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11、 _alTeld _gH _tanleC FH ,- .8*2%,96*?96% ESSEi b Q3 _uppl):3SbeNE Aebli dH mrebs hH _chwenTe DH ,- .N3EQN):OEe N E 3 V c O _Irew path anX vertebral peXiIle sIrew in strenMtheninM lateral are on the Neft anX those in Iontrol lateral are on the riMht .Uaterials arounX sIrew path are miGture of IalIium
12、 phosphate Iement anX trabeIular bonesHwhiIh are in white.Fhere are no obvious bone XestruItion in bilateral sIrew paths. DiMure EroriZontal seItion of sIrew traIT !“# ISSN 1671-5926CN 21-1470/R www.#$% 强化侧:填入磷酸钙骨水泥再置入椎弓根螺钉。 置钉后的椎骨在37 恒温箱里放置12 h,然后测定椎弓根螺钉的最大轴向拔出力。磷酸钙 骨水泥初步凝固时强化椎弓根螺钉固定的生物力学测试: 取52岁组椎
13、 骨作为测试对象。 用同样方法在椎弓根对照侧直接置入椎弓根螺钉,强 化侧填入骨水泥后再置入椎弓根螺钉,37 恒温箱里放置15 min,测定 椎弓根螺钉初步凝固时的最大轴向拔出力。磷酸钙骨水泥强化松动椎 弓根螺钉固定的生物力学测试:取测试后的50岁组椎骨,用磷酸钙骨水 泥重新固定12 h后拔松的椎弓根螺钉,测定其两侧的最大轴向拔出力。 主要观察指标:磷酸钙骨水泥最终凝固时强化椎弓根螺钉固定的生 物力学测试结果。磷酸钙骨水泥初步凝固时强化椎弓根螺钉固定的 生物力学测试结果。磷酸钙骨水泥强化松动椎弓根螺钉固定的生物 力学测试结果。 结果:50岁组对照侧和强化侧的椎弓根螺钉最大轴向拔出力中位数 分别为
14、620 N和1 136 N, 强化侧较对照侧增加83%(8 ?9AB?E9A?E= F=A4E9!% 1Department of Obstetrics and Gynecology Peing nion _ospital eiaing 100730Chinab 2 College of Physicians SurgeonsColumbia nicersity Ned Yor10027-6902 SA ;?9ABGCDE=4 HC= FI$J88K6L 98 KMLN94K= 9= L?K NK5EL?;*:=; ?3433= 2A ,=7 ?2 kn the mide1990shrost
15、l1m contended that gh determines bone structure and gdhich made bone strength adaptable to dor load. Responding to nerce signals seleton muscles contract acticely so as to produce bone stress (load) dhich finally affects decelopmentgrodthmaturation and aging of bone by adausting the process of model
16、ing and remodeling and accordinglyhace associated dith the change of bone mass. Also seletal muscle and bone hace impact on action formation and termination by aoint mocement.In addition seleton muscles effect on occurrencedecelopment and oute come of osteoporosis adausted by and combined dith nutrition and endocrinological status as dell. one morphology dill be changed under eiternal load dhich is called bone strain. Simultaneously a ind of poder called 3BB“#* CB “.*/CD“E CE *F“ /“GH*$CE CB IJ.#G“ BC/#“ 0E& -CE“ I0! !“#