Association of cartilage defects with loss of knee cartilage in healthy, middle-age adults: A prospective study
Article first published online: 28 JUN 2005
Copyright © 2005 by the American College of Rheumatology
Arthritis & Rheumatism
Volume 52, Issue 7, pages 2033–2039, July 2005
How to Cite
Cicuttini, F., Ding, C., Wluka, A., Davis, S., Ebeling, P. R. and Jones, G. (2005), Association of cartilage defects with loss of knee cartilage in healthy, middle-age adults: A prospective study. Arthritis & Rheumatism, 52: 2033–2039. doi: 10.1002/art.21148
- Issue published online: 28 JUN 2005
- Article first published online: 28 JUN 2005
- Manuscript Accepted: 6 APR 2005
- Manuscript Received: 26 MAY 2004
- Colonial Foundation
- Shepherd Foundation
- NHMRC Center for Clinical Research Excellence
The significance of asymptomatic knee cartilage defects in healthy individuals is not known. The aim of this study was to examine the association between cartilage defects in the knee and cartilage volume both cross-sectionally and longitudinally in healthy, middle-age adults.
Eighty-six healthy men and women (mean ± SD age 53.8 ± 8.8 years) underwent T1-weighted fat-suppressed magnetic resonance imaging of their dominant knees at baseline and at the 2-year followup visit. Knee cartilage volume was measured. Cartilage defects were scored according to a grading system (0–4) and as present (a defect score of ≥2) or absent in the medial and lateral tibiofemoral compartments.
Cartilage defects in the medial and lateral tibiofemoral compartments were very common (in 61% and 43% of subjects, respectively). Those with cartilage defects had a 25% reduction in medial tibial cartilage volume, a 15% reduction in lateral tibial cartilage volume, and a 19% reduction in total femoral cartilage volume relative to those with no cartilage defects in cross-sectional analyses (all P < 0.05). In the medial tibiofemoral compartment, the annual loss of tibial cartilage in those with cartilage defects was 2.5% (95% confidence interval [95% CI] 2.2%, 3.1%) compared with an annual loss of tibial cartilage of 1.3% (95% CI 0.5%, 2.0%) in those with no defects (P = 0.028), independent of other known risk factors for osteoarthritis (OA).
These data suggest that the presence of asymptomatic, non–full-thickness medial tibiofemoral cartilage defects identifies healthy individuals most likely to lose knee cartilage in the absence of radiographic knee OA. Thus, interventions aimed at reducing or reversing cartilage defects may reduce the risk of subsequent knee OA.