It's not commonly known, but resveratrol is turning out in a lot of very recent research to be a miracle substance for joints. Including the spine. I could post the references if people want. This requires larger doses than a lot of supplements that are sold as resveratrol can deliver. The best way to take it is to buy the 50% trans-resveratrol powder that is made from Japanese knotweed, from a reliable source, and take it buccally, in your cheek. Then it absorbs into your bloodstream. It doesn't taste bad, its a little gritty.
It really works, not just for joint pain, it helps a great many medical conditions and may even extend life span. There is solid science behind it. Right now its perhaps the most studied natural substance.
I don't know why the medical profession doesn't read more about this stuff. What the hell are they thinking, ya know?
Also, DLPA "DL-phenylalanine" an amino acid, (taken in the morning/afternoon, not in the evening, or it could interfere with tryptophan transport) is not analgesic, but it potentiates your body's own analgesic, endorphins, by slowing its rate of metabolism. It also - because its half L-PA, is energizing. Yes, a paradox.
A lot of the time I suspect in bikers joint pain may be an garden variety infection that has never been treated adequately. Thats just a hunch.