320层动态容积CT对正常人髌骨运动轨迹的初步研究

目的 探讨320层容积CT运动功能成像在正常人髌骨运动轨迹的应用价值.方法 回顾性分析30例应用320层容积CT运动功能成像检查的动态膝关节扫描数据.所有志愿者分别在屈膝0°～120°时行320层CT检测,测量不同屈曲角度时髌骨中点在三维坐标中的位置,分析不同角度时髌股关节排列关系.结果 随膝角的变化,在0°～90°时,髌骨迅速沿Y轴方向(即矢状面)向下移动约(53.87±0.45)mm,随后进入平台期,变化甚微.当屈膝至10°～30°时,髌骨沿X轴向内侧移动达最大程度,范围在(2.31±0.52)～(3.36±0.43)mm,而后向外侧运动,至120°时达到最大值,平均为(8.53±0.44)mm.在Z轴上,初时呈平台期,30°后呈快速下降趋势.在整个屈膝过程中,髌骨的滑行轨迹类似于开口向外的弧形.结论 320层容积CT运动功能成像可以快速、无痛对髌骨运动轨迹进行准确定位.

Abstract：

Objective To evaluate the diagnostic value of tracking movement of normal patellar using volume scan on sensation 320 CT. Method Data of dynamic scans of 30 knees was collected using the motor function of 320 CT and retrospectively analyzed. The data of movement of the patellorfemoral joint was obtained during flexion (from 0° to 120°) within 10-sec by 320 CT from all volunteers. The 3D coordinate of the center of patella was recorded to investigate the dispose relation of patellofemoral joint.Result With the knee angle changed from 0° to 90°, the patella moved rapidly along the Y-axis direction ( sagittal plane) down about (53.87 ± 0. 45 ) mm, and then entered the plateau phase with little change.When the knee flexion reached 10°-30° ,the patellar movement along the X-axis reached the largest range of (2. 31 ±0. 52)-(3.36 ± 0. 43 ) mm, and subsequently moved to the opposite lateral direction with the maximum about (8. 53 ± 0. 44 ) mm at 120°. In the Z axis, the track initially showed plateau, and then presented a rapidly downward trend after 30°. The patellar tracking is like an outward arc during the whole knee flexion. Conclusion The motor functional imaging of 320 CT can pinpoint the patelar tracking in a fast, painless way.

An initial study of tracking movement of normal patellar using volume scan on sensation 320 CT

Objective To evaluate the diagnostic value of tracking movement of normal patellar using volume scan on sensation 320 CT. Method Data of dynamic scans of 30 knees was collected using the motor function of 320 CT and retrospectively analyzed. The data of movement of the patellorfemoral joint was obtained during flexion (from 0° to 120°) within 10-sec by 320 CT from all volunteers. The 3D coordinate of the center of patella was recorded to investigate the dispose relation of patellofemoral joint.Result With the knee angle changed from 0° to 90°, the patella moved rapidly along the Y-axis direction ( sagittal plane) down about (53.87 ± 0. 45 ) mm, and then entered the plateau phase with little change.When the knee flexion reached 10°-30° ,the patellar movement along the X-axis reached the largest range of (2. 31 ±0. 52)-(3.36 ± 0. 43 ) mm, and subsequently moved to the opposite lateral direction with the maximum about (8. 53 ± 0. 44 ) mm at 120°. In the Z axis, the track initially showed plateau, and then presented a rapidly downward trend after 30°. The patellar tracking is like an outward arc during the whole knee flexion. Conclusion The motor functional imaging of 320 CT can pinpoint the patelar tracking in a fast, painless way.