Calcium PyrophosphateChondrocalcinosisMicroscopy, PolarizationCrystallizationDiphosphatesSynovial FluidGoutCalcium PhosphatesPhosphate Transport ProteinsUric AcidDelayed DiagnosisPyrophosphatasesPrenatal DiagnosisKnee JointEarly DiagnosisCartilage, ArticularDurapatiteSensitivity and SpecificityDiagnosisOsteoarthritisRetrospective StudiesChondrocytesDiagnostic ErrorsTomography, X-Ray ComputedNeutrophilsBiopsyNursing DiagnosisDiagnosis, Computer-AssistedPredictive Value of TestsReproducibility of ResultsPreimplantation DiagnosisProspective StudiesPrognosisTime FactorsMagnetic Resonance ImagingFollow-Up StudiesTreatment OutcomeRisk FactorsInfant, NewbornPregnancyPolymerase Chain ReactionFatal OutcomeBiopsy, NeedleFetal DiseasesCohort StudiesIncidence