The epidural fibrous sheath: a guide for the replacement of a spinal cord stimulation electrode.

Background And Objective: During spinal cord stimulation there is sometimes a need to replace defective leads. Percutaneous lead replacement by recannulating the epidural space and "steering" the new lead to the prior location is sometimes very difficult, resulting in diminished analgesia. Since fibrous deposits are known to form around epidural catheters and epidural obstructions have been noted with other techniques, we have inserted the new lead through the well-dissected opening in the interspinal ligament.