Sinding-Larsen-Johansson disease, also known as Sinding-Larsen disease or Larsen-Johansson syndrome, affects the proximal end of the patellar tendon as it ...×ArticlesLogInCasesSignUpCoursesQuizDonateAbout×MenuSearchADVERTISEMENT:Radiopaediaisfreethankstooursupportersandadvertisers.BecomeaGoldSupporterandseenoads.ArticlesCasesCoursesLogInLoginSignup{"url":"/signup-modal-props.json?lang=us\u0026email="}ArticlesCasesCoursesQuizAboutRecentEditsGoad-freeSearchADVERTISEMENT:Supportersseefewer/noadsSinding-Larsen-JohanssondiseaseDrHenryKnipe◉◈andAssocProfFrankGaillard◉◈etal.Sinding-Larsen-Johanssondisease,alsoknownasSinding-LarsendiseaseorLarsen-Johanssonsyndrome,affectstheproximalendofthepatellartendonasitinsertsintotheinferiorpoleofthepatella. Itrepresentsachronictractioninjuryoftheimmatureosteotendinousjunction.ItisacloselyrelatedconditiontoOsgood-Schlatterdisease.SomeauthorsclassifySinding-Larsen-Johanssondiseaseasapediatricversionof"jumper'sknee" 2.Onthispage:Article:EpidemiologyClinicalpresentationRadiographicfeaturesTreatmentandprognosisHistoryandetymologyDifferentialdiagnosisRelatedarticlesReferencesImages:CasesandfiguresImagingdifferentialdiagnosisEpidemiologyUnlike"jumper'sknee"whichisseenatanyage,Sinding-Larsen-Johanssondiseaseisseeninactiveadolescents,typicallybetween10-14yearsofage1.ChildrenwithcerebralpalsyarealsopronetoSinding-Larsen-Johansson4.ClinicalpresentationThepresentationiswithpointtendernessattheinferiorpoleofthepatellaassociatedwithfocalswellingandrestrictionofkneejointrangeofmovement8.ADVERTISEMENT:Supportersseefewer/noadsRadiographicfeaturesPlainradiographEarlyfindingsaresubtleorabsent.ThickeningoftheproximalpatellartendonmaybeseenwithpossiblestrandingoftheadjacentportionsofHoffa'sfatpad.Dystrophiccalcification and/orossificationmayeventuallyoccur.Ultrasoundthickeningandheterogeneityoftheproximalpatellartendon,especiallyinvolvingtheposteriorfibers(whichattachtothepatellaratherthanpassoverthesurfaceofthepatellatoblendwiththequadricepstendon)focal