Fig. 1

A case of 64-year old female, who underwent L4-L5 instrumented fusion. a Preoperative standing knee AP radiograph shows mild (KLG 1) knee OA. Whole spine standing lateral radiographs taken at b the preoperative, c the postoperative 1 month, and d the postoperative 3-year follow-up show the stable maintenance of postoperatively achieved improvement in radiographic sagittal balance