Division of Biokinesiology and Physical Therapy, University of Southern California, 1540 E Alcazar St, CHP-155, Los Angeles, CA 90089-9006, USA.
Phys Ther. 2010 Nov;90(11):1641-8. doi: 10.2522/ptj.20090391. Epub 2010 Aug 19.
Abnormal femoral torsion has been linked to osteoarthritis in the knee as well as to patellofemoral pain. Inexpensive, valid, and reliable methods for assessing femoral torsion are needed. Ultrasound (US) is a noninvasive and clinically accessible method that can be used for the assessment of bone morphology, such as femoral torsion.
The objective of this study was to determine the concurrent validity of US for the measurement of femoral torsion with a reference method, magnetic resonance imaging (MRI).
Repeated measurements of femoral torsion were obtained with US and MRI in a laboratory setting.
Twenty-eight people (4 men, 24 women; mean age=26.8 years [SD=4.0 years], mean body height=170.3 cm [SD=8.0 cm], mean body weight=64.7 kg [SD=9.8 kg]) participated in this study. T1-weighted axial oblique images of the femoral neck and epicondylar axis were acquired with a 1.5-T magnetic resonance system. Ultrasonographic measurements then were obtained by a tilting technique with a linear transducer that was 4.5 cm long and operated at a frequency of 10 MHz and a depth of 5 cm.
The average angles of anteversion measured by US and by MRI were 20.7 degrees (SD=11.0) and 19 degrees (SD=11.3), respectively. The reliability, reported as the intraclass correlation coefficient [ICC (2,1)], of repeated measurements of in vivo femoral torsion by US was .98. The reliability [ICC (2,1)] of magnetic resonance image analysis was .96. The standard error of the measurement for US was 2.2 degrees, and that for MRI was 1.9 degrees. The concurrent validity of US with MRI (R(2)) was .93 (r=.96).
Obtaining measurements by US requires appropriate training before data collection.
Ultrasound measurement of femoral torsion has high concurrent validity with in vivo MRI and may be used when an assessment of bony morphology is needed but MRI is not available.
异常股骨扭转与膝关节骨关节炎以及髌股疼痛综合征有关。需要一种廉价、有效且可靠的方法来评估股骨扭转。超声（US）是一种非侵入性且临床可及的方法，可用于评估骨骼形态，如股骨扭转。
本研究旨在确定 US 测量股骨扭转与参考方法磁共振成像（MRI）的一致性。
在实验室环境中使用 US 和 MRI 重复测量股骨扭转。
28 人（4 名男性，24 名女性；平均年龄=26.8 岁[SD=4.0 岁]，平均身高=170.3cm[SD=8.0cm]，平均体重=64.7kg[SD=9.8kg]）参与了这项研究。使用 1.5-T 磁共振系统采集股骨颈和髁间轴的 T1 加权轴向斜位图像。然后，使用长度为 4.5cm、工作频率为 10MHz 且深度为 5cm 的线性换能器通过倾斜技术获得超声测量值。
US 和 MRI 测量的前倾角平均角度分别为 20.7°（SD=11.0）和 19°（SD=11.3）。US 反复测量体内股骨扭转的可靠性，以组内相关系数[ICC（2,1）]表示，为.98。磁共振图像分析的可靠性[ICC（2,1）]为.96。US 的测量标准误差为 2.2°，MRI 为 1.9°。US 与 MRI 的一致性（R²）为.93（r=.96）。
在收集数据之前，使用 US 进行测量需要进行适当的培训。
超声测量股骨扭转与体内 MRI 具有高度一致性，在需要评估骨骼形态但无法进行 MRI 时可以使用。
