Oddy M J, Jones M J, Pendegrass C J, Pilling J R, Wimhurst J A
Department of Orthopaedics, The Norfolk and Norwich University Hospital NHS Trust, Colney Lane, Norwich, Norfolk NR4 7UZ, UK.
J Bone Joint Surg Br. 2006 May;88(5):581-5. doi: 10.1302/0301-620X.88B5.17184.
In 20 patients undergoing hybrid total hip arthroplasty, the reproducibility and accuracy of templating using digital radiographs were assessed. Digital images were manipulated using either a ten-pence coin as a marker to scale for magnification, or two digital-line methods using computer software. On-screen images were templated with standard acetate templates and compared with templating performed on hard-copy digital prints. The digital-line methods were the least reliable and accuracy of sizing compared with the inserted prostheses varied between -1.6% and +10.2%. The hard-copy radiographs showed better reproducibility than the ten-pence coin method, but were less accurate with 3.7% undersizing. The ten-pence coin method was the most accurate, with no significant differences for offset or acetabulum, and undersizing of only 0.9%. On-screen templating of digital radiographs with standard acetate templates is accurate and reproducible if a radiopaque marker such as a ten-pence coin is included when the original radiograph is taken.
在20例接受混合式全髋关节置换术的患者中，评估了使用数字X线片进行模板测量的可重复性和准确性。数字图像的处理，要么使用一枚十便士硬币作为标记来缩放以校正放大倍数，要么使用计算机软件的两种数字线方法。在屏幕图像上用标准醋酸盐模板进行模板测量，并与在硬拷贝数字打印件上进行的模板测量相比较。数字线方法最不可靠，与植入假体相比，尺寸测量的准确性在-1.6%至+10.2%之间变化。硬拷贝X线片显示出比十便士硬币法更好的可重复性，但尺寸小3.7%，准确性较差。十便士硬币法最准确，在偏心距或髋臼方面无显著差异，尺寸仅小0.9%。如果在拍摄原始X线片时包含不透射线的标记物（如十便士硬币），则用标准醋酸盐模板对数字X线片进行屏幕模板测量是准确且可重复的。
