目的:比较小夹板外固定对3种类型Colles骨折的固定效果。方法:回顾性分析62例采用手法复位小夹板外固定治疗的Colles骨折患者的病例资料;按AO分型标准,A型9例(A型组)、B型28例(B型组)、C型25例(C型组)。所有患者均按照《中医骨伤科常见...目的:比较小夹板外固定对3种类型Colles骨折的固定效果。方法:回顾性分析62例采用手法复位小夹板外固定治疗的Colles骨折患者的病例资料;按AO分型标准,A型9例(A型组)、B型28例(B型组)、C型25例(C型组)。所有患者均按照《中医骨伤科常见病诊疗指南》中桡骨远端骨折的操作规范进行手法复位小夹板外固定。根据X线片评估骨折愈合情况,测量桡骨高度、掌倾角及尺偏角,并采用Green and O’Brien腕关节评分标准评定腕关节功能。比较治疗后6周时3组患者的桡骨高度、掌倾角、尺偏角的恢复情况及治疗后12个月时的腕关节功能。结果:所有患者均未发生骨折再移位。所有骨折均获骨性愈合;3组患者的骨折愈合时间比较,差异无统计学意义[(5.9±2.9)周,(6.1±2.4)周,(6.1±1.9)周,F=3.201,P=0.089]。治疗后6周时,3组患者的掌倾角增加值比较,差异无统计学意义(12.64°±1.53°,14.08°±3.09°,14.03°±2.79°,F=2.166,P=0.121);3组患者的桡骨高度增加值比较,差异有统计学意义[(0.97±0.17)cm,(0.83±0.19)cm,(0.63±0.16)cm,F=9.473,P=0.021],A型组桡骨高度增加值大于B型组和C型组(P=0.030;P=0.002),B型组大于C型组(P=0.001);3组患者的尺偏角增加值比较,差异有统计学意义(15.60°±1.75°,16.57°±1.86°,13.76°±1.94°,F=11.483,P=0.001),A型组和B型组尺偏角增加值均大于C型组(P=0.001;P=0.029),A型组和B型组比较,差异无统计学意义(P=0.078)。治疗后12个月时3组患者的Green and O’Brien评分比较,差异有统计学意义[(88.56±2.19)分,(81.79±4.74)分,(69.68±6.01)分,F=13.619,P=0.000],A型组的评分高于B型组和C型组(P=0.011;P=0.000),B型组评分高于C型组(P=0.001)。结论:对于A、B型Colles骨折,小夹板外固定可有效维持复位后骨折端的稳定,有利于关节功能恢复;但对于C型Colles骨折,小夹板外固定效果较差。展开更多
Zn-Al-Cu-TiB2（ZA27-TiB2） in situ composites were fabricated via reactions between molten aluminum and mixed halide salts（K2TiF6 and KBF4） at temperature of 875 °C. The microstructure, mechanical properties an...Zn-Al-Cu-TiB2（ZA27-TiB2） in situ composites were fabricated via reactions between molten aluminum and mixed halide salts（K2TiF6 and KBF4） at temperature of 875 °C. The microstructure, mechanical properties and wear behavior of the composites were investigated. Microstructure analysis shows that fine and clean TiB2 particles distribute uniformly through the matrix. The mechanical properties of the composites increase with the increase in TiB2 content. As TiB2 content increases to 5%（mass fraction）, an improvement of HB 18 in hardness and 49 MPa in ultimate tensile strength（UTS） is achieved. The overall results reveal that the composites possess low friction coefficients and the wear rate is reduced from 5.9×10-3 to 1.3×10-3 mm3/m after incorporating 5% TiB2. Friction coefficient and worn surface analysis indicate that there is a change in the wear mechanism in the initial stage of wear test after introducing in situ TiB2 particles into the matrix.展开更多
文摘目的:比较小夹板外固定对3种类型Colles骨折的固定效果。方法:回顾性分析62例采用手法复位小夹板外固定治疗的Colles骨折患者的病例资料;按AO分型标准,A型9例(A型组)、B型28例(B型组)、C型25例(C型组)。所有患者均按照《中医骨伤科常见病诊疗指南》中桡骨远端骨折的操作规范进行手法复位小夹板外固定。根据X线片评估骨折愈合情况,测量桡骨高度、掌倾角及尺偏角,并采用Green and O’Brien腕关节评分标准评定腕关节功能。比较治疗后6周时3组患者的桡骨高度、掌倾角、尺偏角的恢复情况及治疗后12个月时的腕关节功能。结果:所有患者均未发生骨折再移位。所有骨折均获骨性愈合;3组患者的骨折愈合时间比较,差异无统计学意义[(5.9±2.9)周,(6.1±2.4)周,(6.1±1.9)周,F=3.201,P=0.089]。治疗后6周时,3组患者的掌倾角增加值比较,差异无统计学意义(12.64°±1.53°,14.08°±3.09°,14.03°±2.79°,F=2.166,P=0.121);3组患者的桡骨高度增加值比较,差异有统计学意义[(0.97±0.17)cm,(0.83±0.19)cm,(0.63±0.16)cm,F=9.473,P=0.021],A型组桡骨高度增加值大于B型组和C型组(P=0.030;P=0.002),B型组大于C型组(P=0.001);3组患者的尺偏角增加值比较,差异有统计学意义(15.60°±1.75°,16.57°±1.86°,13.76°±1.94°,F=11.483,P=0.001),A型组和B型组尺偏角增加值均大于C型组(P=0.001;P=0.029),A型组和B型组比较,差异无统计学意义(P=0.078)。治疗后12个月时3组患者的Green and O’Brien评分比较,差异有统计学意义[(88.56±2.19)分,(81.79±4.74)分,(69.68±6.01)分,F=13.619,P=0.000],A型组的评分高于B型组和C型组(P=0.011;P=0.000),B型组评分高于C型组(P=0.001)。结论:对于A、B型Colles骨折,小夹板外固定可有效维持复位后骨折端的稳定,有利于关节功能恢复;但对于C型Colles骨折,小夹板外固定效果较差。
基金Projects(51071035,51274054,51375070)supported by the National Natural Science Foundation of ChinaProject(313011)supported by the Key Project of Ministry of Education of China
文摘Zn-Al-Cu-TiB2（ZA27-TiB2） in situ composites were fabricated via reactions between molten aluminum and mixed halide salts（K2TiF6 and KBF4） at temperature of 875 °C. The microstructure, mechanical properties and wear behavior of the composites were investigated. Microstructure analysis shows that fine and clean TiB2 particles distribute uniformly through the matrix. The mechanical properties of the composites increase with the increase in TiB2 content. As TiB2 content increases to 5%（mass fraction）, an improvement of HB 18 in hardness and 49 MPa in ultimate tensile strength（UTS） is achieved. The overall results reveal that the composites possess low friction coefficients and the wear rate is reduced from 5.9×10-3 to 1.3×10-3 mm3/m after incorporating 5% TiB2. Friction coefficient and worn surface analysis indicate that there is a change in the wear mechanism in the initial stage of wear test after introducing in situ TiB2 particles into the matrix.
