低强度脉冲超声波辐照对泡沫TiC/Ti修复犬节段性骨缺损影响的研究
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The study of LIPUS stimulating the TiC/Ti Foam to restore the segmental bone defect
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    摘要:

    目的 探讨低强度脉冲超声波辐照对节段性骨缺损修复效果的影响。方法 将直径12mm长20mm泡沫TiC/Ti植入6只Beagle犬的左侧胫骨节段性骨缺损区。随机分为超声组和对照组,超声组采用低强度脉冲超声波辐照(频率1.5MHz、强度30mW/cm2、脉冲宽度200μs、脉冲周期1kHz、20min/次、1次/d),对照组为不开功率源的假辐照,术后4w、8w后分别行X线检查及骨密度测定,观察及分析材料周围骨愈合情况。结果 6只beagle犬均进入结果分析。术后4w超声组骨早期成熟度优于对照组,表现在材料周围骨痂影密度增高,骨痂影由两端向中央生长;对照组仅见骨痂区密度低,还可见部分骨痂缺如。术后8w超声组新生骨痂面积优于对照组,骨干结构相对稳定;对照组骨缺损区未闭合,在骨干两侧看到少量骨痂,愈合较差。骨密度测定结果显示,4w时超声组高于对照组,两组间存在统计学差异;8w时超声组略高于对照组,但两组间没有统计学差异。结论 通过联合应用低强度脉冲超声波辐照与人工骨材料修复可提高新骨形成速度及骨组织密度,缩短节段性骨缺损的骨愈合时间。

    Abstract:

    Objective The experiment investigates the influence of the Low-Intensity Pulsed ultrasound Stimulation to restore the segment bone defect. Methods Insert 12mm diametric 20mm long TiC/Ti Foam into the area of Beagle dogs’ left tibia with segmental bone defect. Divide the six dogs into two groups randomly, the experiment group with LIPUS (1.5MHz, ISATA30mW/cm2, pulsed width 200μs, repeating 1kHz pulsation, once/d), the contra group without LIPUS. Observe and analyse formation around the material with X-ray film and the admeasurement of the bone mineral density at 4w and 8w. Results Six Beagle dogs were included in the final analysis. At week 4, the maturation of newly formed bone under the LIPUS treatment group appeared earlier than that of the contra group, on the basis of the bone mineral density increase and bone callus growth. On the bone mineral density aspect, the experimental group’s rate is higher than the contra group; on the bone callus aspect, the experimental group grow from marginal to central, the contra group still has vacancy. At week 8, the skeletal structure stability under the LIPUS treatment group is higher than that of the contra group, on the basis of the bone callus area and the formability. Measured the bone mineral density at week 4, the experimental group is higher than the contra group(p<0.05). Conclusion Combining applying the Low-Intensity Pulsed Ultrasound Stimulation and the artificial bone material could enhance the formation rate of the bone callus and the bone mineral density, and shorten the healing time of the segmental bone defect.

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胡莹,吴琳,刘笑涵.低强度脉冲超声波辐照对泡沫TiC/Ti修复犬节段性骨缺损影响的研究[J].中国比较医学杂志,2013,23(4).

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  • 收稿日期:2013-02-01
  • 最后修改日期:2013-02-19
  • 录用日期:2013-03-25
  • 在线发布日期: 2013-05-15
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