Figure 1

Workflow of OSE technique performed in patients with TOLF. (A,B) Confirmation of target segment and marking incision on the skin. (C) Endoscope and surgical instruments split but locate in the same incision. (D) Using microscopic drill to remove the ossification lesion layer by layer. (E) Using nucleus pulposus forceps to remove the ossification in one piece. (F) A piece of ossification lesion. (G) Complete decompression of spinal cord with good dural pulsation. (H) Minimally invasive incision approximately 1.5–2 cm.