When I do reverse curls I like to use an EZ bar. The straight barbell is too much pronation for me. But the EZ bar is just right.
I don't like to use the DB's for reverse curls as much. I guess they don't lock the hands into position the way the EZ bar does.
So maybe try the EZ bar for...
I think it depends on how long you been Lifting for already. When I was not lifting at all I had joint pain, and then once I built strength around those areas, the muscle seemed to support my joints, and I had less pain.
But once you already have really strong muscles it could be another kind...