I have psoriatic arthritis. Currently I’m managing it very well with medication, but a number of years back I had a flare up in my right thumb on the first joint. I couldn’t bend my thumb for nearly half a year, and it was swollen and all messed up. The joint was permanently damaged during that and hurts if I even put pressure on it. Slapping that joint up against the strings would be awwwwful. Anyone else have hand issues preventing them from exploring certain techniques, especially slap?