Liu Ruiyu, Wang Kunzheng, Wang Chunsheng, Tong Zhiqin, Ning Wende, Yang Xiangchun
Department of Orthopaedics, the Second Affiliated Hospital to Medical College of Xi'an Jiaotong University, Xi'an Shaanxi, 710004, P.R.China.
Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi. 2008 Jun;22(6):643-5.
To explore the methods and application value of surface shaded display (SSD) and multiplanar reconstruction (MPR) in the evaluation of acetabular morphology in patients with developmental dysplasia of the hip (DDH) before total hip arthroplasty (THA).
From October 2003 to November 2006, 17 patients (3 males and 14 females, aging from 35 years to 61 years) with osteoarthritis secondary to DDH were scanned with spiral CT preoperatively. According to the Crowe standard, 19 dysplasia hips were classified as type I in 4 hips, type II in 9 hips, type III in 6 hips. The obtained hip CT data were developed with SSD and MPR to observe spatial position and bone stock of the acetabula.
The dislocated extent was 25%-89% in these dysplasia hips according to the Crowe method and their sharp angles all exceeded 45 degrees. Bone defect occurred to each of the acetabula, among which it was located in anterosuperior acetabulum in 5 hips, in superolateral acetabulum in 11 hips and in posterosuperior acetabulum in 3 hips. The hip images made with MPR showed that the minimum thickness of the medial wall of acetabula ranged from 2.0 mm to 10.9 mm. Among 15 unilateral dysplasia patients, the opening difference and depth difference between the dysplasia acetabulum and the contralateral one ranged from 2.7 mm to 19.1 mm and from 2.3 mm to 13.1 mm, respectively.
SSD and MPR of spiral CT are effective methods in evaluating acetabular morphology preoperation and contribute to intraoperative acetabular reconstruction in patients with DDH performed THA.
探讨表面阴影显示（SSD）和多平面重建（MPR）在全髋关节置换术（THA）前评估发育性髋关节发育不良（DDH）患者髋臼形态中的方法及应用价值。
2003年10月至2006年11月，对17例（男3例，女14例，年龄35岁至61岁）因DDH继发骨关节炎的患者术前行螺旋CT扫描。根据Crowe标准，19个发育不良髋关节中，Crowe I型4髋，Crowe II型9髋，Crowe III型6髋。将获得的髋关节CT数据进行SSD及MPR处理，观察髋臼的空间位置及骨量情况。
按Crowe法测量，这些发育不良髋关节的脱位程度为25% - 89%，其髋臼锐角均超过45°。各髋臼均有骨缺损，其中5髋位于髋臼前上方，11髋位于髋臼外上方，3髋位于髋臼后上方。MPR重建的髋关节图像显示髋臼内壁最小厚度为2.0 mm至10.9 mm。15例单侧发育不良患者中，发育不良侧髋臼与对侧髋臼的开口差异为2.7 mm至19.1 mm，深度差异为2.3 mm至13.1 mm。
螺旋CT的SSD及MPR是术前评估髋臼形态的有效方法，有助于DDH患者行THA术中髋臼重建。
