Fig. 2From: Reducing surgical levels by paraspinal mapping and diffusion tensor imaging techniques in lumbar spinal stenosisFibrillation potentials in denervated muscle. Grades of activity: 1+, fibrillation potentials persistent in at least two areas; 2+, moderate number of persistent fibrillation potentials in three or more areas; 3+, large number of persistent discharges in all areas; 4+, profuse, widespread, persistent discharges that fill the baseline [53]Back to article page