Abstract:Objective To compare the mid -term clinical efficacy between percutaneous endoscopic interlaminar discectomy (PEID) and micro-endoscopic discectomy (MED) in L5/S1 intervertebral disc resection. Methods A total of 90 patients who underwent L5/S1 intervertebral resection in our hospital from April 2014 to July 2016 were included and randomly divided into control group (45 patients received MED) and observation group (45 patients received PEID). Surgical related parameters were compared. Results Operation time, incision size and average hospitalization time in the observation group were significantly lower than those in the control group (P < 0.05). The waist and leg pain VAS scores were compared between the control group and the observation group before operation and 3 d, 30 d, half a year and one year after surgery. There was a significant difference at each time point in the waist and leg pain VAS scores ( F= 11.587,P = 0.000;F =15.664,P = 0.000, respectively); there was a significant difference between the control group and the observation group in the waist and leg pain VAS scores ( F= 15.368,P = 0.000;F = 9.865,P =0.000,respectively); Q test showed that the waist and leg pain VAS scores of the control group were significantly higher than those of the observation group. There was a significant difference in the changing trend of the waist and leg pain VAS scores between the control group and observation group (F = 11.615,P = 0.000;F =18.334, P= 0.000, respectively). There was significant difference in clinical efficacy one year after surgery between the control group and the observation group (Z = 3.691,P = 0.000). The control group had a better clinical efficacy than the observation group. There were 5 cases in the control group and 4 cases in the observation group that experienced adverse events but the difference was not statistically significant (x2 =0.123,P = 0.725). Conclusions The mid-term clinical efficacy of PEID is better than that of MED in the L5 / S1 intervertebral disc resection, but these two surgical methods have a similar variation tendency in the longterm outcome. We suggest a comprehensive consideration of patients' condition and imaging data before surgery to ensure the proper surgical methods.