低场MRI对早期股骨头缺血坏死诊断价值【摘要】目的:研究低场MRI对对早期股骨头缺血坏死的诊断价值和影像学表现。方法回顾性分析43例86个股骨头经临床证实股骨头坏死患者X线平片、CT及低场MRI检查资料,对其影像学改变进行分期及敏感性对照。结果86个股骨头X线平片正常38个,其中I期20个,表现为骨质疏松和骨硬化;II期28个,表现为骨硬化及囊状低密度区。CT表现正常21个,其中I期27个,表现为骨小梁星芒状结构消失,骨质疏松及骨硬化;II期38个,表现为骨硬化和囊状透亮区。低场MRI表现I期30个,表现为斑点状T1WI低信号;II期35个,表现为T1WI、T2WI序列上斑片状或不规则低、等、高混杂信号;III期21个,在T1WI、T2WI序列上呈片状低信号,并见高信号环绕。三者比较差异教大,意义显著。结论CT及低场MRI可早期显示ANFH病变,而低场MRI对ANFH的敏感性及找诊断价值高于X线平片及CT.【关键词】股骨头坏死;磁共振成像;体层摄影术;X线计算机TheValueofLowFieldMRIinDiagnosisofEarlyAvascularNecrosisofFemoralHeadWEILinLIGechangMENGJiayan[Abstract]ObjectiveTostudythefindingofearlyavascularnecrosisofthefemoralhead(ANFH)onlowfieldMRIandtheirdiangnosticsignificance.MethodsLowFieldMRIfindingsin43patientswith86ANFHprovedbypathologywereanalyzedretrospectivelyandomparedwithX-rayandCTfinding.RanksumHtestandsensitivitywerecompleted・ResultOnX-rayfilm,noabnormalityoffemoralheadwasvisiblein38places,stageIshowedasosteoporosisandosteosclerosisin20places,stageIIshowedasosteosclerosesandcystiformhyalineregionsin28places.OnCTimage,noabnormalityoffemoralheadwasvisiblein21places,stageIshowedasstelliformsigndistortion,osteosclerosesandosteoporosisin27places,stageIIshowedasosteosclerosesandcystifonnhyalineregionsin38places.OnLowFieldMRIstageIshowedasmottlinghypointensityonT1WIin30places,stageIIshowedaspatchyorirregularshapehypointensity,isointensity,hyperintensityandheterogeneousintensityonT1WIandT2WIin35places,stageIIIshowedaspatchyhypointensityonT1WIandT2WIin21places,theperipherywascircledwithhyperintenseband・RanksumHtestandsensitivitycomparwerestriking・ConclusionCTandLowFieldMRIcouldexactlydisplayearlyANFHSensitivityanddiagnosticvalueofLowFieldMRIissuperiortoCTandX-rayfilm.【Keywords】Femurheadnecrosis,Tomography,X-raycomputed,Magneticresonanceimaging【中图分类号】R425【文献标识码】B【文章编号】1005-0515(2011)07-0351-01股骨头缺血坏死是一种常见的骨关节病,临床发现典型ANFH大多已进入不可逆转的中晚期,往往失去最佳治疗时机,因此,早发现、早诊断、早治疗对提高患者生活质量意义重大。为能早期发现病变已成为当前研究的重点。本文通过X线平片、CT及低场MRI的影响学分析及对照研究,着重对低场MRI的表现进行探讨。1资料和方法1.1一般资料抽取我院2004年至2009年间,均经X线平片、CT及MRI检查并经病理或临床证实的股骨头坏死43例。其中男33例,女10例。年龄17-77岁。临床表现为患侧腹股沟或骯区,大腿内侧深在性刺痛,可放射至膝或臀部,疼痛可为间断或进行性加重,体检时屈曲、内收、外展及内旋功能受限。1.2检查方法全部患者均行双侧股骨头X线摄片、CT、MRI检查。采用西门子16层螺旋CT扫描仪扫描,进行层厚5mm,层间距5mm,窗宽2000HU,窗位600HU,距阵320X320的横断、冠状、矢状面重建。采用GEO.2T永磁开放型磁共振,选用体线圈,扫描序列:SE、TSE序列及STIR序列;扫描参数:SET1WITR300ms,TE15ms,TSET2WITR4480ms,TE108ms,STIRTR6145ms,TE108ms,TI118ms;层厚6mm,层间隔7mm;矩阵320X320.所有患者均常规行横断面和冠状面T1WI、T2WI及STIR序列成像。1.3影像学分期标准参照Ficat、Frobergy[l]Hungrford及Seteinberg分期法,采用六期分期标准。0期:临床及X线前期,MRI为正常黄骨髓信号;I期:X线平片示正常,CT示骨小梁“星芒结构”变形及斑片状骨质疏松和骨硬化,MRI示股...