In this Wednesday, March 5, 2014 file photo, a doctor holds a model of a tri-compartmental total knee replacement in Chicago. In a commentary by published by the New England Journal of Medicine on Wednesday, Oct. 21, 2015, Dr. Jeffrey Katz, a joint specialist at Brigham and Women’s Hospital in Boston, says people with knees worn out by arthritis will get more pain relief from joint replacement surgery, but it has more risks and there’s a good chance that less drastic approaches also would help.