7 Ways to Lubricate Joints Naturally for Less Pain Knee Joint Wear and Tear, Knee Joint Pain, Restoring Joint Lubrication Function Joint fluid fills the small space between the ends of bones and acts like a natural lubricant. The synovial membrane creates this thick, silky fluid using long molecules that hold water and give it a TKR Joint lubrication in an artificial knee joint Joint Replacement Patient Forum How to Increase Lubrication and Synovial Fluid in Your Knee Joint