 [ Symptoms ] any ideas on whats causing my knee replacement to hurt so bad read below i am 6 months recovering from knee replacement and my knee is worse now than before surgery it buckles very unstable shooting pains swelling the more i stay on it worse it gets its is a zimmer flex lps gender specific any ideas i have currently made a second opinion appointment as my current doctor says xrays are fine and he does 75 to 100 a year and i should take all my records and go see someone else so any imput will help [ Disease ] after age of 35 its possible to start having irregular period also make sure urine is not diluted and you are waiting enough time for test results