Knee JointKneeHipHip JointOsteoarthritis, KneeArthroplasty, Replacement, KneeKnee InjuriesRange of Motion, ArticularKnee ProsthesisIsometric ContractionArthroplasty, Replacement, HipMuscle StrengthMuscle Strength DynamometerOsteoarthritis, HipHip FracturesHip ProsthesisTorqueQuadriceps MuscleBiomechanical PhenomenaMuscle, SkeletalLegContractureElectromyographyWeight LiftingMovementMuscle ContractionWeight-BearingGaitAnterior Cruciate LigamentHip Dislocation, CongenitalHip DislocationResistance TrainingMuscle FatigueExerciseThighHip InjuriesArthrometry, ArticularMuscle WeaknessHemiplegiaWalkingPatellaAnkle JointFemoral NervePhysical EnduranceRecovery of FunctionMuscle SpasticityTendonsTennisPatellar LigamentTreatment OutcomeBracesPatellofemoral Pain SyndromePhysical ExertionHand StrengthExercise TherapyPhysical Therapy ModalitiesMuscle Stretching ExercisesGait Disorders, NeurologicPhysical Education and TrainingProsthesis FailureKnee DislocationTime FactorsPostureArthralgiaTibiaProprioceptionMusclesLower ExtremityAnalysis of VarianceProsthesis DesignJoint InstabilityCerebral PalsyPostural BalanceJoint DiseasesReoperationCartilage, ArticularMedial Collateral Ligament, KneeOsteoarthritisAnkleMenisci, TibialArthroscopyPhysical FitnessRegional Blood FlowElectric Stimulation TherapyFemoral ArteryPain MeasurementExercise TestReproducibility of ResultsBone MalalignmentMagnetic Resonance ImagingProspective StudiesOxygen ConsumptionRunningActivities of Daily LivingPainAcetabulumHip Dysplasia, CanineAgingFemur HeadLigaments, Articular