Rates of lead migration and stimulation loss in spinal cord stimulation: A retrospective comparison of laminotomy versus percutaneous implantation

Background: neuromodulation has been used to treat neuropathic pain. leads have beenimplanted using laminotomy or percutaneous approaches. laminotomy implantation has beenshown to be superior in terms of lead migration when compared to percutaneous implantation.lead migration has been reported as high as 68% with the percutaneous approach. because of this,newer anchors have been developed but not tested in vivo.objectives: this study tests the hypothesis that newer anchoring systems have improved leadmigration rates for percutaneous leads relative to laminotomy leads to the point of parity. this studyalso analyzed if factors such as laterality of symptoms,lead type,level of implant and diagnosis affectmigration rates.study design: neurostimulators implanted in the thoracolumbar spine at henry ford hospitalbetween 2006 and 2008 were reviewed for the following: age,sex,diagnosis,lead type,and implantlevel. implants were reviewed for the following: age,sex,diagnosis,lead type,implant level,implantmethod,symptom laterality,loss of stimulation,radiographic lead migration,and time to loss. lossof capture and lead migration in the laminotomy and percutaneous groups were compared usingfisher's exact test. variables within each group included: lead type,level of implantation,location ofsymptoms,and diagnosis. they were compared using fisher's exact test. time to loss of stimulationwas compared using the wilcoxon 2-sample test.setting: pain clinic,henry ford hospital,detroit,mi.results: laminotomies were performed by a single neurosurgeon and percutaneous implantswere performed by a single pain medicine specialist. percutaneous leads were anchored using titan(medtronic corporation,minneapolis,mn) anchors. loss of capture was 24% laminotomy and 23%percutaneous with no significant difference between the 2 groups (p = 0.787). radiographic evidenceof migration was 13.63% percutaneous and 12.67% laminotomy with no significant difference (p= 0.999). the average days to loss of stimulation for the laminotomy versus percutaneous were asfollows: 124.82 and 323.6 which were not statistically significant. there was no statistical differencein the days to loss of capture between the groups (p = 0.060). there was no significant differencebetween unilateral or bilateral symptoms in loss of capture within either group (p = 0.263,p = 0.326).there was not enough data to do comparisons by diagnosis. comparisons of loss of capture based onelectrode type was not significant in either group (p = 0.687,p = 0.371). the effect of the spinal levelon the lack of recapture rates was not able to be calculated due to the number of levels.limitations: retrospective study.conclusion: rates of stimulation loss and radiographic lead migration are similar for bothlaminotomy and percutaneous implantation. time to loss of stimulation was not statistically differentin either group,although there was a trend toward laminotomy leads migrating earlier. lead typeand laterality of symptoms do not affect lead migration rates. the effect of the level of implant anddiagnosis was indeterminate.