Table 4.

Mean Values of arginine (ARN), asymmetric dimethylarginine (ADMA), symmetric dimethylarginine (SDMA) and ARNA/ADMA ratio in synovial fluid (synov.f.) and blood plasma of patients with knee osteoarthritis (OA).

	synov.f. N=32	Plasma N=31	P
ARN (μmol/l)	76.96±16.73 (Range: 68.00–91.53)	53.55±16.73 (Range: 21.67–98.25)	P<0.00001
ADMA (μmol/l)	0.75±0.09 (Range: 0.65–0.96)	0.69±0.14 (Range: 0.49–0.93)	P<0.05
SDMA (μmol/l)	0.66±0.10 (Range: 0.55–0.95)	0.69±0.15 (Range: 0.41–1.03)	N.S.
ARN/ADMA	103.37±13.65 (Range: 81.64–127.1)	80.85±29.58 (Range: 34.68–166.5)	P<0.0005