I have had my two knees repaired with partial knee replacements, one in February, 2016 and the second in February, 2017.........I had the prescribed rehab. in both cases and all seemed well until recently, beginning in late April, around April 25. All of a sudden, both knees started to stiffen and became very painful during walking or any other activity, especially when I attempt to get out of any chair at normal height. I have no trouble sleeping, since the Trazadone was prescribed by my physician to act as a non-symptom sleeping pill . I have researched the medication and realize that it was not intended to be a sleeping aid, but it is giving me fine results for that. I am considering visiting my doctor for Sync-Visc shots, but will first try Acetaminaphen and/or Ibroprofin . Your comments and recommendations would be appreciated.