Fig. 2From: Treatment of ankylosing spondylitis complicated with a thoracolumbar Andersson lesion by posterior closed osteotomy, debridement and fusion through the fracture lineA 58-year-old male patient, diagnosed with AS combined with T11/12 AL. a Preoperative full length anteroposterior radiograph of spine. b Preoperative lateral spinal radiographs showed excessive thoracic kyphosis and a T11/12 intervertebral fracture line (white arrow). c Preoperative CT sagittal view showed T11/12 intervertebral space involving a three-column fracture and a visible vacuum sign (white arrow). d, e Preoperative gross image showing severe kyphosis of the spine with abdominal wall wrinkles (white arrow); f Full length anteroposterior radiographs of the spine 12 months after surgery. g Full length lateral spinal radiographs 12 months after surgery showed normal thoracic kyphosis. h Sagittal CT images at 12 months postoperatively showed intervertebral fusion with the bone graft. i, j Postoperative gross radiography showed normal physiological curvature of the thoracolumbar spine, and the appearance was significantly improvedBack to article page