A partial nephrectomy does not remove your kidney, it only removes the tumor / growth and whatever portion of kidney it involves. Then they repair it. Robitically is less invasive and not every surgeon is trained how to do this. If he does 20 a year that is one every two or three weeks... which is a good number. You can do a search of his patient reviews sometimes as well. I have had that surgery 2 times, one on each kidney and both are functioning. I am praying that you feel comfort in your decision