Factors Predictive of Outcomes in Vertebral Body Stapling for Idiopathic Scoliosis.

ABSTRACT

STUDY DESIGN: Retrospective review. OBJECTIVES: To identify factors associated with successful outcomes in patients treated with vertebral body stapling (VBS) for idiopathic scoliosis. SUMMARY OF BACKGROUND DATA The standard of care for moderate scoliosis (20°-45°) consists of observation and bracing with the goal of halting curve progression. Although several recent studies have confirmed the efficacy of bracing in altering the natural history of scoliosis, bracing is not universally effective. Recent studies have demonstrated that VBS is a safe and viable treatment for some young patients with scoliosis at risk for progression. The identification of factors associated with successful outcomes in VBS for idiopathic scoliosis would better define the population likely to benefit from VBS. METHODS: We retrospectively reviewed all patients from a single institution treated with VBS who met previously defined inclusion criteria. Successful treatment was defined as avoidance of a fusion and a final Cobb angle no more than 10° greater than the pretreatment Cobb angle. RESULTS: We identified 63 patients who met inclusion criteria. The patients underwent VBS at a mean age of 10.78 years and had a mean follow-up of 3.62 years (minimum 2 years). The mean pre-op Cobb angle for stapled thoracic curves was 29.5°. Seventy-four percent of the patients who had VBS of the thoracic curve have avoided progression and/or fusion, and the mean Cobb angle at most recent follow-up was 21.8°. The mean preoperative Cobb angle for lumbar curves was 31.1°. Eighty-two percent of the patients who had VBS of the lumbar curve have avoided progression and/or fusion, and their mean Cobb angle at follow-up was 21.6°. CONCLUSION: VBS is effective at preventing progression and fusion for moderate idiopathic scoliosis in immature patients. The complication rates are low.