Natural Knee Lubrication for Healthy Cartilage and Joint Comfort London Cartilage Clinic Diagram of the presence of lubricin in the SF of the healthy knee joint Download Scientific Diagram Knee Osteoarthritis Knee Osteoarthritis: Early Signs, Causes, Diagnosis, Treatment A gel injection for the knee helps improve joint lubrication when natural synovial fluid becomes thinner or less effective, which often happens with arthritis., This gel acts as a cushion and