Ok so Im 57 Green belt in Kempo In N.C due to stage 2 arthritis and recomendation that Ill soon need a partial knee replacement .So its over.Or is it? Been looking for others similiar experience and what are my options, How do you give something up thats so importan in ones life ? Aint easy ! Im thinking that I can modify my practice( Like jazz, Im into playing ) improvise. Go with Katas only? Doc told me I might use a cane so I thought " Cane kata" . I can develop one.. add some boxing( on heavy bag), Its been recommended I do yoga or Tai chi. . Wont do.. feedback? similiar experinces ?