The pool is the only thing that works for me and if its not warm enough I use the kiddy pool its warmer, hot tub too. I suggest using support socks for swelling if he can handle the pressure. It actually helped relieve the pain some when my veins hurt or I have deep aching too. I get the ones with the least compression. I also have some that go all the way up to thighs when walking is difficult from leg pain. Use no ice. I use cold refrigerator packs for swelling or sweating and heat too for spine pain. Fire and ice. Strange disease.