ChondrocytesBone Morphogenetic ProteinsOsteoarthritisBone Morphogenetic Protein 2Cartilage, ArticularBone Morphogenetic Protein 4Bone Morphogenetic Protein 7Matrix Metalloproteinase 13Osteoarthritis, KneeBone Morphogenetic Protein Receptors, Type IBone Morphogenetic Protein ReceptorsBone Morphogenetic Protein 6Bone Morphogenetic Protein Receptors, Type IIProcollagen N-EndopeptidaseBone and BonesCollagen Type IICells, CulturedBone Morphogenetic Protein 5Smad1 ProteinSmad ProteinsMatrix Metalloproteinase 3Bone Morphogenetic Protein 3Matrix Metalloproteinase 1Signal TransductionProteoglycansSmad5 ProteinInterleukin-1betaCollagenasesCartilageTransforming Growth Factor betaRNA, MessengerBone Morphogenetic Protein 15Bone Morphogenetic Protein 1Reverse Transcriptase Polymerase Chain ReactionGene ExpressionInterleukin-1Bone RemodelingSmad6 ProteinCell DifferentiationOsteogenesisSmad8 ProteinGene Expression RegulationOsteoblastsBone DevelopmentChondrogenesisGrowth Differentiation Factor 5Growth Differentiation Factor 2Bone DensityBone RegenerationAggrecansGrowth PlateReceptors, Growth FactorGene Expression Regulation, DevelopmentalGrowth Differentiation FactorsNitric OxideBone MatrixGrowth Differentiation Factor 9Intercellular Signaling Peptides and ProteinsKnee JointIn Situ HybridizationBone ResorptionAlkaline PhosphataseActivin Receptors, Type IGrowth Differentiation Factor 6Extracellular Matrix ProteinsActivinsSOX9 Transcription FactorSmad4 ProteinBone NeoplasmsCalcification, PhysiologicMesodermBone DiseasesBone Marrow CellsBone MarrowCore Binding Factor Alpha 1 SubunitActivin Receptors, Type IIBody PatterningImmunohistochemistryChick EmbryoSynovial MembraneFollistatinTibiaSmad Proteins, Receptor-RegulatedCollagenCarrier ProteinsCartilage DiseasesActivin ReceptorsCollagen Type XInhibitor of Differentiation Protein 1ProteinsOssification, HeterotopicTrans-ActivatorsExtracellular MatrixFemurHedgehog ProteinsCell ProliferationMesenchymal Stromal CellsTolloid-Like MetalloproteinasesBone TransplantationMSX1 Transcription Factor