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 DID YOU KNOW? Movement nourishes your joints by stimulating synovial fluidyour body's natural joint lubricant. Just 2030 minutes of walking daily can make a big difference in your joint health, mobility, and Osteoarthritis Nature Reviews Disease Primers Fluid Lubricates Joints Biological Strategy AskNature How to Increase Lubrication and Synovial Fluid in Your Knee Joint The Role of Lubricin, Irisin and Exercise in the Prevention and Treatment of Osteoarthritis