CT三维重建测量发育性髋关节脱位髋臼股骨头的平均覆盖率

背景：利用多排螺旋CT容积再现技术进行三维重建可清晰显示髋臼及股骨头的空间立体结构，为测量患儿髋臼股骨头的平均覆盖率及观察异常髋臼发育变化提供帮助。目的：利用多排螺旋CT三维重建技术连续4年测量发育性髋关节脱位患儿髋臼股骨头的平均覆盖率的变化特点。方法：回顾性分析发育性髋关节脱位行手法闭合复位外固定的患儿53例，分别于整复前、整复后24 h内、整复后12，24，36，48个月时，行多排螺旋CT髋臼轴位平扫及利用图像处理系统对患儿髋臼股骨头的平均覆盖面积进行重建和测量。结果与结论：闭合复位后患儿髋臼股骨头覆盖率均显著高于治疗前(P < 0.01)。随访4年内，闭合复位后患儿髋臼股骨头覆盖面积逐渐增加，第1年内增加面积最大，第4年时接近正常。说明多排螺旋CT三维重建技术能清晰显示两者之间的立体位置关系，为发育性髋关节脱位患儿髋臼与股骨头位置关系的研究提供了新的手段；三维重建后测量闭合复位后患儿髋臼股骨头覆盖率，其测量值高于治疗前。

Average acetabular coverage of femoral head after developmental dislocation of the hip measured by CT three-dimensional reconstruction

BACKGROUND:A three-dimensional structure of acetabular and femoral head can be clearly displayed by using three-dimensional reconstruction through volume rendering technique of multi-slice spiral CT, and provide help to measure the average acetabular coverage of femoral head and observe the development change of abnormal acetabulum.OBJECTIVE:To measure the changes of average acetabular coverage of femoral head in children with developmental dislocation of the hip by multi-slice spiral CT three-dimensional reconstruction for 4 consecutive years.METHODS:Fifty-three cases of development dislocation children treated with closed reduction and external fixation were included to perform the retrospective analysis. Before the restoration, within 24 hours after restoration, the entire complex after 12, 24, 36 and 48 months, the multi-slice spiral CT scan axial acetabular and image processing system was used to reconstruct and measure the average acetabular coverage of femoral head.RESULTS AND CONCLUSION:The average acetabular coverage of femoral head after closed reduction was significantly higher than that before treatment (P < 0.01). After followed-up for 4 years, the average acetabular coverage of femoral head was gradually increased after closed reduction, it increased most within 1 year, and closed to the normal control group at the 4th year. The multi-slice spiral CT three-dimensional reconstruction can clearly show the relationship between three-dimensional positiosns, and provide a new mean for the research of the relationship between hips of children with developmental dislocation and the position of femoral head; the average acetabular coverage of femoral head measured by three-dimensional reconstruction after closed reduction is higher than that before treatment.