Bragdon Charles R, Thanner Jonas, Greene Meridith E, Malchau Henrik, Digas Georgios, Harris William H, Kärrholm Johan
Orthopaedic Biomechanics and Biomaterials Laboratory and the Adult Reconstructive Unit of the Department of Orthopaedic Surgery of Massachusetts General Hospital and Harvard Medical School, Boston, 02114, USA.
Clin Orthop Relat Res. 2006 Jul;448:46-51. doi: 10.1097/01.blo.0000224012.50292.67.
Evaluation of polyethylene acetabular component wear in total hip arthroplasties commonly is performed using serial radiographs of the hip by measuring the change in the location of the center of the femoral head in relation to the acetabular component. Of the different methods currently used for this purpose, radiostereometric analysis (RSA) is considered the most accurate and precise. In all such radiographic studies, it is assumed the femoral head is seated into the deepest portion of the acetabular component during all radiographic examinations. Although most radiographs used for wear measurements are taken with the patient supine, we questioned whether standing radiographs, with substantial joint load, are better suited for these measurements. We evaluated two groups of patients having total hip arthroplasty who had radiostereometric radiographs taken in supine and standing positions. The average femoral head penetration that occurred between the 6-month and 2-year time interval was measured with radiographs taken in the standing or supine position. We found no difference between the average total femoral head penetration when using supine or standing radiographs.
在全髋关节置换术中，评估聚乙烯髋臼部件的磨损通常是通过拍摄髋关节的系列X线片，测量股骨头中心相对于髋臼部件位置的变化来进行的。在目前用于此目的的不同方法中，放射立体测量分析（RSA）被认为是最准确和精确的。在所有此类放射学研究中，均假定在所有放射学检查期间股骨头都位于髋臼部件的最深部分。尽管大多数用于磨损测量的X线片是在患者仰卧位时拍摄的，但我们质疑在关节承受较大负荷的站立位X线片是否更适合这些测量。我们评估了两组接受全髋关节置换术的患者，他们分别拍摄了仰卧位和站立位的放射立体测量X线片。通过站立位或仰卧位拍摄的X线片测量了6个月至2年时间间隔内发生的平均股骨头下沉量。我们发现使用仰卧位或站立位X线片时，平均总股骨头下沉量没有差异。
