate that our newly developed external fixator was able to achieve reproducible and standardized stabilization, and the alteration of the mechanical environment of in vivo rat large bone defects and various size osteotomies. This confirms that the external fixation device is well suited for preclinical research investigations using a rat model in the field of bone regeneration and repair.

One constraint of preclinical research in the field of bone repair is the lack of experimental control over the local mechanical environment within a healing bone lesion. We report the design and use of an external fixator for bone repair with the ability to change fixator stiffness in vivo.

可调节刚度，外固定支架的大鼠股骨截骨和节段性骨缺损模型

The mechanical environment around the healing of broken bone is very important as it determines the way the fracture will heal. Over the past decade there ...

Establishment of a Segmental Femoral Critical-size Defect Model in Mice Stabilized by Plate Osteosynthesis

The use of tissue-engineered bone constructs is an appealing strategy to overcome drawbacks of autografts for the treatment of massive bone defects. As a model organism, the mouse has already been widely used in bone-related research. Large diaphyseal bone defect models in mice, however, are sparse and often use bone fixation which fills the bone marrow cavity and does not provide optimal mechanical stability. The objectives of the current study were to develop a critical-size, segmental, femoral defect in nude mice. A 3.5-mm mid-diaphyseal femoral ostectomy (approximately 25% of the femur length) was performed using a dedicated jig, and was stabilized with an anterior located locking plate and 4 locking screws. The bone defect was subsequently either left empty or filled with a bone substitute (syngenic bone graft or coralline scaffold). Bone healing was monitored noninvasively using radiography and in vivo micro-computed-tomography and was subsequently assessed by ex vivo micro-computed-tomography and undecalcified histology after animal sacrifice, 10 weeks postoperatively. The recovery of all mice was excellent, a full-weight-bearing was observed within one day following the surgical procedure. Furthermore, stable bone fixation and consistent fixation of the implanted materials were achieved in all animals tested throughout the study. When the bone defects were left empty, non-union was consistently obtained. In contrast, when the bone defects were filled with syngenic bone grafts, bone union was always observed. When the bone defects were filled with coralline scaffolds, newly-formed bone was observed in the interface between bone resection edges and the scaffold, as well as within a short distance within the scaffold. 
The present model describes a reproducible critical-size femoral defect stabilized by plate osteosynthesis with low morbidity in mice. The new load-bearing segmental bone defect model could be useful for studying the underlying mechanisms in bone regeneration pertinent to orthopaedic applications.

Although mouse models are invaluable tools for bone tissue engineering, models of long bone defects are sparse. This need motivated development of the present protocol which uses a locking plate with four screws and a dedicated jig to perform and stabilize a reproducible, femoral, critical-size defect with low morbidity.

在小鼠节段性股临界尺寸缺陷模型的建立接骨板稳定

The use of tissue-engineered bone constructs is an appealing strategy to overcome drawbacks of autografts for the treatment of massive bone defects. As a ...

A Reliable and Reproducible Critical-Sized Segmental Femoral Defect Model in Rats Stabilized with a Custom External Fixator

Orthopedic research relies heavily on animal models to study mechanisms of bone healing in vivo as well as investigate the new treatment techniques. Critical-sized segmental defects are challenging to treat clinically, and research efforts could benefit from a reliable, ambulatory small animal model of a segmental femoral defect. In this study, we present an optimized surgical protocol for the consistent and reproducible creation of a 5 mm critical diaphyseal defect in a rat femur stabilized with an external fixator. The diaphyseal ostectomy was performed using a custom jig to place 4 Kirschner wires bicortically, which were stabilized with an adapted external fixator device. An oscillating bone saw was used to create the defect. Either a collagen sponge alone or a collagen sponge soaked in rhBMP-2 was implanted into the defect, and the bone healing was monitored over 12 weeks using radiographs. After 12 weeks, rats were sacrificed, and histological analysis was performed on the excised control and treated femurs. Bone defects containing only collagen sponge resulted in non-union, while rhBMP-2 treatment yielded the formation of a periosteal callous and new bone remodeling. Animals recovered well after implantation, and external fixation proved successful in stabilizing the femoral defects over 12 weeks. This streamlined surgical model could be readily applied to study bone healing and test new orthopedic biomaterials and regenerative therapies in vivo.

In vivo mammalian models of critical-sized bone defects are essential for researchers studying healing mechanisms and orthopedic therapies. Here, we introduce a protocol for the creation of reproducible, segmental, femoral defects in rats stabilized using external fixation.

一种可靠、可重复的可重复的大鼠部分股骨缺陷模型

Orthopedic research relies heavily on animal models to study mechanisms of bone healing in vivo as well as investigate the new treatment techniques. ...

