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DESIGN OF CEMENTLESS FEMORAL PROSTHESES ADAPTIVE TO SECONDARY

适应二级的非骨水泥股骨假体设计

基本信息

批准号：
03670700
负责人：
IMURA Shinichi
金额：
$ 0.51万
依托单位：
FUKUI MEDICAL SCHOOL
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

Analyzing the anatomical features of the hip joint in 85 hips of 55 patients with osteoarthritic hip and 90 hips of 60 subjects with normal hip using three-dimensional CT images,we found that 9 different stem designs varying in width and proximal radius were required to accommodate the hips with secondary osteoarthritis.In normal hips,the proportionality of the anatomical features of the proximal femoral canal to the femoral length was observed.Thus,we manufactured prototype stems for femoral neck fracture and aseptic necrosis of the femoral head which proximal radius,isthmus position,off-set value and width would increase with the stem size,but the ratios of the increase were different.By micromotion measurements of the prototype stems for femoral neck fracture and aseptic necrosis of the femoral head,Omniflex stem,Omniflex J-stem (Osteonics,Allendale,New Jersey) and AML stem (DePuy,Warsaw,Indiana), under the axial cyclic loading of 2000 N,maximum average of micromotion of the stems w … More ere each 43.1mum,54.7mum,62.0mum and 56.2mum,that were all proximal micromotions in superior-inferior direction.Under the rotational loading of 20 Nm,maximum average of micromotions were each 38.0mum,48.0mum,55.2mum and 67.5 mum,that were all proximal micromotions in anterior-posterior direction.The proximal medial compression strains of the femur were each 18.6%,23.6%,25.9% and 44.6% of those of the intact femur under the 2000N axial loading.By three-dimensional templating of femoral prostheses using computer simulation,canal filling ratios(ratio of the cross-section of the stem within the canal area) in proximal of the prototype stem designed for secondary osteoarthritis of the hip,Omniflex stem,Omniflex J-stem and AML stem were each 61.2%,59.8%,56.5% and 53.8%,and rasp ratios(ratio of the rasped cortex within the cortex area) in proximal of those were 1.10%,1.69%,1.30% and 5.17 %. Canal filling ratios in isthmus level of those stems were each 75.8%,68.1 %,68.6% and 74.1%,and rasp ratios in isthmus level were each 0.69%,0.68%,0.70% and 2.25%.Therefore, our prototype stems designed using three-dimensional CT images had smallest micromotion,highest canal filling ratio and lowest rasp ratio,so obtained satisfied primaly fixation and compatibility to the femoral canal. Less

通过对55例骨性关节炎患者的85个髋关节和60例正常人的90个髋关节的三维CT图像解剖特征的分析，发现需要9种不同的柄设计来适应继发性骨关节炎的髋关节。在正常髋关节中，股骨近端管的解剖特征与股骨长度的比例观察到。因此，我们制作了股骨颈骨折和股骨头无菌性坏死的原型柄，其近端半径、峡部位置、偏移值和宽度随着柄的大小而增加。但增加的比例是不同的。通过对股骨颈骨折和股骨头无菌性坏死的原型茎的微动测量，Omniflex茎、Omniflex J-茎(Osteonics，Allendale，新泽西州)和AML茎(Depuy，华沙，印第安纳州)在2000N的轴向循环载荷下，茎的最大微运动平均值为…在20 Nm的旋转载荷作用下，股骨的最大平均微动量分别为38.0um、48.0um、55.2um和67.5um，均为前后方的近端微动。在2000N轴向载荷作用下，股骨近端的内侧压缩应变分别为完整股骨的18.6%、23.6%、25.9%和44.6%。为继发性骨关节炎设计的原型柄、Omniflex柄、Omniflex J柄和AML柄近端的根管充填率(横截率)分别为61.2%、59.8%、56.5%和53.8%，其中近端的RASP率(皮质区内粗糙的皮质率)分别为1.10%、1.69%、1.30%和5.17%。峡部的管腔充填率分别为75.8%、68.1%、68.6%和74.1%，峡部的Rasp率分别为0.69%、0.68%、0.70%和2.25%。因此，利用三维CT图像设计的假体假体具有最小的微动、最高的管腔充填率和最低的Rasp率，从而获得了满意的初期固定和与股骨管的相容性。较少