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Knee Pain Health Center

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Emotions May Influence Arthritis Pain

Study Shows Fear, Distress Can Affect Patients' Perception of Pain
WebMD Health News
Reviewed by Louise Chang, MD

March 28, 2007 -- The fear and distress arthritis patients feel about their condition can make a big difference in how they perceive the pain that comes with it, a novel brain-imaging study shows.

The findings suggest that interventions designed to reduce pain-related fear and anxiety, such as behavioral therapy, should play a bigger role in the treatment of chronic arthritis pain, the study's researcher tells WebMD.

"Most arthritis patients don't have access to these types of therapies, or if they do, they tend to get them after they have lived with pain for many years," says neuro-rheumatologist Anthony K.P. Jones, MD. "We believe patients would fare better if they were treated with these therapies much earlier."

The Pain Systems

The study by Jones and colleagues from the University of Manchester Rheumatic Diseases Center is the first to directly examine how the brain processes arthritis pain using a specific type of brain imaging.

Two parallel areas within the brain have been identified as pain processing centers -- the lateral system and the medial system.

While both systems share many of the same functions, earlier work by the University of Manchester research team identified the medial system as being more involved in the emotional aspects of pain, such as fear and stress.

The lateral system was found to be more involved in processing sensory aspects of pain, such as pain location and duration.

Studies involving healthy volunteers subjected to controlled pain made it clear that the way people think about their pain can change their perception of it, Jones says.

"That may sound obvious, but a lot of people with pain think they have no control over what they are feeling," he says. "The fact is that the brain rules in terms of pain perception."

In their latest study, the researchers attempted to determine if people with chronic pain respond in a similar way.

Six women and six men with knee osteoarthritis (OA) were recruited for the trial. Brain imaging was performed when the subjects were experiencing arthritis pain, when they were pain-free, and when they were experiencing controlled, heat-related pain to the arthritic knee administered by the researchers.

For all 12 patients, both types of pain activated both pain systems. But activity within the medial system was much greater when the patients were experiencing arthritis pain.

The findings suggest that for these patients, arthritis pain was more strongly associated with fear and distress than other types of pain. The study appears in the April issue of the journal Arthritis and Rheumatism.

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