骨梗死的MRI诊断

MR imaging of the bone infarct

目的:探讨骨梗死的MRI表现。方法:回顾分析5例经MRI诊断的骨梗死,均由临床和手术证实。其中3例行X线检查未见明显异常后行MRI检查。结果:5例行MRI检查的骨梗死中共累及9个部位的骨骼,股骨下段5个,胫骨上段4个。MR上均呈“地图板块”样改变,T1wI上中心呈等骨髓信号,边缘呈花边样低信号,T2wI上中心呈等高混杂信号,边缘呈内高外低的2层信号者7个,呈花边样高信号者2个。结论:MRI是检查诊断骨梗死最佳方法,可以发现早期病变,明显优于X线检查。

Objective To study MRI manifestation of the bone infarct. Methods Characteristic MR findings in 5 patients with bone infarct were retrospectively analyzed. Five cases were all confirmed by operation or clinic. In 3 cases performed radiography before MRI had no obvious abnormity. Results Nine sites of the bone infarct in 5 patients were found, including 5 in the distal femur, 4 in the proximal tibia. All MR manifestation was 'map-shaped' lesions with moderate signal intensity on TIWI and inhomogenous high signal intensity on T2WI in the centers of the foci. Its margin was rugged an rough bands which was low signal intensity on TIWI and two layers (7 sites) or one layers (2 sites) on T2WI. Conclusion MRI is the most effective way to examine and find the bone infarct in the early stages. MRI is a better method to make the correct diagnosis than X-ray.