Joint pain is not always just about the space where your bones meet up. Overall bone health can make a difference in your pain levels, too. Milk contains a nice amount of calcium to strengthen bones and help them maintain a healthy density. Studies have indicated that drinking milk may be able to slow the progression of osteoarthritis and even prevent gout completely.
But, if you have a dietary sensitivity to dairy, milk will more likely exacerbate your knee and joint pain rather than soothe it. In that case, try to eat more green leafy veggies and nuts to make up the difference in calcium.