Magnetic therapy for horse arthritis?

Cold weather is coming and my horse suffers from mild - moderate arthritis in his hocks and sometimes stifle I suspect, during the coldest weather.

I am very conscientious about caring for him correctly during cold weather (supplements, turnout, lengthy warmups, liniment rubs etc etc)

Specifically, I want to know if you've had or are having great luck with magnetic therapy for arthritis?

If so, specifically which brands and items are you using? I see Back On Track items, but they look expensive and I think the old-school ranch cowboys at my barn will giggle at me with magnetic wraps...

I'm willing to suffer that if they really do work well.