Orthopedician for Knee replacement surgery infection

My grandfather had knee replacement surgery 4 months ago in a hospital in vizag (I don't want to disclose name). But after a month, knee got infected. The doctor blamed us for that and prescribed another surgery to rectify it. Right now, the knee got infected again and he is saying that another surgery is required. Both our family and my grandfather are tired mentally and physically in this entire 4 months. So please suggest me some authentic orthopaedician to consult in vizag.....if anyone has similar experience, feel free to share.