髌股关节排列紊乱的CT检查

CT of the Patellofemoral Malaligment

目的 评价髌股关节排列紊乱的CT检查价值。方法 膝关节疼痛患者2 1例(2 6膝) ,对膝关节屈曲0°、15°、30°髌股关节进行CT检查,对髌骨的位置作出定性评价。结果 在伸展状态下至屈膝30°股肌收缩导致髌骨出现移位和倾斜。最常见的异常是髌骨移外侧位伴倾斜。在屈膝30°股肌收缩时,在患膝组中10个未发现髌股关节异常排列的膝中,有3例出现外移和/或倾斜。余下7个未发现髌股关节异常排列的膝中,在屈膝15°股肌收缩时,发现有3个为潜在性髌骨位置异常。结论 屈膝0°～30°在股肌收缩状态下,髌股关节CT扫描是检出髌股关节排列紊乱的有效手段。

Objective The purpose of this study was to evaluate the patellar motion by CT in patients with patellofemoral malaligment.Methods Twenty-one patients(26 knees),with knee pain syndrome participated in the study.The patellofemoral joints were examined with the knee in 0°,15°,30° of flexion.The position of the patella was obtained at each angle of the knee flexion the condition of the thigh muscle contraction.Results In 30° of flexion to extension,contraction of the thigh muscle caused shift and tilt of the patella in symptomatic knees.The most frequently observed was tilt and lateralization.With the contraction of the muscle, among the ten symptomatic knees which were normal when their muscle were relaxing,three had lateral tilt or shift in 30° of flexion.With the contraction of the muscle,three of the remained seven normal knee were found potential abnormity at the patella position in 15° of flexion to extension.Conclusion By the CT qualitative evaluation of the imaging in the 0° ～30° of flexion with thigh muscle contraction is effective way for a correct diagnosis of the patellofemoral malaligment.