Knowledge of the evolution of sperm parameters and risk factors of its degradation over time must answer with the criteria of "evidence based medicine" the request of sperm cryopreservation frequently expressed by SCI patients. This study should lead to the optimization of the management of infertility in patients with spinal cord injuries and giving directions for research aiming to prevent the degradation of sperm parameters. Finally, this study should provide the rationale for future research on clinical risk factors and / or biological degradation of sperm and biological markers of risk of degradation.