Abstract: Objective  To explore the effects of transforaminal endoscopic spine system(TESSYS) technique under percutaneous foraminal endoscopy on structure parameters of the lumbar vertebra and motor function of patients with lumbar disc herniation(LDH). 
Methods  A retrospective analysis was performed on the clinical data of 50 patients with LDH. The patients were divided into control group(n=25) and observation group(n=25) according to different treatment methods. The observation group was treated using percutaneous transforaminal endoscopy TESSYS, and the control group was treated using intervertebral disc endoscope. Perioperative related indexes, structure parameters of lumbar vertebrae, motor function and postoperative complications were compared between two groups. 
Results  The intraoperative blood loss, length of incision, first ambulation and length of hospital stay of the observation group were less or shorter than those of the control group(P＜0.05). There was no significant difference in duration of operation between two groups(P＞0.05). At 6 months after operation, lumbosacral angle of the two groups was smaller than that before operation; L5/S1 zygapophysial joint angle, L2-3 zygapophysial joint angle, L3-4 zygapophysial joint angle, L4-5 zygapophysial joint angle or lumbar curvature were larger than those before treatment; lumbosacral angle was smaller in the observation group than in the control group, while L5/S1 zygapophysial joint angle, L2-3 zygapophysial joint angle, L3-4 zygapophysial joint angle, L4-5 zygapophysial joint angle or lumbar curvature were larger in the observation group than in the control group(P＜0.05). At 1 month after operation, Oswestry disability index(ODI) score was lower than that before operation, while Japanese Orthopaedic Association(JOA) score was higher than that before operation; the ODI score of the observation group was lower than that of the control group and the JOA score was higher than that of the control group at 1 month after operation(P＜0.05). There was no significant difference in the incidence of complications between two groups(P＞0.05). 
Conclusion  Percutaneous foraminal endoscopy TESSYS for treating patients with LDH had characteristics of smaller surgical incision, less intraoperative blood loss and faster postoperative recovery. It can significantly relieve the patient′s symptoms, with high safety.

Key words: intervertebral disc displacement, percutaneous foraminal endoscopy TESSYS, structure parameters of lumbar vertebrae, motor function