McWilliams Anthony B, Grainger Andrew J, O'Connor Philip J, Redmond Anthony C, Stewart Todd D, Stone Martin H
NIHR Leeds Musculoskeletal Biomedical Research Unit, Chapel Allerton, Leeds, UK.
Hip Int. 2012 Sep-Oct;22(5):539-44. doi: 10.5301/HIP.2012.9751.
Leg length inequality (LLI) as a result of total hip replacement can cause considerable morbidity. Although LLI was described when the technique was popularised in the 1960s, it remains a significant challenge to arthroplasty surgeons. This study reviews the established practice for the measurement of LLI on plain antero-posterior radiograph, and compares these techniques to two methods used locally. The radiographs of 35 patients were measured using four techniques. All four methods yielded an interclass correlation co-efficient of ≥0.90 for inter reader reliability. This study shows that the four methods are comparable for reliability, while a composite method, measuring from the centre of femoral rotation to the inferior teardrop and then to the lesser trochanter, has the added advantage of providing extra information on component position as well as an overall measure of LLI.
全髋关节置换导致的肢体长度不等（LLI）可引起相当大的发病率。尽管LLI在20世纪60年代该技术普及之时就已被描述，但它仍然是关节置换外科医生面临的重大挑战。本研究回顾了在前后位平片上测量LLI的既定方法，并将这些方法与本地使用的两种方法进行比较。使用四种技术对35例患者的X线片进行测量。所有四种方法的读者间可靠性组内相关系数均≥0.90。本研究表明，这四种方法在可靠性方面具有可比性，而一种复合方法，即从股骨旋转中心测量至泪滴下缘然后再至小转子，具有提供假体位置额外信息以及LLI整体测量值的额外优势。
