Open AccessBiomarkers of incident radiographic knee osteoarthritis: Do they vary by chronic knee symptoms?
Author(s) -
Golightly Yvonne M.,
Marshall Stephen W.,
Kraus Virginia B.,
Renner Jordan B.,
Villaveces Andrés,
Casteel Carri,
Jordan Joanne M.
Publication year - 2011
Publication title -
arthritis & rheumatism
Language(s) - English
Resource type - Journals
eISSN - 1529-0131
pISSN - 0004-3591
DOI - 10.1002/art.30412
Subject(s) - medicine , osteoarthritis , hazard ratio , cartilage oligomeric matrix protein , confidence interval , body mass index , biomarker , proportional hazards model , cartilage damage , knee joint , keratan sulfate , cartilage , surgery , articular cartilage , pathology , biochemistry , chemistry , alternative medicine , proteoglycan , anatomy
Objective To explore the ability of osteoarthritis (OA)–related biomarkers to predict incident radiographic knee OA in a large sample of African American and Caucasian men and women. Methods Baseline levels of serum cartilage oligomeric matrix protein (COMP), hyaluronan (HA), high‐sensitivity C‐reactive protein (hsCRP), and keratan sulfate (KS) and baseline and followup radiographs were available for 353 knees without baseline osteophyte formation and for 446 knees without baseline joint space narrowing (JSN). Cox models estimated the hazard ratio (HR) and 95% confidence interval (95% CI) for incident knee OA for a 1‐unit increase in the ln of each biomarker, with adjustment for age, race, sex, body mass index, and knee OA of the contralateral limb. Report of chronic knee symptoms was explored as a modifier of the association. Results The hazard of incident knee osteophytes (HR 2.16 [95% CI 1.39–3.37]) and incident JSN (HR 1.82 [95% CI 1.15–2.89]) increased with higher baseline ln(COMP) levels. The hazard of incident knee JSN increased with higher ln(HA) levels (HR 1.46 [95% CI 1.14–1.87]). Baseline ln(hsCRP) and ln(KS) did not predict incident knee outcomes. HRs per unit increase in ln(COMP), ln(HA), and ln(KS) were higher among knees with chronic symptoms than among those without symptoms. Conclusion Higher baseline ln(COMP) and ln(HA) levels were associated with incident knee OA over an average followup period of 6.3 years. These results represent detection of a molecular stage of OA prior to radiographic manifestations. Further exploration is needed to determine how chronic knee symptoms modify the biomarker–incident knee OA association.