Building on previous work
The OARSI Task Force initiative will build on the early OA work by Stefan Lohmander, MD, PhD, and Frank Luyten, MD, PhD, who were part of a consensus panel that proposed draft classification criteria a few years ago. Those criteria, derived from a consensus workshop that had included basic scientists, physician-scientists, rheumatologists, orthopedic surgeons, and physiotherapists, identified three main areas of importance: Patient symptoms such as pain and function, the presence of crepitus or tender joints on clinical examination, and having a low Kellgren and Lawrence grade (0 or 1).
Dr. Lohmander remains heavily involved, heading up the advisory committee, with many other ad hoc committees likely to be set up during the project.
“We had over 70 people in the OARSI community volunteering to participate in some way, shape, or form,” Dr. Hawker said. All will be needed, she said, as there will be a lot of work to do. The starting point is people with undifferentiated knee symptoms, identifying the factors that increase or decrease the likelihood of having early-stage OA. Once a population has been found, the outcomes for prevention need to be defined.
A systematic search of the available literature has started and full-text review of more than 200 papers is in progress. The challenge ahead is to define what the ‘anchor question’ will be. That is, what question should be asked in order to determine whether a patient fulfills the criteria?
Dr. Hawker noted that when the American College of Rheumatology developed the RA classification criteria, the anchor question had been around whether methotrexate should be prescribed.
“We don’t have a ‘methotrexate’ in osteoarthritis, and it’s pretty low risk to start weight management or physical activity or even prescribe a topical anti-inflammatory,” she said. “So, we’re still trying to work out exactly how we create our anchor.”
It’s likely that the anchor question will be based on expert opinion rather than hard data. Perhaps it will focus on the chances that a patient’s symptoms will become persistent with loss of function or that they will develop established OA. It could perhaps be around the initiation of a novel DMOAD, if one proved effective enough to be used.
“We have many, many, many, questions!” Dr. Hawker said. One of the important ones is deciding what exactly should be prevented. Symptoms? Structural damage?
“I think a combination of symptoms and loss of function are probably what we want to prevent. But again, we’re going to have to define that very clearly. This is going to take us quite a bit of time.”
It’s likely to be a two-stage process: “First we define what is early stage OA, and then we identify those who are at the highest risk of rapid progression so that we can target those individuals for clinical trials.”
Dr. Hawker and Dr. Englund had no conflicts of interest to disclose.