Lithium, Cord Blood Cells and the Combination in the Treatment of Acute & Sub-acute Spinal Cord Injury

Inclusion Criteria: * either gender and 18-65 years old; * acute or subacute traumatic spinal cord injury (defined as SCI resulting from an exteneral non-penetrating cause that occurred within 4 weeks); * neurological status of ASIA A; * neurological level between C5-T11; * MRI shows injury site is within 3 vertebral level and necrotic focus, if exist, is less than 1/3 of the spinal cord diameter; * professional judgment determinate that subjects need a spinal decompression surgery; * subjects able to complete neurological examination; * subjects have voluntarily signed and dated an informed consent form. Exclusion Criteria: * penetration SCI such as gun-shoot, knife-cutting or SCI caused by non-traumatic conditions; * spinal cord lesion exceeds three segments or necrotic focus with diameter larger than 1/3 of the spinal cord; * severe complications; * significant medical diseases or infection; * pregnant or lactating woman, or female of childbearing potential and who is unwilling to use an effective contraceptive method while enrolled in the study; * unavailability of suitable umbilical cord blood cells; * contraindication of lithium carbonate and/or spinal decompression surgery * subject is currently participating in another study or has been taking any investigational drug within the last 4 weeks prior to screening; * investigator suggests that the subject would not be suitable to participate this study