 The dorsal root or dorsal root ganglion (that carry mostly sensory signals) may be usefully targeted (called rhizotomy); with the dorsal root ganglion possibly the more effective target because some sensory fibers enter the spinal cord from the dorsal root ganglion via the "ventral" (motor) root, and these would not be interrupted by dorsal root neurectomy.Because nerves often carry both sensory and motor fibers, motor impairment is a possible side effect of neurectomy.A common result of this procedure is "deafferentation pain" where, 6–9 months after surgery, pain returns at greater intensity.