Rhodes D W, Mansfield E R, Bishop P A, Smith J F
University of Alabama, Tuscaloosa, USA.
J Manipulative Physiol Ther. 1995 Jul-Aug;18(6):343-6.
To determine if prone leg length measurements for inequality are valid to estimate standing X-ray measured differences.
Leg length inequality (LLI) was measured, in millimeters, with each patient prone and with a standing X-ray, by an experienced chiropractor. Correlation between the two was calculated, and dependent t test performed.
Private chiropractic practice.
The first 50 new patients with low back pain (LBP) who were X-rayed were included in the study.
Correlation between the two variables was 0.71. Standard error of estimation was 5.4 mm. In 54% of subjects, the prone measurement was within 3 mm of the X-ray LLI; in 12%, however, opposite legs were identified as being "shorter" between the two methods. In 76% of patients, prone measurements were within 6 mm of X-ray, but there was 12-mm difference between the two measurement methods in 8% of the comparisons.
Despite positive correlation, prone leg length measurements for inequality are not entirely valid estimates of standing X-ray differences. Large differences between prone and X-ray measurements in some cases indicate that one should be cautious when using the prone method alone to estimate leg length discrepancy. Additional research is needed to determine the causes of measurement differences between the two methods. Other methods for estimating standing leg length differential must be developed and evaluated for validity.
确定俯卧位腿长不等测量值用于估计站立位X线测量差异是否有效。
由一名经验丰富的脊椎按摩师以毫米为单位测量每位患者俯卧位和站立位X线时的腿长不等（LLI）。计算两者之间的相关性，并进行配对t检验。
私人脊椎按摩诊所。
纳入首批50例接受X线检查的新发腰痛（LBP）患者。
两个变量之间的相关性为0.71。估计标准误差为5.4毫米。在54%的受试者中，俯卧位测量值与X线LLI相差在3毫米以内；然而，在12%的受试者中，两种方法确定的相对腿长结果相反。在76%的患者中，俯卧位测量值与X线相差在6毫米以内，但在8%的比较中，两种测量方法相差12毫米。
尽管存在正相关，但俯卧位腿长不等测量值并非站立位X线差异的完全有效估计值。某些情况下俯卧位测量值与X线测量值之间的巨大差异表明，单独使用俯卧位方法估计腿长差异时应谨慎。需要进一步研究以确定两种方法测量差异的原因。必须开发并评估其他估计站立位腿长差异的方法的有效性。
