Guangdong Provincial Center for Engineering and Technology Research of Minimally Invasive Spine Surgery 1 article published in JoVE Medicine The Third Channel-Assisted Unilateral Biportal Endoscopic Technique for Lumbar Spinal Stenosis Combined with Contralateral Disc Herniation Lixian Tan1,2,3, Runmin Tang1,2,3, Limin Rong1,2,3, Liangming Zhang1,2,3 1Department of Spine Surgery, The Third Affiliated Hospital of Sun Yat-sen University, 2Guangdong Provincial Center for Quality Control of Minimally Invasive Spine Surgery, 3Guangdong Provincial Center for Engineering and Technology Research of Minimally Invasive Spine Surgery Here, we present the third channel-assisted UBE technique, which allows for the vertical removal of herniated disc fragments. This technique can effectively address the limitations of traditional UBE techniques. This article will systematically elaborate on this procedure.