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Spinal cord injury (SCI) is a very destructive process for both the patients and the society. Lipid peroxidation is the main cause of the further secondary damages which starts after mechanical destruction of tissues. Recent studies have shown that erythropoietin (EPO) has neuroprotective properties. In this study, we aimed to see the effect of EPO treatment after spinal cord injury on the oxidant and anti-oxidant enzyme systems and the relationship with the N-methyl-d-Aspartate (NMDA) blockage. Spinal cord injury was produced by epidural compression with a cerebral vascular clip that has a closing force of 40g for 30s after a limited multilevel laminectomy (T9-11). Experiment was done in 5 groups: Group1: Sham-operated untraumatised, Group 2: SCI untreated, Group 3: 150i.u./kg EPO injected i.p. at the end of the first hour following the trauma. Group 4: NMDA receptor antagonist ketamine (100mg/kg) i.p. Group 5 …