In reply to gache:
I had carpal tunnel surgery after I had been climbing regularly for about 18 months, so nothing like as drastic as the procedures you mention. Didn't climb for 6 weeks then went back to it very carefully. I had pain in my wrist whilst climbing for many months afterwards, not directly at the site of the surgery but presumably highly related to it. I found that wearing a soft neoprene wrist support whilst climbing held everything in place a bit and kept the discomfort away. Other than that it was fine - the biggest thing to take a knock was actually my head for leading but fall practise can sort that!