Dihlmann S W, Ochsner P E, Pfister A, Mayrhofer P
Orthopädische Klinik Kantonsspital Liestal, Schweiz.
Z Orthop Ihre Grenzgeb. 1994 Jul-Aug;132(4):286-94. doi: 10.1055/s-2008-1039976.
Out of 57 revised acetabular components, which were regularly checked, 47 had been replaced by a cemented Müller's acetabular reinforcement ring resp. a cementless Müller's Sl-shell with flange. Both types of cups are anchored in the acetabular roof with cancellous bone screws (tab. 1). 42 cases with radiograph series permitted a detailed analysis with the EBRA-method, a computer aided method for the evaluation of acetabular spatial migration based on standard radiographs of the pelvis. The clinical results were very satisfying (tab. 6). The screwed acetabular components migrated little, although, some essential displacements of the center of rotation (in relation to the anatomical position) had to be accepted. As was recognizable with today's inaccurate methods of measuring the center of the head, the displacement too far towards cranial influenced the migration tendency less than an excessive lateralisation. Especially satisfying is the fact, that no increased migration was observed after reconstruction bone grafting of severe acetabular defects, provided that at least a partly direct contact between the acetabular component and the original bone stock was obtained. For the first time EBRA shall be introduced here as a method which shows the migration and the spatial inclination of the acetabular cup in a vector chart.
在57个定期检查的翻修髋臼组件中，47个已被骨水泥固定的 Müller 髋臼加强环或无骨水泥的带翼 Müller Sl 型髋臼杯所替换。这两种髋臼杯均通过松质骨螺钉固定在髋臼顶（表1）。42例有系列X线片的病例可以采用EBRA方法进行详细分析，EBRA是一种基于骨盆标准X线片评估髋臼空间移位的计算机辅助方法。临床结果非常令人满意（表6）。带螺钉的髋臼组件移位很小，不过，不得不接受一些旋转中心（相对于解剖位置）的重要移位。从当今测量股骨头中心的不准确方法可以看出，向头侧移位过大对移位趋势的影响小于过度向外侧移位。特别令人满意的是，在严重髋臼缺损的重建植骨后，只要髋臼组件与原骨块之间至少有部分直接接触，就未观察到移位增加。在此首次引入EBRA作为一种在矢量图中显示髋臼杯移位和空间倾斜度的方法。
