Objective:　Nucleoplasty, using YES-disc®, is a minimally invasive procedure used to decompress herniated discs. Reviews to date recommend nucleoplasty for treating chronic back pain, although with the restriction of limited to fair evidence.
The purpose of this study was to evaluate long-term efficacy over 6 month follow-up of nucleoplasty treatment for chronic low back pain.

Method : We performed Neucleoplasty using Yesdisc® in 233 Patients who visited our clinic addressing chronic low back pain. 216 patients were followed up to 6 month.
Mean age of all patients was 47. 155 patients were treated with one level disc, 77 patients were treated with two level disc, 1 patient was treated with three level disc. Patients were asked to show their VAS score on pre-op, each 1-week, 4-weeks and 6-months follow-up visits.

Result : Evaluating 217 patients, VAS of back pain was reduced from 8.1 to 2.8 at 6-month\'s visit. For leg radiating pain, VAS changed from 7.1 to 2.7.
14 patients could not complete this study due to consisting pain. Complications occurred in three patients. (2 patients developed infection after the procedure and the catheter was cut off in one patient).

Conclusion : Neucleoplasty using Yesdisc® appeared to be an effective and safe method for LBP without significant complications and minimal morbidity.
In our study, A significant decrease in both low back pain and leg pain was seen between the preoperative VAS scores and scores after 1-week ,after 1-month and 6-month follow-ups.
This study has several limitation. There were 14 patients who could not complete the study due to consisting pain.