Pedicle screw placement accuracy in robot-assisted versus image-guided freehand surgery of thoraco-lumbar spine (ROBARTHRODESE): study protocol for a single-centre randomized controlled trial

机器人辅助与图像引导徒手胸腰椎手术中椎弓根螺钉置入精度比较（ROBARTHRODESE）：单中心随机对照试验研究方案