Study on Preliminary Safety and Efficacy of the ARC-IM Therapy to Alleviate Locomotor Deficits in People With Parkinson's Disease

This study is testing the ARC-IM therapy — an implanted spinal cord stimulation device that delivers targeted electrical pulses to improve walking — in people with Parkinson's disease who have significant gait problems such as freezing of gait (suddenly being unable to move the feet) or postural instability (balance problems), despite optimal medication. **You may be eligible if...** - You have typical Parkinson's disease (Hoehn-Yahr stage II–IV) on standard therapy - You have debilitating walking problems (freezing of gait or postural instability) that are not well controlled by medication - You are 18 or older - You can communicate with the study team in French or English **You may NOT be eligible if...** - You have an atypical form of parkinsonism (such as Multiple System Atrophy or Progressive Supranuclear Palsy) - You have significant dementia or psychiatric conditions that would prevent participation - You have a pacemaker, cochlear implant, or other implanted device that could interfere with stimulation - You are pregnant Talk to your doctor to see if this trial is right for you.