科研之友
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摘要
To compare two methods of measuring femoral neck anteversion angle (FNA): A 2D method used at Odense University Hospital until 2010, and a method labeled 3D-OUH. The latter method makes corrections to compensate for errors introduced by the individual placement of patients in the CT scanner. %26lt;br%26gt;Twenty-six CT-examined patients were included: nine men and 17 women. The right side FNA was measured twice with each method by one observer, measuring intraobserver variability. Both methods are based on the following anatomy: femoral head center, center at the level of lesser trochanter and posterior apex of the femoral condyles. The 3D-OUH method corrects for the individual orientation of femur by realigning it prior to measurement, in accordance to Murphy et al.%26apos;s original definition of FNA. The intercondylar notch center of the knee and center at lesser trochanter was used in the realignment. %26lt;br%26gt;The 2D method significantly overestimated FNA compared to 3D-OUH by 4.2A degrees (95 % CI: 2.8A degrees; 5.6A degrees), p %26lt; 0.0001. All measurements with the 3D method needed clock-wise correction in the coronal plane, suggesting patient positioning as a consistent source of overestimation by the 2D method. The 3D-OUH method had a lower intraobserver variability with a limit of agreement (LOA) of -2.4A degrees to 2.1A degrees against that of the 2D method of -3.4A degrees to 3.8A degrees %26lt;br%26gt;Mean anteversion was 4.2A degrees (95 % CI: 2.8A degrees; 5.6A degrees) lower with the 3D-OUH method than with the 2D method. The 3D-OUH method eliminated an obvious source of error, namely the individual orientation of femur during CT-examination. Moreover, intraobserver variability was improved with the 3D-OUH method.
- 出版日期2013-8
