[Treatment of spinal fractures complicating ankylosing spondylitis].

OBJECTIVE: To study the treatment of spinal fractures in ankylosing spondylitis.

METHODS: Nineteen cases of spinal fractures complicating ankylosing spondylitis admitted in our hospital were studied retrospectively.

RESULTS: All of 19 cases were up to the diagnosis standards of ankylosing spondylitis. Eleven patients had cervical fracture and 8 had thoracolumbar fracture. Of the patients with cervical fracture, fractures occurred at C(5 - 7) in 9 patients. Of the patients with thoracolumbar injury, stress fractures were seen in 7 patients and all of seven fractures occurred at T(10)-L(2). Sixteen of the 19 patients sustained fractures through three columns of the spine. Nine patients had spinal cord injures; eight of the 9 cases had cervical fracture. All of the 19 patients were treated operatively. Four different surgical procedures were used in patients with cervical fracture; decompression, fusion and stabilization with instrumentation by anterior approach were performed in 9 patients. Of the patients with thoracolumbar fractures, four different operations were performed; fusion by both anterior and posterior approach plus a long posterior instrument were used in 5 cases. Eighteen patients had an average follow-up period of 46.6 months. Nine patients with preoperative neurological deficits improved in 8 and was stabilized in 1. Radiographic evidence of fusion was observed in all of the 18 patients. Two patients suffered neurological deterioration during surgery. One patient died from cerebrovascular infarction. Two patients had pneumonia after the operative procedure.

CONCLUSIONS: Spinal fractures in ankylosing spondylitis are associated with a high rate of neurological injury. Shearing fracture usually occurs at the lower cervical spine (C(5 - 7)) and stress fracture at thoracolumbar spine. Most of the fractures involve three columns of spine. Surgical intervention may be indicated in this injury. Fracture union and neurological improvement can be achieved in most patients treated by operation. We suggest that, fusion and stabilization with instrumentation by anterior approach is indicated in most cervical shearing fracture, and a combined fusion by both sides plus a long posterior instrument is probably beneficial in patients with thoracolumbar stress fracture. Complications is not rare after surgery and appropriate preventive measures are necessary for these patients.