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MRIImagingofCartilageinjuryZoneofcartilageZoneofcartilagenormalgray-scalestratificationoftheremainingmedialfemoralcondyleandtibialplateauLaysofcartilageRechtcclassificationThecartilageblacklinesign:anunexpectedMRIappearanceofdeepcartilagefissuringThecartilageblacklinesign:anunexpectedMRIappearanceofdeepcartilagefissuringSagittal(A)andcoronal(B)fastspin-echoMRimagesofthekneeina24-year-oldprofessionalfootballplayer.Thereishyperintensityintheradialzone,indicatingdeepsurfacedelamination(arrow),adjacenttothetidemarkwithnoflapformation.Thereisalsoassociatedsclerosisofthesubchondralplate.ThepatientunderwentmicrofracturewithagoodclinicaloutcomeSodiumMRIfindsearlysignsofarthritisdisplacedosteochondralfragmentAT1-weightedsagittalexamdemonstratesanosteochondralinjury(arrow)alongtheanteriorweight-bearingsurfaceofthemedialfemoralcondyle.aprotondensityweighedfastspin-echoaxialimagewithfat-suppression,afluidfilled"crater"(arrow)isapparentwithinthelateralcompartmentposteriorlyAfat-suppressedfastspin-echoprotondensityweightedcoronalimagerevealsanill-definedcartilagedefect(arrow)alongtheweight-bearingsurfaceofthelateralfemoralcondyleDisplacedchondralfragmentlateralpatellarmaltrackinganditseffectsonchondralwearnarrowingofjointspaceFollow-upFollow-upFollow-upOsteochondritisDissecansUnstableOsteochondritisDissecansoftheMedialfemoralCondyleAprotondensity-weightedfat-suppressedcoronalimagedemonstratesafluidsignal-intensityline(arrows)atthebaseoftheosteochondrallesionofthemedialfemoralcondyle,compatiblewithunstableOCDAfat-suppressedprotondensity-weightedcoronalimageoftheankleshowsfluidextendingthroughthechondralandcorticalsurface(arrowhead)ofanosteochondrallesionofthelateraltalardomeSTIRcoronalandsagittalT2imagesofthemedialfemoralcondylerevealafocalarticulardefect(arrows)Afat-suppressedT2-weightedsagittalimageoftheankleshowsaninvertedosteochondralfragment(arrow).Thearticularsurfaceisfacinginferiorly(dottedline)inthisclearlyunstablelesion.6weeksand20monthsafterautologouschondrocyteimplantat
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