Background:This study evaluated the efficacy of percutaneous nucleoplasty using coblation technique for the treatment of chronic nonspecific low back pain (LBP),after 5 years of follow-up.Methods:From September 2004 to November 2006,172 patients underwent percutaneous nucleoplasty for chronic LBP in our department.Forty-one of these patients were followed up for a mean period of 67 months.Nucleoplasty was performed at L3/4 in 1 patient;L4/5 in 25 patients;L5/S1 in 2 patients;L3/4 and L4/5 in 2 patients;L4/5 and L5/S1 in 7 patients;and L3/4,L4/5,and L5/S1 in 4 patients.Patients were assessed preoperatively and at 1 week,1 year,3 years,and 5 years postoperatively.Pain was graded using a 10-cm Visual Analogue Scale (VAS) and the percentage reduction in pain score was calculated at each postoperative time point.The Oswestry Disability Index (ODI) was used to assess disability-related to lumbar spine degeneration,and patient satisfaction was assessed using the modified MacNab criteria.Results:There were significant differences among the preoperative,1-week postoperative,and 3-year postoperative VAS and ODI scores,but not between the 3-and 5-year postoperative scores.There were no significant differences in age,sex,or preoperative symptoms between patients with effective and ineffective treatment,but there were significant differences in the number of levels treated,Pfirrmann grade of intervertebral disc degeneration,and provocative discography findings between these two groups.Excellent or good patient satisfaction was achieved in 87.9％ of patients after 1 week,72.4％ after 1 year,67.7％ after 3 years,and 63.4％ at the last follow-up.Conclusions:Although previously published short-and medium-term outcomes after percutaneous nucleoplasty appeared to be satisfactory,our long-term follow-up results show a significant decline in patient satisfaction over time.Percutaneous nucleoplasty is a safe and simple technique,with therapeutic effectiveness for the treatment of chronic LBP in selected patients.The technique is minimally invasive and can be used as part of a stepwise treatment plan for chronic LBP.