Are you doing any formal strength training/going to the gym? Skiin is hard! I had hip replaced in January, have been using a trainer twice a week since March and am in my best condition, especially core, in over 5 years (I'm 65). After work out, everything hurts except my hip for 24-48 hrs but I can ski pain free again and have no limitations after surgery. My buddy has had both knees done, he skis pain free and works out regularly.