Fig. 2

The operation process of ultrasonic bone curette MIS-TLIF technique. A The ultrasonic bone curette was used to remove the vertebral plate and part of the inferior articular process. B The ultrasonic bone curette was used to remove the whole inferior articular process, the part of the superior articular process,spinous process root and ipsilateral ligamentum flavum,fully exposed the ipsilateral outlet root and the running root. C The ultrasonic bone curette was utilized to remove the contralateral lamina,the lamina rongeur was employed to remove the contralateral ligamentum flavum,while the ultrasonic bone curette(spherical knife head) was used to expand the contralateral nerve root canal and lateral recess, and the contralateral nerve root was fully released. D The bilateral nerve roots were completely released and bone graft was performed. The interbody fusion cage was inserted