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Fig. 4 | BMC Surgery

Fig. 4

From: A novel technique of transpedicular opening-wedge osteotomy for treatment of rigid kyphosis in patients with ankylosing spondylitis

Fig. 4

A 36-year-old male patient with thoracolumbar kyphosis secondary to ankylosing spondylitis. a and b Thoracic kyphosis (TK), lumbar lordosis (LL), thoracolumbar kyphosis (TLK), sagittal vertical axis (SVA), height of the middle column (MC) and anterior column (AC) were 43°, 14.9°, 30.3°, 132 mm, 31.2 mm and 27.6 mm, respectively, before surgery. c and d One week after surgery, the TK, TLK and SVA decreased to 41°, 2.9° and 30 mm, respectively, the LL and height of AC increased to 39.2° and 43.4 mm, respectively, and the height of MC was 30.8 mm, which was similar to the preoperative value. e and f At the 4-month and 2-year follow-ups, the improved values were adequately maintained, and the heights of the AC were 43.1 mm and 42.6 mm, respectively; at the 2-year follow-up, new bone formation could be observed between the gaps of open wedged vertebrae, which implied that bone union was achieved

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