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自体骨膜、肌腱包裹nHA/PA66复合材料替代腕舟骨的早期实验研究
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摘要
目的:初步探讨自体骨膜、肌腱包裹致密型纳米羟基磷灰石/聚酰胺66(nHA/PA66)复合材料形成复合体替代重建腕舟骨的可行性。
     方法:36只新西兰白兔,随机分为A、B、C三组,每组12只。A组:自体骨膜、肌腱包裹致密型nHA/PA66复合材料植入组;B组:自体肌腱包裹致密型nHA/PA66复合材料植入组;C组:单纯自体肌腱球植入组。完整摘除动物双侧桡侧腕舟骨后,分别将上述三种植入物放置于腕关节桡侧腕舟骨缺损处。于术后3、6、12周,取全腕关节标本行大体观察、放射学及组织学观察,并测量腕髙率,进行统计学分析。
     结果:A组植入物在3和6周时,nHA/PA66复合材料的表面即可见少量软骨母细胞;12周时,软骨母细胞数量增多,材料周缘形成类软骨组织。12周时,nHA/PA66复合材料与周缘软组织间的纤维愈着较3、6周时更为紧密。在不同时间段,均未见nHA/PA66复合材料碎裂、吸收或降解。B、C组植入物在不同时间段均未见类软骨组织在材料周缘形成,但C组腕关节标本较A、B组经大体观察和X线摄片显示腕关节高度明显丢失,塌陷明显。标本X线腕高率经统计学分析,A、B组无明显减低(P>0.05), C组有非常明显的减低(P<0.01)。
     结论:自体骨膜、肌腱包裹致密型nHA/PA66复合材料形成的复合体在腕关节腔中,其表面能够化生出类软骨组织,且具有良好的抗压强度,可以用作腕舟骨替代物。
Objective: To investigate whether the composite materials of dense nano- hydroxyapatite / polyamide 66 (nHA/PA66) wrapped by autologous periosteum and tendon can reconstructe carpal scaphoid.
     Methods: 36 New Zealand white rabbits were randomly divided into three groups, A, B and C, 12 rabbits per group. Group A: composite material of dense nHA/PA66 wrapped by autologous periosteum and tendon; Group B: composite material of dense nHA/PA66 wrapped by autologous tendon; Group C: autologous tendon ball alone. After bilateral carpal bones were completely removed, the above three materials were respectively implanted to replace radial carpal bone. 3,6,12 weeks after surgery, the whole wrist was collected for gross observation, radiological and histological examination,and carpometacarpal index whose data were statistically analyzed .
     Results: In Group A, 3 and 6 weeks after surgery, a small amount of chondroblasts were found on the surface of the composite material of nHA/PA66; 12 weeks after surgery, chondroblasts increased and transparent cartilage formed around the material. The composite materials of nHA/PA66 were combined more closely with soft tissue around by the firbers in the twelfth week than that in the third or the sixth week. During different time periods, no composite materials of nHA/PA66 were fragmentated, absorbed or degraded. In Group B and C, no transparent cartilage was found around the implants during different periods, but the gross observation and radiological examination showed that the cartilage in wrists lost obviously and the wrists collapsed significantly in Group C more that those in Group A and B.The statistical analysis of sample with carpometacarpal index,A,B group had no significantly lower(P>0.05), C group had significantly lower(P<0.01).
     Conclusion: That autologous periosteum and tendon wrapping dense nHA/PA66 cound form composite materials in the wrist joint cavity; hyaline-like cartilage could form on their surface, and the materials were so strong that they could be used to replace scaphoid bones .
引文
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