Study on Preliminary Safety and Efficacy of the ARC Therapy Using the ARC-IM Lumbar System to Support Mobility in People With Chronic Spinal Cord Injury (BoxSwitch)

Inclusion Criteria: 1. Implanted with a spinal array (Specify 5-6-5 or Go2 Lead) for lower limb mobility, as confirmed by imaging, videos, or neurophysiology recordings. 2. Age 18-65 3. SCI graded as American Spinal Injury Association Impairment Scale (AIS) A, B, C \& D 4. SCI ≥ 12months 5. SCI lesion level T10 and above with preservation of conus function 6. SCI due to trauma 7. Stable medical, physical and psychological condition as considered by the investigators 8. Able to understand and interact with the study team in French or English 9. Agrees to comply in good faith with all conditions of the study and to attend all scheduled appointments 10. Must provide and sign the Informed Consent prior to any study-related procedures Exclusion Criteria: 1. Diseases and conditions that would increase the morbidity and mortality of spinal cord injury surgery 2. History of myocardial infarction or cerebrovascular event within the past 6 months 3. Limitation of walking function based on accompanying (CNS) disorders (systemic malignant disorders, cardiovascular disorders restricting physical training, peripheral nerve disorders) 4. Any active implanted cardiac device such as pacemaker or defibrillator 5. Any indication that would require diathermy 6. Any indication that would require MRI 7. Any anatomical limitations in the implantation area as judged by the investigators 8. Other conditions that would make the subject unable to participate in testing in the judgement of the investigators 9. Clinically significant mental illness in the judgement of the investigators 10. Presence of indwelling baclofen or insulin pump 11. Other clinically significant concomitant disease states (e.g., renal failure, hepatic dysfunction, cardiovascular disease, etc.) 12. Inability to follow the procedures of the study, e.g. due to language problems, psychological disorders, or dementia of the participant 13. Enrolment of the investigator, his/her family members, employees, and other dependent persons 14. Women who are pregnant (pregnancy test obligatory for women of childbearing potential) or breastfeeding