Cleveland R H, Kushner D C, Ogden M C, Herman T E, Kermond W, Correia J A
Department of Radiology, Massachusetts General Hospital, Boston 02114.
Invest Radiol. 1988 Apr;23(4):301-4. doi: 10.1097/00004424-198804000-00010.
Leg length discrepancy (LLD) may be determined by comparison of leg (lower extremity) lengths measured during physical examination or by radiographic means. Leg lengths may be measured with the patient in standing, weight-bearing position or in supine position. We used a low dose digital radiographic unit to test the hypothesis that there is a difference in LLD determined from radiographs obtained with the patient standing and those obtained with the patient supine. Conventional physical examination measurements also were compared with the radiographic measurements. The amount of LLD that is clinically meaningful has not been established, although 10 to 12 mm has been used as a threshold difference of clinical meaningfulness in the past. Analysis of our data, using 10 mm as the threshold of difference, reveals high level correlation by linear regression analysis and no significant difference by t-test between measurements obtained from standing and supine radiographs. A weak correlation and statistical difference existed between each set of radiographic measurements and physical examination measurements.
腿长差异（LLD）可通过体格检查时测量的腿（下肢）长度比较或通过影像学方法来确定。腿长测量可在患者站立、负重位或仰卧位时进行。我们使用低剂量数字放射成像设备来检验这一假设：由患者站立位获得的X线片所确定的LLD与患者仰卧位获得的X线片所确定的LLD存在差异。同时还将传统体格检查测量结果与影像学测量结果进行了比较。尽管过去曾将10至12毫米用作具有临床意义的差异阈值，但具有临床意义的LLD量尚未确定。以10毫米作为差异阈值对我们的数据进行分析，通过线性回归分析显示相关性高，站立位和仰卧位X线片测量结果之间经t检验无显著差异。每组影像学测量结果与体格检查测量结果之间存在弱相关性和统计学差异。
