Cartilage protects the joints by holding large amounts of water inside a thick, gel like material. This material is packed with natural molecules that pull in water and keep it in place. When a joint carries weight, the water inside the cartilage spreads out and softens the impact. This prevents the bones from pressing directly against each other and keeps movement smooth and comfortable. When pressure increases, the water rich layer pushes back and resists being squeezed. As soon as the pressur