Validity of the Alpha Angle Measurement on Plain Radiographs in the Evaluation of Cam-type Femoroacetabular Impingement
Validity of the Alpha Angle Measurement on Plain Radiographs in the Evaluation of Cam-type Femoroacetabular Impingement
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DOI：
10.1007/s11999-010-1624-x
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发表时间：
2011-02-01
影响因子：
4.2
通讯作者：
Beaule, Paul E.
中科院分区：
文献类型：
--
作者：
Barton, Cefin;Salineros, Matias J.;Beaule, Paul E.
凸轮型股骨髋臼撞击是继发于前上股骨头-颈交界处缺乏弹性，导致股骨头-颈偏心距减小和股骨头非球面度降低。这种形态学畸形可以通过MRI和X线平片检测，并使用α角进行量化。问题/目的我们评价X线平片在诊断凸轮型畸形中的准确性和可重复性。（37名女性，31名男性），平均年龄38岁（范围，17-60岁）进行了髋关节内病理治疗，其中43个髋关节有凸轮型股骨髋臼撞击，25个髋关节有孤立的盂唇撕裂。所有患者均在平片上测量α角结果Dunn切面诊断骨盆骨折的敏感性为91%，特异性为88%，阳性预测值为93%，阴性预测值为84%，诊断股骨髋臼撞击相关凸轮畸形的准确率为90%。Pearson相关系数之间的MRI和平片的值分别为0.702，0.552，和0.349邓恩，crosstable侧，和AP views，respectively.Conclusions我们的观察验证了临床使用的邓恩视图中的凸轮型femorocabulary撞击的股骨头颈部轮廓的评价。
Background Cam-type femoroacetabular impingement is secondary to lack of concavity at the anterosuperior femoral head-neck junction, resulting in reduced femoral head-neck offset and femoral head asphericity. This morphologic deformity can be detected by MRI and plain radiographs and quantified using the alpha angle.Questions/purposes We evaluated the accuracy and reproducibility of plain radiography in the diagnosis of cam-type deformity.Methods Sixty-eight patients (37 females, 31 males) with a mean age of 38 years (range, 17-60 years) were treated for intraarticular hip pathology with 43 hips having cam-type femoroacetabular impingement and 25 having isolated labral tears. All patients had alpha angle measurements made on plain radiographs (AP pelvis, crosstable lateral, Dunn view) and multiplanar MRI using an alpha angle of more than 50.5 degrees as the gold standard.Results The Dunn view had a sensitivity of 91%, specificity of 88%, positive predictive value of 93%, negative predictive value of 84%, and accuracy of 90% for diagnosing the cam deformity associated with femoroacetabular impingement. The Pearson correlation coefficients between the MRI and plain radiography values were 0.702, 0.552, and 0.349 for the Dunn, crosstable lateral, and AP views, respectively.Conclusions Our observations validate the clinical use of the Dunn view in the evaluation of the femoral head-neck contour in cam-type femoroacetabular impingement.