✓Testicular torsion and ischemia-reperfusion syndrome were examined on the ipsilatcral and contralateral testi. 50 adult rats in five groups were established. The effect of two hours, 1080° unilateral testicular torsion and detorsion on the bilateral testicular tissue were evaluated by histological examination besides tissue xanthine oxidase activity and malondialdehyde, a lipid peroxidation product. Testicular torsion and reperfusion caused significant ischemia (p