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Ann Rheum Dis. 2013 Apr;72(4):535-40. doi: 10.1136/annrheumdis-2011-201047. Epub 2012 May 12.

Associations between serum levels of inflammatory markers and change in knee pain over 5 years in older adults: a prospective cohort study.

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1
Menzies Research Institute, Private Bag 23, Hobart, Tasmania 7000, Australia.

Abstract

OBJECTIVE:

To determine the association between inflammatory markers and change in knee pain over 5 years.

METHODS:

A total of 149 randomly selected subjects (mean 63 years, range 52-78; 46% female) was studied. Serum levels of high sensitivity C-reactive protein (hs-CRP), tumour necrosis factor alpha (TNF-α) and interleukin (IL)-6 were measured at baseline and 2.7 years later. Knee pain was recorded using the Western Ontario and McMasters osteoarthritis index questionnaire at baseline and 5 years later. Knee radiographic osteoarthritis of both knees was assessed at baseline, and knee bone marrow lesions, joint effusion and cartilage defects were determined using T1 or T2-weighted fat saturated MRI.

RESULTS:

After adjustment for confounding variables, baseline hs-CRP was positively associated with change in total knee pain (β=0.33 per mg/l, p=0.032), as well as change in the pain at night in bed (β=0.12 per ml/pg, p=0.010) and while sitting/lying (β=0.12 per ml/pg, p=0.002). Change in hs-CRP was also associated with change in knee pain at night and when sitting/lying (both p<0.05). Baseline TNFα and IL-6 were associated with change in pain while standing (β=0.06 per ml/pg, p=0.033; β=0.16 per ml/pg, p=0.035, respectively), and change in TNFα was positively associated with change in total knee pain (β=0.66 ml/pg, p=0.020) and change in pain while standing (β=0.26 ml/pg, p=0.002). Adjustment for radiographic osteoarthritis or MRI-detected structural abnormalities led to no or minor attenuation of these associations.

CONCLUSION:

Systemic inflammation is an independent predictor of worsening knee pain over 5 years.

PMID:
22580582
DOI:
10.1136/annrheumdis-2011-201047
[Indexed for MEDLINE]
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