Abstract:Objective A retrospective study was conducted to analyze the effect of Modic change type Ⅱ on the therapeutic effect of lumbar disc herniation (LDH) by percutaneous endoscopic lumbar disc discectomy (PELD).Methods 43 patients suffered LDH with or without Modic change type Ⅱ who were treated from January 2018 to December 2019 were included. All these patients underwent PELD treatment. According to the lumbar MRI, they divided into Modic change group (MC group with 23 patients) and pure LDH group (control group with 20 patients). Visual analogue scale (VAS) of lumbar and legs, Japanese Orthopedics Association (JOA) scores and lumbar Oswestry disability index (ODI) were recorded before surgery and during follow-up respectively.Results Operation time, surgical bleeding, pre-operative lumber VAS score, pre-operative and post-operative leg VAS score, pre-operative JOA score and ODI of both two groups has no statistic difference (P > 0.05). However, back pain VAS score of MC group was higher than control group at 3 days, 3 months and 6 months after surgery (P < 0.01). Meanwhile, JOA score of MC group was lower than that in the control group (P < 0.01), and ODI of MC group was higher than that in the control group at 3 months and 6 months after surgery (P < 0.01). Compared with pre-operation, all the indication of the two groups was improved (P < 0.05).Conclusion PELD had excellent clinical outcome for patients who suffered with LDH with Modic change type Ⅱ, and was a safe and reliable clinical technique. However, Modic change can affect the relieve of postoperative back pain. When treated with such patients, comprehensive considerations should be taken into account.