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目的通过膝关节多角度屈曲MR扫描,观察膝关节炎髌股关节软骨损伤的位置,判断最容易引起髌股关节软骨损伤的运动角度,探讨膝关节的安全运动方式。方法对22例骨关节炎患者的膝关节分别在伸直位和被动屈曲0°、10°、20°、30°、40°、50°、60°的状态下进行快速自旋回波质子加权像加脂肪抑制序列(PD-TSE-FS)扫描,矢状位图像上观察髌股关节软骨损伤的位置。结果髌股关节软骨内T2WI信号异常4处,局限性软骨变薄20处,关节软骨局限性缺损12处。膝关节被动屈曲时,软骨损伤在30°~60°内均有对合情况,对合最多的角度为40°,在<30°屈曲角度扫描中仅发现1例软骨损伤对合的病例。结论膝关节屈曲30°~60°时髌骨软骨与股骨滑车软骨损伤在对应面出现的频率最高。屈曲<30°时髌骨软骨与股骨滑车软骨损伤在对应面出现的频率较低。
Objective To observe the position of knee joint patellofemoral articular cartilage injury by multi-angle flexion MR scan of knee joint and to determine the most likely angle of motion of patellofemoral joint cartilage to explore the safe movement mode of knee joint. Methods Twenty-two patients with osteoarthritis were examined by rapid spin echo proton-weighted imaging at flexion and passive flexion at 0 °, 10 °, 20 °, 30 °, 40 °, 50 ° and 60 ° Plus fat suppression sequence (PD-TSE-FS) scan, sagittal images were observed patellofemoral articular cartilage injury. Results There were 4 abnormal T2WI signals in patellofemoral articular cartilage, 20 localized cartilage defects and 12 defects in articular cartilage. When the knee was flexed flexibly, the cartilage injury was matched within 30 ° ~ 60 °. The maximal angle was 40 °. Only 1 case of cartilage injury was found in <30 ° flexion angle scan. Conclusions The cartilage damage of the patella cartilage and the femoral cartilage in the flexion of knee joint from 30 ° to 60 ° has the highest frequency at the corresponding surface. The flexion <30 ° patella cartilage and femoral cartilage injury in the corresponding surface of the lower frequency of occurrence.