Leitzes Anne H, Potter Hollis G, Amaral Terry, Marx Robert G, Lyman Stephen, Widmann Roger F
Hospital for Special Surgery, Weill Medical College of Cornell University, New York, NY 10021, USA.
J Pediatr Orthop. 2005 Nov-Dec;25(6):747-9. doi: 10.1097/01.bpo.0000173246.12184.a5.
The purpose of this study was to compare MRI scanogram with traditional radiographic methods for measurement of limb length. The authors hypothesized that MRI scanogram would be as reliable and accurate as radiographic scanogram in measurement of limb length without exposing patients to ionizing radiation. Twelve cadaveric femurs were measured using AP conventional radiographic scanogram, CT scanogram, MRI scanogram, and electronic caliper. Three orthopaedists performed two separate measurements using each technique. Intraobserver and interobserver variability was assessed for each of the three radiographic techniques. Accuracy was assessed by comparison of radiographic measurements to electronic caliper measurements of femur length. The reliability of all three radiographic limb length measurement techniques was excellent (ICC > 0.99). The accuracy of plain radiographic scanogram was slightly superior to CT scanogram and MRI scanogram. The mean absolute differences for radiographic, CT, and MRI scanograms compared with the gold standard, direct caliper measurement, were 0.52 mm, 0.68 mm, and 2.90 mm, respectively. All three scanogram techniques showed excellent reliability and accuracy. Radiographic scanogram remains the gold standard for leg length measurement. MRI scanogram is slightly less accurate compared with radiographic scanogram, but it does not use ionizing radiation. MRI scanogram merits clinical study and comparison with the traditional radiographic scanogram method for measurement of limb length.
本研究的目的是比较MRI扫描图与传统放射学方法在测量肢体长度方面的差异。作者假设，在测量肢体长度时，MRI扫描图与放射学扫描图一样可靠且准确，同时不会使患者暴露于电离辐射。使用前后位传统放射学扫描图、CT扫描图、MRI扫描图和电子卡尺对12具尸体股骨进行测量。三位骨科医生使用每种技术进行了两次独立测量。对三种放射学技术中的每一种都评估了观察者内和观察者间的变异性。通过将放射学测量结果与股骨长度的电子卡尺测量结果进行比较来评估准确性。所有三种放射学肢体长度测量技术的可靠性都非常出色（组内相关系数>0.99）。普通放射学扫描图的准确性略优于CT扫描图和MRI扫描图。与金标准直接卡尺测量相比，放射学、CT和MRI扫描图的平均绝对差异分别为0.52毫米、0.68毫米和2.90毫米。所有三种扫描图技术都显示出出色的可靠性和准确性。放射学扫描图仍然是腿长测量的金标准。与放射学扫描图相比，MRI扫描图的准确性略低，但它不使用电离辐射。MRI扫描图值得进行临床研究，并与传统放射学扫描图方法在肢体长度测量方面进行比较。
