Large ball metal on metal hips obscure cup angle measurement on plain radiographs
Large ball metal on metal hips obscure cup angle measurement on plain radiographs
复制标题
DOI：
10.1177/112070000901900405
复制
发表时间：
2009-10-01
影响因子：
1.5
通讯作者：
Cobb, Justin
中科院分区：
文献类型：
--
作者：
Hart, Alister J.;Dandachli, Wael;Cobb, Justin
与X线平片相比，CT是一种更有效的髋臼假体方向测量方法。大直径金属股骨头由于髋臼边缘模糊，可能会进一步影响平片的有效性。我们通过使用X线平片和基于3D CT的测量，测量49例金属对金属髋关节表面置换术的髋臼杯角度（倾斜度和版本），量化了这种影响。Bland-Altman图显示平片和CT测量之间的一致性较差，一致性的2个标准差限值为：髋臼杯倾角为+7至-15度;髋臼杯扭转角为+16至-31度。髋臼杯位置的X线平片和CT测量值之间的巨大差异可能是由于大直径金属股骨头可能会掩盖髋臼杯边缘。我们已经使用了一个金属伪影减少CT协议与3D成像软件包，以克服这个问题，并测量髋臼杯相对于骨盆前平面的位置。(Hip国际2009; 19：323-9）
CT when compared to plain radiograph is known to be a more valid measure of acetabular component orientation. The validity of plain radiographs may be further compromised by large diameter metal femoral heads because of obscuration of the acetabular rim. We quantified this effect by measuring acetabular cup angles (inclination and version) of 49 metal on metal (MOM) hip resurfacings using plain radiographs and 3D CT based measurement. Bland-Altman plots revealed poor agreement between plain radiographic and CT based measurement with 2 standard deviation limits of agreements of: +7 to -15 degrees for cup inclination angle; and +16 to -31 degrees for cup version angle. The large differences between plain radiographic and CT measurement of cup positions are probably due to the large diameter metal femoral head that can obscure the cup margin. We have used a metal artefact reduction CT protocol with a 3D imaging software package to overcome this problem and measure cup position relative to the Anterior Pelvic Plane. (Hip International 2009; 19: 323-9)