PatellaCartilage, ArticularCartilageKnee JointOsteoarthritis, KneeCartilage DiseasesKneeMagnetic Resonance ImagingChondromalacia PatellaeQuadriceps MuscleTibiaFemurPatellar LigamentPatellofemoral JointChondrocytesPatellar DislocationOsteoarthritisNasal CartilagesEar CartilageHyaline CartilageLaryngeal CartilagesProteoglycansCartilage Oligomeric Matrix ProteinCross-Sectional StudiesOsteochondritisNail-Patella SyndromeExerciseKnee InjuriesDislocationsBody Mass IndexFractures, CartilageArthroplasty, Replacement, KneeBiomechanical PhenomenaKnee ProsthesisAggrecansMatrilin ProteinsJoint InstabilityCollagen Type IIWeight-BearingRange of Motion, ArticularGlycosaminoglycansMenisci, TibialExtracellular Matrix ProteinsChondrogenesisJoint DiseasesProchloronArthralgiaArthroscopyStifleGrowth PlateCollagenCadaverPatellofemoral Pain SyndromeBone and BonesStress, MechanicalMedial Collateral Ligament, KneeNasal SeptumEpiphysesTendons