目的探讨高能震波对骨质疏松骨的结构及力学性能影响。方法40只雌性新西兰兔去势,建立骨质疏松动物模型。应用高能震波处理一侧股骨近端,能量密度0.26 mJ/mm2,频率60次/min,冲击量为2000次;另一侧作为对照。分别于术后4、8、12、24周,行...目的探讨高能震波对骨质疏松骨的结构及力学性能影响。方法40只雌性新西兰兔去势,建立骨质疏松动物模型。应用高能震波处理一侧股骨近端,能量密度0.26 mJ/mm2,频率60次/min,冲击量为2000次;另一侧作为对照。分别于术后4、8、12、24周,行micro-CT、骨计量学及生物力学检测。结果micro-CT分析显示治疗组表观骨密度(Density of TV)、相对骨体积(BV/TV)、骨小梁厚度(Tb.Th)、骨小梁数目(Tb.N)均明显高于对照组,而骨表面积体积比(BS/BV)、骨小梁间隙(Tb.Sp)、骨小梁结构模型指数(SMI)较对照组少(P〈0.01)。骨组织形态计量学检测显示治疗组骨小梁体积和骨小梁厚度增加,骨小梁间距减少,骨矿化沉积率明显降低(P〈0.05),骨小梁数目变化不明显(P〉0.05)。股骨粗隆最大压缩载荷治疗组为186.13±15.64,对照组为121.83±17.82,治疗组明显高于对照组(P〈0.05)。结论高能震波能促进骨质疏松骨形成,改善骨小梁的三维结构,增加骨质密度,改善力学性能,可被用来局部治疗骨质疏松及骨质疏松性骨折,预防再次骨折发生。展开更多
Objective To investigate the histomorphometric features of the necrotic femoral head of rabbits induced by methylprednisolone combined with lipopolysaccharide. Methods Thirty-two mole adult New Zealand white rabbits w...Objective To investigate the histomorphometric features of the necrotic femoral head of rabbits induced by methylprednisolone combined with lipopolysaccharide. Methods Thirty-two mole adult New Zealand white rabbits were used. Among them, 16 were injected with lipopolysaccharide and methylprednisolone ( osteonecrosis group) , and another 16 were sham-injected with saline ( control group). Magnetic resonance (MR) imaging was taken for femoral heads of the rabbits in both groups at the end of 2, 4 and 6 weeks after the injection. All the rabbits were then killed 6 weeks later. The femoral heads of the rabbits were collected and processed for histological and histomorphometric analysis. Results Femoral head necrosis occurred in 14 rabbits of the osteonecrosis group which were confirmed by histological evaluation and MR imaging. Osteonecrotic femoral heads, compared to controls, were characterized by lower values of bone volume/tissue volume ( P 〈 0. 01 ), tabecular thichness ( P 〈 0. 01 ) , osteoid surface/bone surface ( P 〈 0. 05 ), mineralizing apposition rate ( P 〈 0 05 ), and bone formation rate/bone surface ( P 〈0. 05 ). However, tabecular separation and eroded surface/bone surface were higher in osteonecrotic femoral heads than in controls ( P 〈 0. 01 ). Trabecular number and osteoclast surface/ bone surface did not differ significantly. Conclusion The results demonstrated that osteoporosis was apparent in osteonecrotic femoral heads induced by methylprednisolone and lipopolysaccharide, due mainly to trabecular thinning rather than reduction of trabecular number. This might be due to reduced bone formation combined with increased bone resorption.展开更多
文摘目的探讨高能震波对骨质疏松骨的结构及力学性能影响。方法40只雌性新西兰兔去势,建立骨质疏松动物模型。应用高能震波处理一侧股骨近端,能量密度0.26 mJ/mm2,频率60次/min,冲击量为2000次;另一侧作为对照。分别于术后4、8、12、24周,行micro-CT、骨计量学及生物力学检测。结果micro-CT分析显示治疗组表观骨密度(Density of TV)、相对骨体积(BV/TV)、骨小梁厚度(Tb.Th)、骨小梁数目(Tb.N)均明显高于对照组,而骨表面积体积比(BS/BV)、骨小梁间隙(Tb.Sp)、骨小梁结构模型指数(SMI)较对照组少(P〈0.01)。骨组织形态计量学检测显示治疗组骨小梁体积和骨小梁厚度增加,骨小梁间距减少,骨矿化沉积率明显降低(P〈0.05),骨小梁数目变化不明显(P〉0.05)。股骨粗隆最大压缩载荷治疗组为186.13±15.64,对照组为121.83±17.82,治疗组明显高于对照组(P〈0.05)。结论高能震波能促进骨质疏松骨形成,改善骨小梁的三维结构,增加骨质密度,改善力学性能,可被用来局部治疗骨质疏松及骨质疏松性骨折,预防再次骨折发生。
基金Supported by National Nature Science Foundation of China (30571898)
文摘Objective To investigate the histomorphometric features of the necrotic femoral head of rabbits induced by methylprednisolone combined with lipopolysaccharide. Methods Thirty-two mole adult New Zealand white rabbits were used. Among them, 16 were injected with lipopolysaccharide and methylprednisolone ( osteonecrosis group) , and another 16 were sham-injected with saline ( control group). Magnetic resonance (MR) imaging was taken for femoral heads of the rabbits in both groups at the end of 2, 4 and 6 weeks after the injection. All the rabbits were then killed 6 weeks later. The femoral heads of the rabbits were collected and processed for histological and histomorphometric analysis. Results Femoral head necrosis occurred in 14 rabbits of the osteonecrosis group which were confirmed by histological evaluation and MR imaging. Osteonecrotic femoral heads, compared to controls, were characterized by lower values of bone volume/tissue volume ( P 〈 0. 01 ), tabecular thichness ( P 〈 0. 01 ) , osteoid surface/bone surface ( P 〈 0. 05 ), mineralizing apposition rate ( P 〈 0 05 ), and bone formation rate/bone surface ( P 〈0. 05 ). However, tabecular separation and eroded surface/bone surface were higher in osteonecrotic femoral heads than in controls ( P 〈 0. 01 ). Trabecular number and osteoclast surface/ bone surface did not differ significantly. Conclusion The results demonstrated that osteoporosis was apparent in osteonecrotic femoral heads induced by methylprednisolone and lipopolysaccharide, due mainly to trabecular thinning rather than reduction of trabecular number. This might be due to reduced bone formation combined with increased bone resorption.