富血小板血浆促进骨缺损修复的实验研究

目的 探讨复合富血小板血浆(PRP)的陶瓷人工骨对管状骨骨缺损的修复作用。方法 新西兰大白兔24只，体重2．5～3．0kg，雌雄不限。随机选择一侧桡骨作实验侧，连同骨膜切除桡骨中上段1cm，造成节段性骨缺损，填入复合PRP的人工骨，另一侧为对照侧，仅填入人工骨，分别在术后第2、4、8和12周通过大体观察、X线片、组织学及计算机图像分析等手段观察两侧桡骨愈合情况。结果 术后第2周，实验侧和对照侧的新生纤维组织和骨组织均主要集中在截骨靖，实验侧新生组织略多于对照侧。第4、8周，实验侧人工骨表面及孔隙内被大量新生骨组织覆盖和填充，人工骨与宿主骨桥接紧密；对照侧的新生骨组织主要限于人工骨两端，且相对实验侧较幼稚。第12周，实验侧骨缺损完全修复，人工骨表面被皮质骨完全覆盖，对照侧仅于两侧截骨靖区域出现板层骨，人工骨表面未见连续性骨痴形成。结论 复合PRP的人工骨可用于管状骨缺损的修复，并有明显加速骨愈合的作用。

EXPERIMENTAL STUDY ON EFFECT OF PLATELET-RICH PLASMA IN REPAIR OF BONE DEFECT

Objective To study the effect of platelet rich plasma in the repair of bone defect. Methods Segmental bone defects of 1 cm were created in the mid upper part of bilateral radius of 24 New Zealand white rabbits. One side was randomly chosen as the experimental side, which was filled with artificial bone with platelet rich plasma (PRP). The other side filled with artificial bone without PRP as the control. After 2, 4, 8 and 12 weeks of implantation, the gross , radiological , histological observations , and computer graphic analysis were performed to investigate the bone healing of the defect in both sides. Results Two weeks after operation, new bone and fibrous tissue formation in both the experimental and the control sides were observed only in the areas adjacent to the cut ends of the host bone, but the amount of new tissue in the experimental side was much more than that in the control side. In the 4th and 8th weeks, the surface of the artificial bone was covered with a large amount of new bones, the artificial bone was bridged tightly with the host bone by callus in the experimental side, while new bone was limited mainly in the cut ends and was less mature in the control side. In the 12th weeks, bone defects were entirely healed in the experimental side, which were covered completely with cortical bone, while new bone formation was only observed in the ends of artificial bone and there were not continuous bone callus on the surface in the control side. Conclusion Artificial bone with PRP is effective in the repair of segmental bone defects, and PRP could improve the healing of bone defect.