Miller T T, Staron R B, Feldman F
Department of Radiology, North Shore University Hospital, Manhasset, NY 11030, USA.
AJR Am J Roentgenol. 1996 Aug;167(2):339-41. doi: 10.2214/ajr.167.2.8686598.
The aim of this study was to determine if the radiographic assessment of patella alta using the patellar tendon:patella ratio can be applied to sagittal MR images of the knee.
Sagittal T1-weighted MR images of 46 knees were reviewed with corresponding radiographs. After lengths of the patella and patellar tendon were measured on the lateral radiographs and on the sagittal mid patellar images, the tendon:patella ratios were calculated.
We found the mean tendon:patella ratio on radiographs to be 1.0 +/- 0.2 (SD) and on MR imaging, 1.1 +/- 0.1. These two values were not significantly different (p = .01) and had good-to-excellent correlation (r = .7). We found no statistical difference between the sexes on either radiographs or MR imaging, nor did we find statistical differences on MR imaging between the tendon:patella ratios of straight and wavy patellar tendons.
As on radiographs, patellar height can be reliably assessed on sagittal MR imaging using the patellar tendon:patella ratio. On sagittal MR imaging, patella alta is suggested at values greater than 1.3 (1.1 + 2 SD).
本研究的目的是确定使用髌腱：髌骨比值对高位髌骨进行的影像学评估是否可应用于膝关节矢状面磁共振成像（MR）。
回顾了46个膝关节的矢状面T1加权MR图像及相应的X线片。在侧位X线片和髌骨矢状面正中图像上测量髌骨和髌腱的长度后，计算腱：髌骨比值。
我们发现X线片上腱：髌骨比值的平均值为1.0±0.2（标准差），MR成像上为1.1±0.1。这两个值无显著差异（p = 0.01），且具有良好到极好的相关性（r = 0.7）。我们发现X线片或MR成像上两性之间无统计学差异，在MR成像上，直髌腱和波浪状髌腱的腱：髌骨比值之间也无统计学差异。
与X线片一样，使用髌腱：髌骨比值在膝关节矢状面MR成像上可可靠地评估髌骨高度。在矢状面MR成像上，当比值大于1.3（1.1 + 2标准差）时提示高位髌骨。
