Chai Yuan, Boudali A Mounir, Walter William L
Sydney Musculoskeletal Health, Kolling Institute, Faculty of Medicine and Health, The University of Sydney, St Leonards, NSW, Australia.
Department of Orthopaedic Surgery, Royal North Shore Hospital, St Leonards, NSW, Australia.
HSS J. 2023 May;19(2):187-192. doi: 10.1177/15563316221136128. Epub 2022 Nov 26.
Pelvic tilt (PT) is described as the pelvic orientation along the transverse axis, yet 4 PT definitions were established based on radiographic landmarks: anterior pelvic plane (PT), the center of femoral heads to sacral plate (PT), pelvic outlet (PT), and sacral slope (SS). These landmarks quantify a similar concept, yet understanding of their relationships is lacking, and their differences are sometimes ignored. : This study aimed to examine the correlations and differences of PT definitions for education and research purposes. : This study reviewed 105 sagittal pelvic radiographs of patients (68 men and 37 women) awaiting hip surgery at a single clinic. Hip hardware and spine pathologies were examined for subgroup analysis. Two observers annotated 4 PTs in a gender-dependent manner and repeated it after 6 months. The linear regression model and intraclass correlation coefficient (ICC) were applied with a 95% confidence interval. : The SS showed no correlation to the other 3 PT definitions, except for females in the hip hardware subgroup (n = 17). PT demonstrated very strong linear correlation to PT ( > 0.9) under the linear model PT = 0.951 × PT - 68.284. : The PT and PT can be calculated from each other under a simple linear regression equation, which enables comparisons between them. SS presented poor correlations to the other PT parameters, except for the female subgroup with hip implant that required further analysis; PT-related comparisons showed high anatomical variations between patients.
骨盆倾斜度(PT)被描述为骨盆沿横轴的方向,然而基于影像学标志确定了4种PT定义:骨盆前平面(PT)、股骨头中心至骶骨板(PT)、骨盆出口(PT)和骶骨斜率(SS)。这些标志量化了一个相似的概念,但对它们之间关系的理解不足,且它们的差异有时被忽视。本研究旨在为教育和研究目的,检验PT定义之间的相关性和差异。本研究回顾了在一家诊所等待髋关节手术的患者(68名男性和37名女性)的105张骨盆矢状位X线片。对髋关节植入物和脊柱病变进行亚组分析。两名观察者以性别依赖的方式标注4种PT,并在6个月后重复操作。应用线性回归模型和组内相关系数(ICC),置信区间为95%。除髋关节植入物亚组中的女性(n = 17)外,SS与其他3种PT定义均无相关性。在PT = 0.951×PT - 68.284的线性模型下,PT与PT表现出非常强的线性相关性(> 0.9)。PT和PT可通过简单的线性回归方程相互计算,这使得它们之间能够进行比较。除需要进一步分析的髋关节植入物女性亚组外,SS与其他PT参数的相关性较差;与PT相关的比较显示患者之间存在高度的解剖学差异。