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不同强度脉冲电磁场对去势大鼠股骨骨密度、骨钙含量和生物力学性能的影响

Effect of Pulsed Electromagnetic Fields of Different Magnetic Intensity on Bone Mineral Density, Bone Calcium Content and Biomechanical Properties of Femur in Ovariectomized Rats

【作者】 肖登

【导师】 何成奇;

【作者基本信息】 四川大学 , 康复医学与理疗学, 2006, 硕士

【摘要】 目的:建立去势大鼠骨质疏松模型,通过不同强度低频脉冲电磁场的干预,测定各组大鼠的骨密度、骨钙含量和骨生物力学指标,初步确定治疗骨质疏松的最适治疗强度。 材料与方法:按随机分组原则用密闭信封法将雌性3月龄SD大鼠50只分为5组:SHAM对照组10只、OVX对照组10只、OVXⅠ组10只、OVXⅡ组10只、OVXⅢ组10只。除SHAM对照组以外,对所有动物按文献方法去势造模。OVXⅠ组、OVXⅡ组和OVXⅢ组三组大鼠每天在频率为8Hz,强度分别为0.77mT、3.82mT和9.87mT的磁场环境中照射40min,共30天。SHAM对照组和OVX对照组不干预。各组动物均在满30天后股动脉放血处死,取血清标本送检血清雌二醇水平,取左侧股骨作骨密度和骨钙含量测定,右侧股骨作生物力学性能(最大载荷、最大位移、最大能量吸收、最大应力、最大应变和弹性模量)的测定。 结果:①SHAM对照组大鼠血清雌二醇水平显著高于其它四组大鼠(P<0.05或P<0.01),除OVXⅡ的血清雌二醇水平显著高于OVXⅢ外(P<0.05),OVX和OVXⅠ组大鼠的血清雌二醇水平之间的差异无显著性(P>0.05);②OVX对照组大鼠的股骨骨密度显著低于其它四组大鼠(P<0.05或P<0.01),但SHAM对照组、OVXⅠ组、OVXⅡ组及OVX

【Abstract】 Objective: The purpose of this study was to observe the effect of PEMFs of different intensity on bone mineral density, bone calcium content and biomechanical properties of femur in ovariectomized rats, so as to find out the intensity for the best therapeutic efficacy.Materials and Methods: Fifty female SD rats were randomly divided into five groups: (1) sham-operated control (no PEMFs treatment), (2) ovariectomized control (no PEMFs treatment), (3) ovariectomized I (PEMFs treatment at 8HZ frequency with 0.77mT intensity, 40min daily for 30 days), (4) ovariectomized II (PEMFs treatment at 8HZ frequency with 3.82mT intensity, 40min daily 30 days), and (5) ovariectomizedIII(PEMFs treatment at 8HZ frequency with 9.87mT intensity, 40min daily 30 days). Except for 10 rats of the sham-operated control group, a standardized ovariectomy was used in every rat. Estradiol (E2) of serum, bone mineral density (BMD), boen calcium contents and biomechanical properties (peak load, maximum displacement, maximum energy absorption, maximum stress, maximum strain and modulus of elasticity) of femur were assessed at 30 days after PEMFs treatment. Result: ① The E2 values of the sham-operated control group were

  • 【网络出版投稿人】 四川大学
  • 【网络出版年期】2007年 03期
  • 【分类号】R580
  • 【下载频次】205
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