摘要
目的探讨将聚乙烯内衬以骨水泥固定于金属髋臼并矫正髋臼过大的外展角对内衬内表面应变的影响。方法对3具尸体骨盆6个髋关节髋臼行生物型髋臼固定,髋臼假体右侧45°外展,左侧65°外展,前倾均为15°,放置聚乙烯内衬后,在SANS生物力学机上施加一组最大值为500 N的垂直载荷,通过电阻应变片测定内衬应变值,再把左侧髋臼的内衬取出,以骨水泥固定外径小4 mm的聚乙烯内衬于外展45°,施加同样的垂直载荷,再次测定内衬应变值。结果随着载荷增加,外展65°时的内衬应变明显增加,其上升速度较快,在3个标本均高于右髋外展45°内衬的应变值;骨水泥固定聚乙烯内衬于外展45°后,其应变值接近于正常45°外展的内衬应变值。结论髋臼外展角过大导致内衬应变增加,骨水泥固定内衬矫正外展角可减少内衬的应变。
Objective To evaluate the influence on liner strain at inner surface by cementing liner into stable shell with correct abduction angle. Methods Three cadaver pelvis （ 6 hips） underwent total hip replacement with two different orientations at acetabula, which were 45 degree abduction on the fight side, 65 degree abduction on the left and 15 degree anteversion on the both sides. Increasing vertical stress up to 500 N was loaded on the fixed pelvis and liner＇s strain distribution was measured with a strain gauge. After that, the liners on left side were exchanged with smaller ones and the latter were cemented into the shell at 45 degree abduction angle. The liner＇s strain was measured in the new situation. Results Accompanying with vertical stress loading, liner strain increased more rapidly and higher at the left hips （65 degree abduction） than the right hips （45 degree abduction）. As smaller liner was cemented into left acetabular shells with 45 degree abduction, the liner strain was close to the results of the fight side with modular liner at 45 degree abduction. Conclusion Greater abduction angle may result in higher liner strain. To revise a well -fixed acetabular shell with unsatisfied abduction angle, cementing a new liner into the shell with a correct abduction angle can reduce the liner strain.
出处
《中华关节外科杂志（电子版）》
CAS
2013年第5期76-79,共4页
Chinese Journal of Joint Surgery(Electronic Edition)
基金
广东省医学科学研究基金(A2013255)
关键词
髋关节
再手术
内衬
生物力学
Hip joint
Reoperation
Liner
Biomechanics
