Joint pain, especially in the knees, is a common complaint in older patients and can impact quality of life. A team of researchers recently set out to examine how often knee pain is accompanied by pain elsewhere in the body and whether the presence of multiple joint pain affects older patients' general health and psychological status.
Their findings, published in the August 2005 issue of Arthritis & Rheumatism, indicate that most people with knee pain also have pain at other sites and these patients tend to have more limited physical function and suffer more from depression and anxiety.
Led by Peter Croft of Keele University in Keele, UK, the authors surveyed a total of 5,364 patients aged 50 years or older who were registered with 3 general practices in North Staffordshire, UK. Each participant completed a questionnaire that included a body manikin on which they shaded any areas where they had experienced pain for one or more days during the last month. Pain was categorized into regions, which included: knee, neck, hand, lower back, hip, and foot and ankle. Based on where the pain occurred, participants were then grouped into (i) those with no pain at all, (ii) those with knee pain, either alone or with pain in 1 or 2 or more locations elsewhere, (iii) those with no knee pain but with pain in 1, 2 or 3 or more locations other than the knee.
A standard health survey used to determine the influence of pain elsewhere on general health was also completed, as well as an index to measure pain and disability specifically related to the knee. Obesity, anxiety and depression, all of which are linked to widespread pain, were also measured using various scales.
Of those surveyed, slightly more than one-third (1,909) ended up in the no pain group, 41% (2,210) in the knee pain group, and 23% (1,245) in the pain elsewhere group. Decreased physical function increased with the number of pains in the body, both in the knee and elsewhere. In those with at least 3 pain regions, the subgroup that included knee pain had worse physical function. This group was also more likely to be depressed than either those with no pain at all or those who had pain in a location other than the knee, even if it was in 3 or more regions.