Arthroplasty, SubchondralFractures, CartilageRadiation, NonionizingHyaline CartilageCartilage, ArticularArthroscopyPlatelet-Rich PlasmaCartilage DiseasesKnee InjuriesKnee JointChondrocytesWound HealingGoatsCollagen Type IIInjections, IntralesionalSurgical Procedures, Minimally InvasiveMagnetic Resonance ImagingTreatment OutcomeDisease Models, Animal