RTKR on Jan. 25th. Staples out, incision healing but very tender. Icing and elevating. PT 2x weekly. Flexion 93 degrees, extension -4. My question: I have a Far Infrared Sauna here at the house which I used several times a week prior to surgery. Any knowledge or recommendations about using it at this point in my recovery? I can adjust the heat so it is just a bit warm, not hot.