Yao L, Lee J K
Department of Radiology, Albany Medical Center Hospital, NY 12208.
Radiology. 1988 Jun;167(3):749-51. doi: 10.1148/radiology.167.3.3363134.
Magnetic resonance (MR) images were retrospectively evaluated in eight patients who had recent, symptomatic knee injuries and in whom plain radiographs showed no fractures. T2-weighted images revealed irregular, intraosseous areas of high signal intensity; T1-weighted and proton density images revealed speckled or linear regions of low signal intensity in corresponding areas. In the seven patients whose injuries did not result from direct contusion, abnormalities occurred in subchondral locations. Two patients underwent bone scintigraphy, which showed increased activity in locations corresponding to areas of abnormality noted on MR images. Two patients underwent follow-up MR imaging at 6 weeks and 3 months, which showed complete resolution of the abnormalities. The authors speculate that the MR imaging findings represent microscopic compression fracture of trabecular bone and discuss the related entity, stress fracture.
对8例近期有膝关节症状性损伤且X线平片未显示骨折的患者的磁共振（MR）图像进行了回顾性评估。T2加权图像显示骨内不规则的高信号区域；T1加权和质子密度图像显示相应区域有散在或线性低信号区域。在7例损伤并非直接挫伤所致的患者中，软骨下部位出现异常。2例患者接受了骨闪烁显像，结果显示与MR图像上异常区域相对应的部位活性增加。2例患者在6周和3个月时接受了随访MR成像，结果显示异常完全消失。作者推测MR成像表现代表小梁骨的微观压缩骨折，并讨论了相关的实体——应力性骨折。
