Fig. 4

The cases for the surgical strategy for four types of DTLK. (A-B) Type I: A 61-year-old female with SVA of -7.3 mm and TLK of 20.5, she was performed L4-5 PLIF with the change of ODI of 33 at the 13-month follow up; (C-D) Type II: A 76-year-old male with SVA of 32.5 mm and TLK of 44.9, he was performed L2-5 PLIF&PLF with the change of ODI of 38 at the 15.5-month follow up; (E-F) Type III: A 65-year-old female with SVA of 73.9 mm and TLK of 20.6, she was performed L1-5 PLIF&PLF with the change of ODI of 28 at the 16-month follow up; (H-I) Type IV: A 69-year-old male with SVA of 96 mm and TLK of 64.2, he was performed T10-L5 PLIF&PLF with the change of ODI of 40 at the 13-month follow up