Study of Lower-limb Phantom Pain Syndrome Using Peripheral Nerve and Spinal Cord Stimulation

Inclusion criteria for the study: * Patients with implanted neuromodulation devices. * Amputation of the lower limb. * Age ranges from 18 to 65 years old. * The duration from the moment of amputation is from 12 months. * The presence of persistent chronic pain syndrome is from 4 to 10 points according to the Visual Analogue Scale * Absence of pregnancy at the time of implantation, confirmed by a pregnancy test. Exclusion criteria: * The presence of severe somatic pathology that prevents surgical treatment and participation in the study. * The presence of mental illness (including history), severe depression, suicidal tendencies, history of suicide. * The presence of gross orthopedic deformity in the limb above the amputation level. * History of oncology. * History of epilepsy. * Complicated TBI or history of stroke. * The impossibility of conducting electrical stimulation due to another somatic pathology. * Purulent septic pathology. * Drug addiction (including history). * Congenital malformation of the lower limb. * Anomalies in the development of the CNS. * Any conditions that fall under the exclusion criteria according to the researchers.