An Intramedullary Locking Nail for Standardized Fixation of Femur Osteotomies to Analyze Normal and Defective Bone Healing in Mice

Bone healing models are essential to the development of new therapeutic strategies for clinical fracture treatment. Furthermore, mouse models are becoming more commonly used in trauma research. They offer a large number of mutant strains and antibodies for the analysis of the molecular mechanisms behind the highly differentiated process of bone healing. To control the biomechanical environment, standardized and well-characterized osteosynthesis techniques are mandatory in mice. Here, we report on the design and use of an intramedullary nail to stabilize open femur osteotomies in mice. The nail, made of medical-grade stainless steel, provides high axial and rotational stiffness. The implant further allows the creation of defined, constant osteotomy gap sizes from 0.00 mm to 2.00 mm. Intramedullary locking nail stabilization of femur osteotomies with gap sizes of 0.00 mm and 0.25 mm result in adequate bone healing through endochondral and intramembranous ossification. Stabilization of femur osteotomies with a gap size of 2.00 mm results in atrophic non-union. Thus, the intramedullary locking nail can be used in healing and non-healing models. A further advantage of the use of the nail compared to other open bone healing models is the possibility to adequately fix bone substitutes and scaffolds in order to study the process of osseous integration. A disadvantage of the use of the intramedullary nail is the more invasive surgical procedure, inherent to all open procedures compared to closed models. A further disadvantage may be the induction of some damage to the intramedullary cavity, inherent to all intramedullary stabilization techniques compared to extramedullary stabilization procedures.

This protocol describes an osteosynthesis technique using an intramedullary locking nail for standardized fixation of femur osteotomies, which can be used to analyze normal and defective bone healing in mice.

髓内锁钉股骨截骨标准化固定用于分析正常和有缺陷的骨愈合小鼠

Bone healing models are essential to the development of new therapeutic strategies for clinical fracture treatment. Furthermore, mouse models are becoming ...

Protocol for Developing a Femur Osteotomy Model in Wistar Albino Rats

Fracture healing is a physiological process resulting in the regeneration of bone defects by the coordinated action of osteoblasts and osteoclasts. Osteoanabolic drugs have the potential to augment the repair of fractures but have constraints like high costs or undesirable side effects. The bone healing potential of a drug can initially be determined by in vitro studies, but in vivo studies are needed for the final proof of concept. Our objective was to develop a femur osteotomy rodent model that could help researchers understand the development of callus formation following fracture of the shaft of the femur and that could help establish whether a potential drug has bone healing properties. Adult male Wistar albino rats were used after Institutional Animal Ethics Committee clearance. The rodents were anesthetized, and under aseptic conditions, complete transverse fractures at the middle one-third of the shafts of the femurs were created using open osteotomy. The fractures were reduced and internally fixed using intramedullary K-wires, and secondary fracture healing was allowed to take place. After surgery, intraperitoneal analgesics and antibiotics were given for 5 days. Sequential weekly x-rays assessed callus formation. The rats were sacrificed based on radiologically pre-determined time points, and the development of the fracture callus was analyzed radiologically and using immunohistochemistry.

Here, we present a protocol to iatrogenically fracture the shaft of the femur of Wistar albino rats and follow up on the development of the callus. This femur osteotomy model can help researchers evaluate the process of fracture healing and to study how a drug could influence fracture healing.

开发Wistar白化大鼠股骨截骨模型的协议

Fracture healing is a physiological process resulting in the regeneration of bone defects by the coordinated action of osteoblasts and osteoclasts. ...

大鼠股骨盒的建立和评估:空腔缺陷模型

Creating a Box-Cavity Defect Model in the Cortical Bone of Rat Femora

Severe bone defects or complex fractures can result in serious complications such as nonunion or insufficient bone healing. Tissue engineering, which involves the application of cells, scaffolds, and cytokines, is considered a promising solution for bone regeneration. Consequently, various animal models that simulate bone defects play a crucial role in exploring the therapeutic potential of tissue engineering for bone healing. In this study, we established a box-shaped cortical bone defect model in the mid-femur of rats, which could serve as an ideal model for assessing the function of biomaterials in promoting bone healing. This box-shaped cortical bone defect was drilled using an oral low-speed handpiece and shaped by a lathe needle. Post-operative micro-CT analysis was immediately conducted to confirm the successful establishment of the box-cavity cortical bone defect. The femurs on the operated side of the rats were then harvested at multiple time points post-surgery (0 days, 2 weeks, 4 weeks, and 6 weeks). The healing process of each sample&#39;s defect area was evaluated using micro-CT, hematoxylin and eosin (H&#38;E) staining, and Masson trichrome staining. These results demonstrated a healing pattern consistent with intramembranous ossification, with healing essentially complete by 6 weeks. The categorization of this animal model&#39;s healing process provides an effective in vivo method for investigating novel biomaterials and drugs that target intramembranous ossification during bone tissue defect healing.

作者聚焦:用于增强生物材料和骨再生评估的箱腔皮质方法

Here, we present a protocol for creating a box-cavity defect in rat femoral diaphysis tissue. This model can assess biomaterial performance under biomechanical stress and explore mechanisms of bone regeneration related to intramembranous osteogenesis.

在大鼠股骨皮质骨中创建箱腔缺损模型

Severe bone defects or complex fractures can result in serious complications such as nonunion or insufficient bone healing. Tissue engineering, which ...

大鼠牵张成骨的高效可再生性协议

摘要

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人类血管周围干细胞用于骨再生

建立评估膜内骨化硬性稳定骨折，牵张成骨，或临界中小企业缺损愈合

小鼠牵张成骨模型

可调节刚度，外固定支架的大鼠股骨截骨和节段性骨缺损模型

在小鼠节段性股临界尺寸缺陷模型的建立接骨板稳定

一种可靠、可重复的可重复的大鼠部分股骨缺陷模型

髓内锁钉股骨截骨标准化固定用于分析正常和有缺陷的骨愈合小鼠

开发Wistar白化大鼠股骨截骨模型的协议

在大鼠股骨皮质骨中创建箱腔缺损模型

在大鼠股骨皮质骨中创建箱腔缺损模型