应力性骨折的早期低场强MRI与DR诊断分析

目的：通过对应力性骨折的DR与低场强MRI表现的对比,及分析应力性骨折的解剖学和生物力学特征,提高对应力性骨折早期的低场强MRI诊断的准确性。方法：回顾性分析经临床随访或病理证实29例不同部位应力骨折患者的MRI及DR图像。结果：29例中,胫骨12例（中上段为主）,股骨下段3例,胫骨上段和股骨下段同时发病3例,髂骨、耻骨、坐骨及股骨头颈部、股骨上段各2例,跖骨2例,腓骨中上段2例。MRI均可见骨髓腔内斑片状不均匀长T1、长T2水肿信号,范围远较DR片广泛,边界模糊;7例骨皮质周围见环形或半环形长T1、长T2骨膜水肿信号;6例可见隐匿骨折线;冠、矢状位表现为髓腔内斜形或横形线条状长T1、短T2信号影,其中骨皮质中断4例;10例可见骨皮质增厚,呈长T1、短T2信号;软组织肿胀呈弥漫性长T1、长T2信号。结论：MRI能够更敏感地发现早期应力性骨折,为诊断和判断骨折愈合情况提供更多信息。

MRI and DR findings in the diagnosis of stress fracture

Objective:To improve MR diagnosis of stress fracture by analyzing its the features of anatomy and biomechanics and MR imaging findings.Methods:MR imaging findings in 29 cases with stress fractures confirmed by follow-up and pathology results were retrospectively analyzed.Results:There are 12 cases of tibia stress fracture in all cases.Patchy low intensity on T1WI and higher intensity on T2WI edema signal could be seen in bone canal with wider range and unclear board.Circular or semicircular periosteum edema...