Correction of post-traumatic thoracolumbar kyphosis using pedicle subtraction osteotomy.

The aim of this study was to retrospectively analyze and evaluate the effect of treatment employing pedicle subtraction osteotomy for chronic, posttraumatic thoracolumbar kyphosis. This study included 19 patients, 11 males and 8 females, with chronic, posttraumatic thoracolumbar kyphosis. Pre-operative kyphosis ranged from 31° to 63°. The history of trauma ranged from 8 to 63 months. All patients were treated with pedicle subtraction osteotomy. A mean 40.2° improvement in sagittal alignment was achieved with a mean correction rate of 85.8 %. Perioperative complications were encountered in two patients, one with cerebrospinal fluid leakage followed by encephalitic infection and one with a wound infection. Both were treated conservatively with antibiotics and local wound care. There were no other severe complications. The average follow-up period was 15 months (range 6-41 months). At the last follow-up, clinical symptoms and neurological function were significantly improved. Of 14 patients presenting with intractable back pain, VAS scores improved from a preoperative mean of 6.7 (range 5.0-8.0) to an average 2.0 (range 0-3.0) at final follow-up. No significant loss of correction was observed (loss of 1.7°), and solid fusion was achieved in all 19 patients. A single-stage posterior pedicle subtraction osteotomy is a safe and effective procedure for correction of posttraumatic thoracolumbar kyphosis. Using this technique, it is possible to safely obtain no greater than 55° of correction at a single level.