Fig. 2
A 69-year-old female with severe back pain (VAS score of 7) due to L1 post-traumatic kyphosis. a. The X-rays showed L1 old compression fracture, RKA was 32.70. b. the patient underwent Schwab grade 4 osteotomy and internal fixation in traditional method. c. Postoperative X-ray (2-year follow-up) showed satisfactory correction with RKA of 120