Concentrations (μg ml−1) and ratios in synovial fluid (diluted or undiluted) or aggrecan and COMP in the different groups
| Median aggrecan concentration (range) | Median COMP concentration (range) | Ratio aggrecan/COMP concentrations | |
| Chronic knee pain with OA (n=45, diluted fluid) | 6.9 (2.0–34.4) | 7.6 (1.8–118.6) | 0.8 (0.1–2.5) |
| Chronic knee pain without OA (n=45, diluted fluid) | 4.8 (2.0–47.6) | 7.6 (1.9–142.0) | 0.5 (0.1–1.5) |
| Healthy controls (n=8, undiluted fluid) | 33.4 (3.5–89.3) | 51.2 (11.6–148.8) | 0.4 (0.1–1.2) |
OA, osteoarthritis.