Fig. 3

The C-arm fluoroscopy showed that the Kirschner wire was located in the middle of the lower edge of the lesion, and the lateral direction was oblique to the posterior upper edge of the lower vertebral body at the lesion site (A, B); The bone channel is established with the assistance of the C-arm using the ring perimeter (C); The working trocar is installed and the endoscopic operating system is placed (D); The dural sac is visible after decompression (E); The incision is sutured (F)