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Background/Purpose: Mechanistic insight into osteoarthritis fatigue is needed as clinical management of this condition is nonspecific. Systemic inflammation is associated with fatigue in other chronic diseases. The purpose of this study was to explore the relationship between systemic inflammation and fatigue in osteoarthritis, while controlling for covariates. Method: This secondary analysis with a cross-sectional, multiyear retrospective design used data from the 2007−2010 National Health and Nutrition Examination Survey. Adults with self-reported osteoarthritis who participated in an examination at a mobile center and had no comorbidities associated with fatigue or systemic inflammation were included ( n = 296). Complex sample analysis, independent samples t tests, and χ2 tests of independence were used to explore differences between nonfatigued and fatigued adults with osteoarthritis. Adjusted hierarchical logistic regression models were used to calculate odds of fatigue as a function of two systemic inflammatory markers, C-reactive protein (CRP), and white blood cell (WBC) count. Results: Fatigued adults with osteoarthritis had significantly higher CRP levels and WBC counts compared to nonfatigued adults with osteoarthritis. In adjusted logistic regression models, increased CRP was associated with higher odds of fatigue when controlling for age, days affected by pain, depressive symptoms, sleep quantity, and body mass index (Odds ratio [ OR] = 3.38, 95% CI [1.18, 9.69]). WBC count was not associated with higher odds of fatigue when controlling for these variables ( OR = 1.10, 95% CI [0.92, 1.32]). Conclusion: Systemic inflammation may have a relationship with fatigue in osteoarthritis. Future work is necessary to replicate these findings in more robust studies.

Background and PurposeLimited literature exists regarding the psychometric properties of the Patient-Reported Outcome Measurement Information System (PROMIS) Fatigue Short Form 8a. This study compared the psychometric properties of the 8a to the established PROMIS Fatigue Short Form 7a.MethodsThis was a cross-sectional study of 31 older adults with joint pain. Equivalent forms reliability and a Rasch analysis explored reliability (equivalent forms, internal consistency), validity (unidimensionality, item INFIT/OUTFIT), and additional psychometrics (item mapping).ResultsThe measures were equivalent in measuring fatigue (r = 0.75, p < .001) with good internal consistency (α = .87−.92). Both were unidimensional. Even though the 8a had better fitting items, neither measure could differentiate low levels of fatigue.ConclusionThe 8a has comparable psychometric properties to the 7a in this population. Future work is needed in larger, more diverse samples.