Spinal Stimulation and Gait Training to Improve Mobility in TBI

Inclusion Criteria: * Have weakness on at least one side of my body. * No injury to my unaffected side in 6 months. * Be cleared by a physician to participate in this study. * Have had a non-penetrating TBI at least 2 years ago. A non-penetrating injury is an injury where my skull remained closed and no object entered it. * Have enough strength to use a hemiwalker or walker. * Be between 18-65 years of age. * Be medically stable for at least 6 months before enrolling. This means that I have not had an emergency room visit, hospitalization, or medical procedure (such as a surgery) during this period of time. * Able to walk 10 yards with minimal assistance without an ankle-foot orthosis (brace) * Able to respond to and tolerate surface stimulation, as determined by study staff * Have the ability to communicate in English. * Have stable blood pressure. * Be willing and able to give informed consent. * Be able and willing to comply with study procedures, verbal instructions, and follow-up requirements. Exclusion Criteria: * Have must have not had physical or occupational therapy or treatment for a balance disorder within 30 days prior to study enrollment. I must not participate in physical or occupation therapy throughout the duration of the study to avoid affecting the study results. * Have any medical issues that affect my unaffected side (such arthritis, fracture, etc.). * Have skin issues that would prevent me from being able to use the surface stimulation (such as a open wound or rash). * Have a pre-existing condition that may make it difficult for me to participate in exercise. (uncontrolled hypertension as described by a physician, heart disease, abnormal heart rate or rhythm, or congestive heart failure). * Have been hospitalized for heart attack, heart surgery or acute heart failure within 3 months of enrollment in study. * Have an implanted medical or metallic device. * Reduced sensation in my lower limbs and stimulation locations. * Have Botox injections in my legs up to 3 months prior to enrolling. * Have physical therapy for walking. * Have uncontrolled seizure disorder (such as epilepsy) * Have nervous system-related issues (for example Parkinson's disease, multiple sclerosis). * Major changes to my medications throughout the study * Have bone or muscle issues unrelated to traumatic brain injury that interfere with my walking or limit my range of motion in my legs. * Be currently pregnant. Because of potential risk to the fetus, women of child bearing potential will be required to have a pregnancy test before they can enroll in this study. If I am female, and have a positive pregnancy test, I will not be enrolled. * Have any other medical conditions that my doctor or physical therapist feels would affect my ability to use the stimulation or participate in walking training TMS Specific - Exclusion (those with these exclusions can still participate in other parts of the study) * I have a history of seizure disorder or have a close family member (parent, brother, sister, or child) who has a seizure disorder. * I have had unexplained fainting spells. * I have had an active migraine headaches. * I have a past or current history of ringing in the ears (tinnitus) or severe hearing problems. * I am currently taking or withdrawing from any medication that would increase my risk of seizure (determination made in consultation with study physician). * I have a history of alcohol or drug abuse in the prior 3 years. * I have nerve damage outside of my brain or spinal cord (such as in an arm or leg). * I am unwilling to participate in TMS.