Fig. 1

Levels of ECs measured in SFs from contralateral (white histograms) and OA (black histograms) joints. Data are expressed as pmol/mg of lipid extract (a) or pmol/ml of SF (b) and are reported as arithmetic mean ± SEM. Differences were compared by the Student’s t test and asterisks indicate significant differences (OA vs healthy joints; p < 0.05)