MRI在距骨骨软骨损伤中的应用进展

Application progress on MRI of osteochondral lesions of the talus

距骨骨软骨损伤（osteochondral lesions of the talus,OLT）在临床上较为常见,往往引发关节疼痛、积液肿胀,导致关节功能障碍,严重者可致残。OLT好发于20~30岁之间的男性,约10%的患者双侧发病。OLT一般发生在距骨穹隆中部的内侧缘与外侧缘,并且前者损伤的范围、程度均比后者严重。常规X线、CT均不能直观地检查软骨,更不易判断其损伤的范围和程度,

Osteochondral lesions of the talus are common, but the scope and depth of the injury are difficult to be determined by conventional X-ray and CT scan. Lesions can be directly observed under the arthroscope, but it is invasive. MRI has excellent contrast to soft tissues, not only can display the cartilage in the non-invasive condition, but also provide imaging diagnosis and classification for cartilage damage. In addition to spin echo and gradient echo, many new MRI techniques have been applied for articular cartilage examination, such as delayed gadolinium enhanced magnetic resonance imaging, T_（1ρ） and T_2 mapping, and more options are provided for the examination and evaluation of the early damage of the articular cartilage.