Kim Jihang, Choi Jung-Ah, Lee Eugene, Lee Kyung Ryeol
1 Department of Radiology, Seoul National University Bundang Hospital, Gyeongi-do, Republic of Korea.
2 Department of Radiology, Hallym University College of Medicine, Dongtan Sacred Heart Hospital, 40 Seokwoodong, Hwaseong, Gyeonggi-do 445-170, Republic of Korea.
AJR Am J Roentgenol. 2015 Jul;205(1):W100-5. doi: 10.2214/AJR.14.13130.
The objective of our study was to investigate the prevalence of imaging features on CT thought to be associated with femoroacetabular impingement (FAI) and the associations among them.
Of 430 consecutive adult patients (age range, 18-40 years) who underwent hip CT at our institution for hip symptoms or trauma surveillance, the asymptomatic hips were selected for the study, which resulted in the inclusion of 473 hip joints in the study group. Images were obtained using an MDCT scanner and were reformatted using a bone algorithm. The CT images were retrospectively evaluated by two radiologists for features indicative of FAI such as the alpha angle, femoral head-neck offset, acetabular version angle, and center-edge angle. The intraclass correlation coefficient was used to evaluate intra- and interobserver variabilities. Associations among these parameters were evaluated by calculating the odds ratio between each of the parameters separately.
Of the 473 asymptomatic hip joints we studied, 190 (40%) joints showed at least one of the following features on CT: alpha angle greater than 55°, head-neck offset less than 8 mm, acetabular version angle less than 15°, or center-edge angle greater than 40°. At least one feature was found in the hips of male patients (43.2%), which is more frequently than in the hips of female patients (35.4%). There was a high degree of coexistence (odds ratio > 2) among these CT findings.
Imaging features on CT that are known to be associated with FAI are common in asymptomatic adult hip joints, especially in men, with a high degree of coexistence among the findings.
我们研究的目的是调查CT上被认为与股骨髋臼撞击症（FAI）相关的影像特征的患病率及其相互之间的关联。
在我们机构因髋关节症状或创伤监测而接受髋关节CT检查的430例连续成年患者（年龄范围18 - 40岁）中，选择无症状的髋关节进行研究，研究组共纳入473个髋关节。使用多层螺旋CT扫描仪获取图像，并采用骨算法进行图像重建。两名放射科医生对CT图像进行回顾性评估，以寻找提示FAI的特征，如α角、股骨头颈偏移、髋臼扭转角和中心边缘角。组内相关系数用于评估观察者内和观察者间的变异性。通过分别计算每个参数之间的比值比来评估这些参数之间的关联。
在我们研究的473个无症状髋关节中，190个（40%）关节在CT上显示至少以下一种特征：α角大于55°、头颈偏移小于8mm、髋臼扭转角小于15°或中心边缘角大于40°。男性患者髋关节中至少发现一种特征的比例（43.2%）高于女性患者髋关节（35.4%）。这些CT表现之间存在高度共存性（比值比>2）。
已知与FAI相关的CT影像特征在无症状成年髋关节中很常见，尤其是在男性中，且这些表现之间存在高度共存性。
