Effects of particle size and porosity on in vivo remodeling of settable allograft bone/polymer composites.

Effects of particle size and porosity on in vivo remodeling of settable allograft bone/polymer composites.
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DOI:
10.1002/jbm.b.33349
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发表时间:
2015-11
影响因子:
3.4
通讯作者:
Guelcher, Scott A.
Guelcher, Scott A.
中科院分区:
工程技术3区
文献类型:
--
作者:
Prieto, Edna M.;Talley, Anne D.;Gould, Nicholas R.;Zienkiewicz, Katarzyna J.;Drapeau, Susan J.;Kalpakci, Kerem N.;Guelcher, Scott A.

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已确立的治疗骨空隙的临床方法包括植入自体移植物或同种异体骨、陶瓷和其他骨空隙填充物(BVF)。由赖氨酸衍生的聚氨酯和同种异体骨制备的复合材料可以作为反应性液体注射,并设置为产生具有与骨小梁相当的机械强度的BVF。在这项研究中,我们研究了孔隙率,同种异体移植物颗粒大小,和基质矿化重塑的可注射和可设置的同种异体移植物/聚合物复合材料在兔股骨髁塞缺损模型的影响。加入小颗粒(<105 μm)的低粘度(LV)和高粘度(HV)移植物在12周时仅部分愈合,加入10%脱矿骨基质并不能促进愈合。相比之下,具有大(105 - 500 μm)同种异体移植物颗粒的复合移植物在植入后12周愈合,如径向μCT和组织形态学分析所证明。这项研究强调了颗粒大小和表面连接作为调节复合骨支架重塑的影响参数。
Established clinical approaches to treat bone voids include the implantation of autograft or allograft bone, ceramics, and other bone void fillers (BVFs). Composites prepared from lysine-derived polyurethanes and allograft bone can be injected as a reactive liquid and set to yield BVFs with mechanical strength comparable to trabecular bone. In this study, we investigated the effects of porosity, allograft particle size, and matrix mineralization on remodeling of injectable and settable allograft/polymer composites in a rabbit femoral condyle plug defect model. Both low viscosity (LV) and high viscosity (HV) grafts incorporating small (<105 μm) particles only partially healed at 12 weeks, and the addition of 10% demineralized bone matrix did not enhance healing. In contrast, composite grafts with large (105 – 500 μm) allograft particles healed at 12 weeks post-implantation, as evidenced by radial μCT and histomorphometric analysis. This study highlights particle size and surface connectivity as influential parameters regulating the remodeling of composite bone scaffolds.
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