High-voltage electrical burns are rare, but the functional prognosis is often disastrous. Electrical currents are responsible for a wide range of injuries and their clinical assessment is difficult. For a case of severe electrical burn, and based on the literature, the authors performed an early MRI to elaborate their surgical strategy and avoid multiple surgeries by determining the level of amputation. Analysis of the different MRI signals and the per-operative study of the tissues led the team to take an early surgical approach and we were able to determine the level of limb amputation. Early analysis of lesions by MRI imaging allows us to consider a more aggressive surgical approach and thus reduce the number of interventions and the duration of stay in the intensive care unit.