I have arthritis in my right thumb and had a carpometacarpal joint arthroplasty. It took a while to heal from the surgery, I played my Camac DHC 32 electric harp while healing since it has very light tension. I am now playing my pedal harp again. I have to pace myself, cannot practice too long, about an hour and 15 minutes. Before and after surgery I used arnica cream, it is the best and safest (no ibuprofen or aspirin in the cream). I found that braces did not work well for me. The paraffin bath and a soak in hot water with Epsom salts helps. Also, icing for a couple of minutes right after you play.