Grochowski S J, Amrami K K, Kaufman K
Department of Orthopedic Surgery, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA.
Skeletal Radiol. 2005 Oct;34(10):644-8. doi: 10.1007/s00256-005-0944-5. Epub 2005 Jul 15.
To design a semi-automated program to measure minimum patellofemoral joint space width (JSW) using standing lateral view radiographs.
Lateral patellofemoral knee radiographs were obtained from 35 asymptomatic subjects. The radiographs were analyzed to report both the repeatability of the image analysis program and the reproducibility of JSW measurements within a 2 week period. The results were also compared with manual measurements done by an experienced musculoskeletal radiologist.
The image analysis program was shown to have an excellent coefficient of repeatability of 0.18 and 0.23 mm for intra- and inter-observer measurements respectively. The manual method measured a greater minimum JSW than the automated method. Reproducibility between days was comparable to other published results, but was less satisfactory for both manual and semi-automated measurements. The image analysis program had an inter-day coefficient of repeatability of 1.24 mm, which was lower than 1.66 mm for the manual method.
A repeatable semi-automated method for measurement of the patellofemoral JSW from radiographs has been developed. The method is more accurate than manual measurements. However, the between-day reproducibility is higher than the intra-day reproducibility. Further investigation of the protocol for obtaining sequential lateral knee radiographs is needed in order to reduce the between-day variability.
设计一个半自动程序，利用站立位侧位X线片测量髌股关节间隙最小宽度（JSW）。
从35名无症状受试者获取髌股关节侧位膝关节X线片。对这些X线片进行分析，以报告图像分析程序的重复性以及2周内JSW测量值的可重复性。结果还与一位经验丰富的肌肉骨骼放射科医生的手动测量结果进行了比较。
图像分析程序显示，观察者内和观察者间测量的重复性系数分别为0.18和0.23mm，表现出色。手动测量方法测得的最小JSW大于自动测量方法。不同日期之间的可重复性与其他已发表结果相当，但手动和半自动测量的可重复性均不太令人满意。图像分析程序的日间重复性系数为1.24mm，低于手动测量方法的1.66mm。
已开发出一种可重复的半自动方法，用于从X线片测量髌股关节JSW。该方法比手动测量更准确。然而，日间可重复性高于日内可重复性。为了减少日间变异性，需要进一步研究获取连续膝关节侧位X线片的方案。
