目的探讨测量截骨法与间隙平衡法在老年全膝关节置换术中的效果。方法选取2017年10月至2018年9月在内蒙古自治区赤峰市医院行全膝关节置换术的患者88例,根据随机数字表法分为观察组和对照组各44例,在全膝关节置换术中对照组采用测量截骨...目的探讨测量截骨法与间隙平衡法在老年全膝关节置换术中的效果。方法选取2017年10月至2018年9月在内蒙古自治区赤峰市医院行全膝关节置换术的患者88例,根据随机数字表法分为观察组和对照组各44例,在全膝关节置换术中对照组采用测量截骨法,观察组采用间隙平衡法进行治疗。观察指标包括纽约特种外科医院膝关节评分(hospital for special surgery knee score,HSS)、视觉模拟评分(visual analogue scale,VAS)、关节活动度(rangeofmotion,ROM)评分、美国膝关节协会评分(American knee society knee score,AKSS)、36项健康简表。术后1年进行患者满意度回访。结果观察组总有效率、HSS评分、ROM评分、AKSS评分高于对照组,VAS评分低于对照组,差异有显著性(P<0.05);两组术前生活质量差异无显著性,差异无显著性(P>0.05);术后生活质量评分显著高于治疗前,组间比较,观察组生活质量评分总分高于对照组,差异有显著性(P<0.05);观察组满意度(95.45%)高于对照组,差异有显著性(P<0.05)。结论在老年全膝关节置换术中,间隙平衡法与测量截骨法作为两种不同截骨技术均有各自的优势,但间隙平衡法临床疗效更为突出,其优势在于股骨假体安放更为精确、创伤更小,患者生活质量更高。展开更多
We focus on the hysteretic characteristics of the varying compliance(VC) principal resonance in a ball bearing. The branches of the periodic VC response are traced by the harmonic balance method and the alternating fr...We focus on the hysteretic characteristics of the varying compliance(VC) principal resonance in a ball bearing. The branches of the periodic VC response are traced by the harmonic balance method and the alternating frequency/time domain technique(HB-AFT) embedding Arc-length continuation, and the stability of these solutions is investigated by using Floquet theory. We find that the resonant response displays a swallow-tail structure due to the coupling nonlinearities between the Hertzian contact and the bearing clearance, which differs from the soft hysteresis of the non-loss Hertzian contact resonances. Furthermore, we find that period-1 VC branch cannot completely characterize the response of the system for a large bearing clearance, because multiple instability regions may occur from the cyclic fold, the secondary Hopf bifurcations, supercritical and subcritical period doubling bifurcations, in which case co-existences of period-1, period-2, and even quasi-periodic VC motions emerge in the hysteretic resonant range.展开更多
文摘目的探讨测量截骨法与间隙平衡法在老年全膝关节置换术中的效果。方法选取2017年10月至2018年9月在内蒙古自治区赤峰市医院行全膝关节置换术的患者88例,根据随机数字表法分为观察组和对照组各44例,在全膝关节置换术中对照组采用测量截骨法,观察组采用间隙平衡法进行治疗。观察指标包括纽约特种外科医院膝关节评分(hospital for special surgery knee score,HSS)、视觉模拟评分(visual analogue scale,VAS)、关节活动度(rangeofmotion,ROM)评分、美国膝关节协会评分(American knee society knee score,AKSS)、36项健康简表。术后1年进行患者满意度回访。结果观察组总有效率、HSS评分、ROM评分、AKSS评分高于对照组,VAS评分低于对照组,差异有显著性(P<0.05);两组术前生活质量差异无显著性,差异无显著性(P>0.05);术后生活质量评分显著高于治疗前,组间比较,观察组生活质量评分总分高于对照组,差异有显著性(P<0.05);观察组满意度(95.45%)高于对照组,差异有显著性(P<0.05)。结论在老年全膝关节置换术中,间隙平衡法与测量截骨法作为两种不同截骨技术均有各自的优势,但间隙平衡法临床疗效更为突出,其优势在于股骨假体安放更为精确、创伤更小,患者生活质量更高。
基金supported by the National Basic Research Program of China("973"Project)(Grant No.2015CB057400)the China Postdoctoral Science Foundation(Grant No.2013M541360)the National Natural Science Foundation of China(Grant Nos.10632040 and 11302058)
文摘We focus on the hysteretic characteristics of the varying compliance(VC) principal resonance in a ball bearing. The branches of the periodic VC response are traced by the harmonic balance method and the alternating frequency/time domain technique(HB-AFT) embedding Arc-length continuation, and the stability of these solutions is investigated by using Floquet theory. We find that the resonant response displays a swallow-tail structure due to the coupling nonlinearities between the Hertzian contact and the bearing clearance, which differs from the soft hysteresis of the non-loss Hertzian contact resonances. Furthermore, we find that period-1 VC branch cannot completely characterize the response of the system for a large bearing clearance, because multiple instability regions may occur from the cyclic fold, the secondary Hopf bifurcations, supercritical and subcritical period doubling bifurcations, in which case co-existences of period-1, period-2, and even quasi-periodic VC motions emerge in the hysteretic resonant range.
