Knee JointKneeOsteoarthritis, KneeArthroplasty, Replacement, KneeKnee ProsthesisKnee InjuriesLimb BudsExtremitiesRange of Motion, ArticularLimb SalvageLimb Deformities, CongenitalKnee DislocationTibiaBiomechanical PhenomenaAnterior Cruciate LigamentPatellaPhantom LimbWeight-BearingMenisci, TibialMedial Collateral Ligament, KneeArthralgiaCartilage, ArticularLegJoint InstabilityGaitLower ExtremityArthroscopyOsteoarthritisBone MalalignmentHindlimbPain MeasurementPainQuadriceps MusclePosterior Cruciate LigamentLigaments, ArticularTreatment OutcomeAmputationRecovery of FunctionMuscle StrengthJoint DiseasesMuscle, SkeletalIschemiaProsthesis DesignMovementForelimbWalkingReoperationProsthesis FailureJoint Deformities, AcquiredTorqueFollow-Up StudiesMagnetic Resonance ImagingSeverity of Illness IndexElectromyographyTime FactorsArthrometry, ArticularAnkle JointArmAmputeesOsteophyteProspective StudiesSynovitisTourniquetsPostureProprioceptionThighPatellar LigamentPatellofemoral JointPostoperative ComplicationsLoop of HenleSynovial FluidContractureTendonsHemarthrosisProsthesis-Related InfectionsArthroplasty, Replacement, HipHipUpper ExtremityRetrospective StudiesLocomotionReconstructive Surgical ProceduresAthletic InjuriesCartilageLeg InjuriesRotationShoesAnterior Cruciate Ligament ReconstructionArthrographyOrthopedic ProceduresExercise TherapyOrthotic DevicesSynovial MembraneIsometric ContractionPopliteal CystReproducibility of ResultsMotion Therapy, Continuous PassiveAmbystoma mexicanumPopliteal ArteryMuscle WeaknessSurgery, Computer-Assisted