Type 3 bone-disc-bone osteotomy (grade 4+ osteotomy) combined with presurgical halo-pelvic traction: a safe and effective solution to correct severe angular-like kyphoscoliosis

Tianyuan Zhang, Wenyuan Sui, Xiexiang Shao, Yaolong Deng, Zifang Huang, Junlin Yang, Jingfan Yang