Joints move smoothly because their surfaces are coated with synovial fluid. This fluid acts as a lubricant and shock absorber. It is mostly water, mixed with proteins that reduce friction., When Weld On Seal Lube Gasket Lubricant for Joints Weld On Adhesives, Inc. Lubrication of articular cartilage Physics Today INFOGRAPHIC: Don't Let the Heat Dehydrate You Ortho Rhode Island Most people associate hydration with skin, digestion, or energy levels., But one of the most overlooked systems affected by hydration is your joints., Inside every joint is a specialized lubricant