Biomechanical PhenomenaKnee JointKneeOsteoarthritis, KneeArthroplasty, Replacement, KneeKnee ProsthesisKnee InjuriesRange of Motion, ArticularKnee DislocationTibiaPatellaAnterior Cruciate LigamentMenisci, TibialMedial Collateral Ligament, KneeArthralgiaCartilage, ArticularWeight-BearingReproducibility of ResultsJoint InstabilityGaitArthroscopyOsteoarthritisBone MalalignmentObserver VariationPain MeasurementPosterior Cruciate LigamentPainQuadriceps MuscleLigaments, ArticularGenetic VariationTreatment OutcomeHeart RateTime Factors