Gel Injections for Bone on Bone Knees Joint Relief Institute Joint Relief Institute Viscosupplementation: How Gel Injections Restore Your Knee's Natural Cushioning Joint Relief Institute Joint movement depends on synovial fluid, a slippery liquid that reduces friction and nourishes cartilage. This fluid is constantly renewed through joint movement and adequate water availability. When hydration is reduced, synovial Flexcin Motion Lotion with CM8 All Natural Joint Pain Relief Lotion Flexcin International, Inc.