Fig. 4
A 58-year-old female DLS patient underwent thoracolumbar fusion surgery (T10–S2). Radiographs show the changes in spinopelvic parameters, preoperative TK, LL, PT, SS, PI, PFA, SAA, SVA and TPA were 16.9°, −16.9°, 27.5°, 4.2°, 31.7°, 197.2°, 51.0°, −4.3 mm and 19°, respectively (A). Postoperatively, those variables were 37.6° for TK, -35.8° for LL, 20° for PT, 15.3° for SS, 35.3° for PI, 193.7° for PFA, 49.2° for SAA, −21.5 mm for SVA, and 14° for TPA (B). The PI–LL postoperatively was -0.5° at the post-operation. The patient has a significant upright posture after the surgery (B); however, PJF developed at the 18th month during follow-up (C)