 [ Symptoms ] i have had a left knee replacement using the zimmer flex lps and i have had nothing but pain in the knee and outside  the ortho said there is nothing wrong when he looked at my xray and said i should go for a second opinion this replacement was done 6mo ago dec 6th when going to the site for the brand of knee it has numerous issues posted by other patients any other input would be appreciated [ Disease ] i am sorry to hear you are going through this it must be frustrating to go through a major surgery and then continue to experience pain issues if your orthopedic surgeon suggested you get a second opinion i would advise you to do just that it is possible a different surgeon with different experience in joint replacement will be able to identify the source of your pain and treat it a number of conditions could cause the pain you describe if you have a fever 101f nausea or feeling like you might be coming down with the flu i would suggest you call your orthopedist as soon as possible as these may be signs of an infection otherwise i would suggest you get that second opinion i hope you find relief soon