I know some of you will pooh-pooh this, but my chronic tennis elbow got 95% better when I started taking glucosamine 1500 mg on a daily basis. I probably took it for a couple of months before I noticed a big difference. After having symptoms for years of pain, not being able to pick up things, etc, the glucosamine is the only change I made. If I abuse my elbows they will still hurt for a day, but they recover quickly.
The studies are always contradicting each other, I know, but it is definitely proven to help in animals, and we are animals after all.