{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,16]],"date-time":"2026-03-16T01:06:12Z","timestamp":1773623172165,"version":"3.50.1"},"reference-count":54,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2007,2,22]],"date-time":"2007-02-22T00:00:00Z","timestamp":1172102400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal Orthopaedic Research"],"published-print":{"date-parts":[[2007,6]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>It has been suggested that patients with knee post\u2010traumatic arthritis (PA), associated or not to haemarthrosis (HA), display altered oxidant and anti\u2010oxidant systems in their synovial fluid. This study aimed to establish whether this is really the case. Synovial fluid samples were obtained by transdermal arthrocentesis from 69 patients with PA (36 of them had HA) and 22 control subjects. The activities of synovial fluid zinc\u2010copper superoxide dismutase (ZnCuSOD) and manganese superoxide dismutase (MnSOD) isoenzymes, catalase (CAT), glutathione peroxidase (GPX), glutathione reductase (GR) and glutathione\u2010S\u2010transferase (GST) enzymes, and malondialdehyde (MDA) concentration and synovial fluid viscosity were measured in the study groups. Patients with PA had significantly increased activities of all antioxidant enzymes, except CAT, and MDA concentration than did the controls. However, synovial fluid viscosity was found to be decreased in the study group, mainly in the HA subgroup. Results suggest that excessive free radicals production may exist in synovial fluid of PA patients and may contribute to knee joint destruction. \u00a9 2006 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. 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