Association Between Musculoskeletal Pain and Frailty Over Time in Older Adults.

ABSTRACT

BACKGROUND AND PURPOSE: There is a high frequency of frailty in patients with musculoskeletal pain. Pain from osteoarthritis and lower back pain may be associated with frailty. However, the future risk of frailty among older adults with pain remains unclear. Thus, the primary objective of this study was to examine the association between musculoskeletal pain and the risk of becoming prefrail and frail in older adults. PARTICIPANTS AND METHODS: A secondary analysis was performed using data from baseline and 1-, 2-, 3-, 4-, 6-, and 8-year follow-ups of the Osteoarthritis Initiative (OAI). The OAI recruited participants from 4 clinical sites in the United States, between February 2004 and May 2006. A self-reported questionnaire was used to determine the baseline musculoskeletal pain status in older adults (n = 1780) 65 years and older, including pain in the lower back, hip, knee, and at 2 or more sites. Using the Fried phenotypic criteria, participants were classified as nonfrail, prefrail, and frail at each period over 8 years. RESULTS: After adjusting for age, sex, race, education, marital status, annual income, smoking status, comorbidities, and body mass index, binary logistic regression modeling using generalized estimating equations revealed that in older adults musculoskeletal pain in the lower back and at multiple sites was associated with a slightly but significantly decreased risk of prefrailty over time (adjusted odds ratio [AOR] = 0.98, 95% CI = 0.95-0.99, P = .019; AOR = 0.96, CI = 0.92-0.99, P = .032). The association between musculoskeletal pain and frailty among older adults was not statistically significant (all P > .05). CONCLUSIONS: Musculoskeletal pain did not independently significantly increase the risk of prefrailty or frailty over time. It remains possible that when musculoskeletal is combined with other factors, the risk of prefrailty and frailty may be heightened. Further research into the combination of characteristics that best predict prefrailty and frailty, including but not limited to musculoskeletal pain, is warranted.