Fig. 8.

A 64-year-old female patient with lumbar degenerative kyphosis. (A) In preoperative whole-spine standing lateral position, the LL was −14° (kyphosis). (B) After oblique lumbar interbody fusion (L2–3, L3–4, L4–5), the LL was corrected to 24°, in the postoperative supine lateral position. Considering the pelvic incidence minus LL, the required additional lordosis correction angle was about 30°. Hence, we performed pedicle subtraction osteotomy at L3 after 1 week. (C) Postoperative whole-spine standing anteroposterior and (D) lateral were taken 2 weeks after the second staged operation. LL, lumbar lordosis; SS, sacral slope; PT, pelvic tilt; PI, pelvic incidence.