目的利用有限元方法分析骶髂关节周围各韧带对骶髂关节稳定性的影响。方法建立正常腰椎-骨盆-股骨有限元模型,在该正常模型基础上分别去除双侧骶髂关节各韧带,建立无髂腰韧带模型、无骶髂前韧带模型、无骶髂后韧带模型、无骶结节韧带模...目的利用有限元方法分析骶髂关节周围各韧带对骶髂关节稳定性的影响。方法建立正常腰椎-骨盆-股骨有限元模型,在该正常模型基础上分别去除双侧骶髂关节各韧带,建立无髂腰韧带模型、无骶髂前韧带模型、无骶髂后韧带模型、无骶结节韧带模型、无骶棘韧带模型和无骶髂骨间韧带模型。在各模型上分别模拟脊柱的生理运动,分析左右骶髂关节活动度(range of motion,ROM)和各关节面的平均应力,并与正常模型进行比较。结果相比正常骶髂关节模型,无骶结节韧带模型、无骶棘韧带模型和无骶髂后韧带模型的左右两侧骶髂关节ROM均无明显差异,而无骨间韧带模型除在脊柱右旋转情况下左侧骶髂关节ROM和后伸情况下右侧骶髂关节ROM无明显差异外,在其他脊柱生理活动下左右两侧骶髂关节ROM均显著增大。无骶髂骨间韧带模型左右两侧骶髂关节在脊柱生理活动下关节面的平均应力均明显降低。结论在所有骶髂关节周围韧带中,骶髂骨间韧带对骶髂关节的稳定性影响最大。研究结果有利于探讨骶髂关节错位的发生机制,为临床骶髂关节错位的治疗提供一定理论依据。展开更多
By doping with Mg atoms,the bandgap of Mg-doped NiO thin films can be adjusted larger.By using NiO and MgO as sputtering targets,Mg-doped NiO thin films were deposited using radio-frequency magnetron co-sputtering met...By doping with Mg atoms,the bandgap of Mg-doped NiO thin films can be adjusted larger.By using NiO and MgO as sputtering targets,Mg-doped NiO thin films were deposited using radio-frequency magnetron co-sputtering method in pure argon and pure oxygen gas,respectively.The crystal structure,morphological characteristics,composition and optical properties of the obtained films were compared by X-ray diffraction(XRD),scanning electron microscope(SEM),energy dispersive spectrometer(EDS)and ultraviolet(UV)-visible spectrophotometer.The properties of the thin films deposited in different sputtering gases are quite different.For the films deposited in pure argon gas,it is a polycrystalline thin film with(200)preferred orientation,while the film deposited in pure oxygen has no preferred orientation.The grain size,molar ratio of Mg to Ni atoms and optical bandgap are larger for the films deposited in pure argon gas than those deposited in oxygen gas.展开更多
文摘目的利用有限元方法分析骶髂关节周围各韧带对骶髂关节稳定性的影响。方法建立正常腰椎-骨盆-股骨有限元模型,在该正常模型基础上分别去除双侧骶髂关节各韧带,建立无髂腰韧带模型、无骶髂前韧带模型、无骶髂后韧带模型、无骶结节韧带模型、无骶棘韧带模型和无骶髂骨间韧带模型。在各模型上分别模拟脊柱的生理运动,分析左右骶髂关节活动度(range of motion,ROM)和各关节面的平均应力,并与正常模型进行比较。结果相比正常骶髂关节模型,无骶结节韧带模型、无骶棘韧带模型和无骶髂后韧带模型的左右两侧骶髂关节ROM均无明显差异,而无骨间韧带模型除在脊柱右旋转情况下左侧骶髂关节ROM和后伸情况下右侧骶髂关节ROM无明显差异外,在其他脊柱生理活动下左右两侧骶髂关节ROM均显著增大。无骶髂骨间韧带模型左右两侧骶髂关节在脊柱生理活动下关节面的平均应力均明显降低。结论在所有骶髂关节周围韧带中,骶髂骨间韧带对骶髂关节的稳定性影响最大。研究结果有利于探讨骶髂关节错位的发生机制,为临床骶髂关节错位的治疗提供一定理论依据。
基金supported by the Jilin Provincial Scientific and Technological Development Program(No.20220101036JC)。
文摘By doping with Mg atoms,the bandgap of Mg-doped NiO thin films can be adjusted larger.By using NiO and MgO as sputtering targets,Mg-doped NiO thin films were deposited using radio-frequency magnetron co-sputtering method in pure argon and pure oxygen gas,respectively.The crystal structure,morphological characteristics,composition and optical properties of the obtained films were compared by X-ray diffraction(XRD),scanning electron microscope(SEM),energy dispersive spectrometer(EDS)and ultraviolet(UV)-visible spectrophotometer.The properties of the thin films deposited in different sputtering gases are quite different.For the films deposited in pure argon gas,it is a polycrystalline thin film with(200)preferred orientation,while the film deposited in pure oxygen has no preferred orientation.The grain size,molar ratio of Mg to Ni atoms and optical bandgap are larger for the films deposited in pure argon gas than those deposited in oxygen gas.
