Spine surgery in patients with ankylosing spondylitis.

INTRODUCTION

Ankylosing spondylitis (AS) is an idiopathic seronegative spondyloartropathy that involves mainly the axial skeleton and the sacroiliac joints. AS promotes biomechanical changes in the spine that predispose to fractures, spinal deformity and spondylodiscitis. The aim of this article is to report the clinical and laboratorial characteristics of patients with AS who underwent spinal surgery at our Institution.

METHODS

Retrospective review of medical charts of patients who had AS and underwent spinal interventions.

RESULTS

Nine patients were found and eight were included in the present study. There were three men and six women and the patients' mean age was 57 years old. All patients had pain at the involved spinal level and one patient had tetraparesis due to cervical myelopathy. Acute-phase proteins were positive in six patients (75%), and HLA-B27 was found in two patients (25%). Four patients had the radiological diagnosis of spondylodiscitis (50%) and underwent a spinal disc biopsy. They were all characterized as having aseptic spondylodiscitis. Three patients were free of pain with analgesics in their last follow-up and one patient had only partial solution of his pain. Three additional patients had spinal fractures surgically treated (37.5%) and one patient was operated because of a cervical kyphotic deformity (12.5%). There were no deaths or surgical complications in this series.

CONCLUSIONS

the majority of our clinical and laboratories findings were discrepant with the medical literature. These differences may be secondary to regional characteristics or by the fact that our population included only those patients who underwent spinal surgery.