CAJ | 학술논문

人们针对髋臼翻修假体进行了多种设计以提高它的使用寿命.关于经常用于翻修手术中的半球形超大髋臼假体的研究已有很多,而一种新型三翼翻修假体在临床使用中取得了令人满意的效果.对比分析上述两种假体,并对带翼假体的设计做出适当评价.建立半球形髋臼假体和三翼髋臼假体的三维有限元模型,应用有限元分析公式计算在缺损髋臼翻修后,不同翻修假体在正常步态周期内的应力变化规律.结果显示,在不同关节力的作用下半球形髋臼假体与三翼假体的应力分布规律基本相同,只是后者在三翼与球壳连接的翼跟部存在应力集中带.而翼间夹角为15°的三翼髋臼假体所受应力要明显小于翼间夹角30°的三翼髋臼假体和半球形髋臼假体(P<0.05).结果提示,带翼髋臼假体与半球形假体置入后所受的应力水平无明显差别,而使用翼间夹角较小的带翼假体可明显减小假体各部所受的应力,从而可提高带翼假体的稳定性.
인문침대관구번수가체진행료다충설계이제고타적사용수명.관우경상용우번수수술중적반구형초대관구가체적연구이유흔다,이일충신형삼익번수가체재림상사용중취득료령인만의적효과.대비분석상술량충가체,병대대익가체적설계주출괄당평개.건립반구형관구가체화삼익관구가체적삼유유한원모형,응용유한원분석공식계산재결손관구번수후,불동번수가체재정상보태주기내적응력변화규률.결과현시,재불동관절력적작용하반구형관구가체여삼익가체적응력분포규률기본상동,지시후자재삼익여구각련접적익근부존재응력집중대.이익간협각위15°적삼익관구가체소수응력요명현소우익간협각30°적삼익관구가체화반구형관구가체(P<0.05).결과제시,대익관구가체여반구형가체치입후소수적응력수평무명현차별,이사용익간협각교소적대익가체가명현감소가체각부소수적응력,종이가제고대익가체적은정성.
Alternative designs have been explored in an attempt to improve the longevity of acetabular prostheses in revision surgery. Many studies had been designed to test the result of the extra-large uncemented hemispherical acetabular components used for acetabular revision in the presence of bone loss. A clinical study of a new acetabular component consisting of a porous metal shell with three wings and an all-polyethylene liner had attained a satisfying result. The purpose of this study was to evaluate the new acetabular component by comparison with the hemispherical acetabular component. The finite-element models of the two acetabular components and the acetabulum in the presence of bone loss were established to calculate the interface stresses during a normal gait cycle with use of the finite-element formulations. Results of the finite-element analysis demonstrated that stress and strain of the two acetabular components had the same direction of change, but the new component had higher stress at the root of wings. In the study, the result indicated reduced contact stresses with a reduced abduction angle of wings. The stress was lower in the new acetabular component of 15° angle of wings compared with the new acetabularcomponent of 30°of wings and hemispherical acetabular component (P < 0.05). The stress of acetabular component with wings showed no remarkable difference by comparison with the extra-large uncemented hemispherical acetabular component. Reducing abduction angle of wings seemed to be a viable means of reducing the stress of the acetabular component while improving its stability.