Shi H, Zhu L, Li Jiang Z, et al. - In this study, radiological risk factors for recurrent lumbar disc herniation (rLDH) after percutaneous transforaminal endoscopic discectomy (PTED) were explored. Between January 2013 and May 2019, individuals who had undergone PTED due to a single-level L4-L5 or L5-S1 disc herniation were included in this study. Researchers performed a matched case-control design in a single institution. They further compared radiological parameters between the two groups. Via univariate and multivariate logistic regression analysis, the radiological risk factors for rLDH after PTED were distinguished. The study enrolled a sum of 2,186 patients who had undergone PTED at L4-L5 or L5-S1 level. The outcomes exhibited that a low grade of surgical-level disc degeneration, senior grade of adjacent-level disc degeneration, a high disc height index, and a large sagittal range of motion were the radiological independent risk factors for rLDH after PTED.